VAL Digest V2 #236

VAL Digest            Tuesday, May 3 2005            Volume 02 : Number 236




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Topics in Today's Digest:

RE: [VAL] Tires
RE: [VAL] Tires
RE: [VAL] Tires
Re: [VAL] ebay item
Re: [VAL] tire pump
Re: [VAL] pump/tires
Re: [VAL] Tires
Re: [VAL] New Argosy
RE: [VAL] Tires
Re: [VAL] Tires
RE: [VAL] Tires
Re: [VAL] pump/tires
Re: [VAL] Tires
Re: [VAL] tire pump
Re: [VAL] re-keying
RE: [VAL] Tires
Re: [VAL] Tires
Re: [VAL] Tires
Re: [VAL] pump/tires
Re: [VAL] tire pump
[VAL] CEILING LIGHT COVER
RE: [VAL] Tires
RE: [VAL] Tires
Re: [VAL] Tires
RE: [VAL] Tires
RE: [VAL] Tires
RE: [VAL] Tires
RE: [VAL] Tires
RE: [VAL] Tires
RE: [VAL] Tires
Re: [VAL] Tires
RE: [VAL] Tires
[VAL] '66 Caravel electric issues
Re: [VAL] '66 Caravel electric issues
Re: [VAL] Tires
RE: [VAL] Tires
Re: [VAL] tire pump

----------------------------------------------------------------------

Date: Sun, 1 May 2005 23:00:00 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

Dave,

Perhaps someone on the list will correct me if I am wrong, but if your E
rated tires are rated at 3060 lbs. per tire (at 95 psi) that would give you
a load capacity of 6,120 lbs. which likely exceeds your single axle load
capacity by about 2,000 lbs. So, as I said earlier, E rated is way more than
you need and will likely cause you other problems.

For an example, to give you some contrast, I have a '66 20 ft. Globe Trotter
that weighs about 3,500 lbs loaded. I use load range D tires on its single
axle. The tires are rated at 2,040 lbs (per tire) with 60 psi. If I put 60
psi in these tires they track and wear poorly because they would be
pressurized to carry 580 lbs more than the trailer weighs. You want to match
the weight of your trailer to what the load capacity of the tire is at a
given pressure. Check the Goodyear tire web site at
http://www.goodyear.com/rv/tirecare/loadinflationtables.html. They have a
chart you can study to help you get your tire pressure in the ball park
where it needs to be for the best combination of tracking, wear and ride.

Forrest

> -----Original Message-----
> From: valist-admin@xxxxxxxxxx.com
> [mailto:valist-admin@xxxxxxxxxx.com]On Behalf Of DAVID GRYVNAK
> Sent: Sunday, May 01, 2005 12:44 AM
> To: valist@xxxxxxxxxx.com
> Subject: RE: [VAL] Tires
>
>
> Forrest,  The E rated tires I have seen have a rating of 3060 #
> when they are pressurezed to 95#
>
> ;Dave Gryvnak,  GryvnakD@xxxxxxxxxx.com

------------------------------

Date: Sun, 1 May 2005 22:42:12 -0700 (PDT)
From: DAVID GRYVNAK <gryvnakd@xxxxxxxxxx.com>
Subject: RE: [VAL] Tires

Forrest, my trailer weight is 4900#.  that is why I want to go to something 
better than D rated tires.  they are too marginal.
 
Dave Gryvnak, GryvnakD@xxxxxxxxxx.com

Forrest McClure <forrest@xxxxxxxxxx.org> wrote:
Dave,

Perhaps someone on the list will correct me if I am wrong, but if your E
rated tires are rated at 3060 lbs. per tire (at 95 psi) that would give you
a load capacity of 6,120 lbs. which likely exceeds your single axle load
capacity by about 2,000 lbs. So, as I said earlier, E rated is way more than
you need and will likely cause you other problems.

For an example, to give you some contrast, I have a '66 20 ft. Globe Trotter
that weighs about 3,500 lbs loaded. I use load range D tires on its single
axle. The tires are rated at 2,040 lbs (per tire) with 60 psi. If I put 60
psi in these tires they track and wear poorly because they would be
pressurized to carry 580 lbs more than the trailer weighs. You want to match
the weight of your trailer to what the load capacity of the tire is at a
given pressure. Check the Goodyear tire web site at
http://www.goodyear.com/rv/tirecare/loadinflationtables.html. They have a
chart you can study to help you get your tire pressure in the ball park
where it needs to be for the best combination of tracking, wear and ride.

Forrest

> -----Original Message-----
> From: valist-admin@xxxxxxxxxx.com
> [mailto:valist-admin@xxxxxxxxxx.com]On Behalf Of DAVID GRYVNAK
> Sent: Sunday, May 01, 2005 12:44 AM
> To: valist@xxxxxxxxxx.com
> Subject: RE: [VAL] Tires
>
>
> Forrest, The E rated tires I have seen have a rating of 3060 #
> when they are pressurezed to 95#
>
> ;Dave Gryvnak, GryvnakD@xxxxxxxxxx.com





  Dave
GryvnakD@xxxxxxxxxx.com

- -----------------------------------------------------------------
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Inc, Thor Inc, the VAC, or the WBCCI.

When replying to a message. please delete all unnecessary original text

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------------------------------

Date: Mon, 2 May 2005 00:16:42 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

Dave,

I am shocked. It would help if you could give more complete information on
your rig. I know you said it is a single axle, and I'm scratching my head
trying to come up with a vintage or even a new single axle model Airstream
rated for a gross of 4900 lbs.

Forrest

> -----Original Message-----
> From: valist-admin@xxxxxxxxxx.com
> [mailto:valist-admin@xxxxxxxxxx.com]On Behalf Of DAVID GRYVNAK
> Sent: Sunday, May 01, 2005 11:42 PM
> To: valist@xxxxxxxxxx.com
> Subject: RE: [VAL] Tires
>
>
> Forrest, my trailer weight is 4900#.  that is why I want to go to
> something better than D rated tires.  they are too marginal.
>
> Dave Gryvnak, GryvnakD@xxxxxxxxxx.com

------------------------------

Date: Mon, 2 May 2005 03:55:18 -0700 (PDT)
From: pamela <gypsylady624@xxxxxxxxxx.com>
Subject: Re: [VAL] ebay item

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4546055607&category=50063

 

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

------------------------------

Date: Mon, 02 May 2005 09:38:47 -0400
From: John Sellers <jsellers@spectra-research.com>
Subject: Re: [VAL] tire pump

Dave,

I carry one of the little 12 V DC air compressors sold almost everywhere 
nowadays in each of my vehicles, and they do a good job when needed.  They will 
go up to 150 PSI or so if you need it.  (Altho it takes a while.) I had a 
Sanborn compressor with a built in 12 V gel cell battery and a pressure gauge 
that worked fine for years until the rubber hose dried out and cracked.  The 
hose is crimped on to the compressor so it won't be easy to replace.  I think I 
only paid $30 for the compressor ten years ago so I guess I'll just pitch it.

If you are shopping for one, a built in gauge is a nice feature.  The tire chuck 
clips onto the valve so stopping to check the pressure is a nuisance.  One of my 
compressors is a Campbell-Hausfeld that gets around that problem by having a 
little valve stem of its own on the tire chuck that lets you check the pressure 
with a tire gauge while it's filling.

Best,
John Sellers
WBCCI/VAC # 1587
1960 Pacer (also single axle)
Dayton, Ohio

> Date: Sat, 30 Apr 2005 19:06:40 -0700 (PDT)
> From: DAVID GRYVNAK <gryvnakd@xxxxxxxxxx.com>
> Subject: Re: [VAL] test
> 
> When I go out with my 1960, single axel trailer, and we have gone 
> on three month and four month tours of the states, my biggest problem 
> is finding a place to pump up my tires.  Can anyone recommend a gret 
> pump that they use.

------------------------------

Date: Mon, 2 May 2005 11:12:13 -0400
From: "Scott Scheuermann" <s.l.scheuermann@xxxxxxxxxx.att.net>
Subject: Re: [VAL] pump/tires

Dave,

While I am not out quite as long at a time as you, I have just made it a
habit to fuel up at truck stops. Flying J is one favorite. They have special
RV islands with an air hose, water, dump, and propane right there next to
the fuel pump! No need to carry along an air pump for the tires, or go
looking for a place to dump!

BTW, my '60 26 footer, single axle, weighs in at under 5000# when loaded.
Load range D's are more than sufficient. (have been for the 25 years that I
have towed it!) I keep the tires at about 50 pounds and have not had a
problem other than once getting a cut on the valve stem creating a slow
leak. When checking tire temps they are never more than SLIGHTLY warm to the
touch, and they are always cooler than the tow vehicles tires, so I see no
problem.

Scott

- ----- Original Message ----- 
From: "DAVID GRYVNAK" <gryvnakd@xxxxxxxxxx.com>
To: <valist@xxxxxxxxxx.com>
Sent: Saturday, April 30, 2005 10:06 PM
Subject: Re: [VAL] test


> When I go out with my 1960, single axel trailer, and we have gone
> on three month and four month tours of the states, my biggest problem
> is finding a place to pump up my tires.  Can anyone recommend a gret
> pump that they use.  By the way, after all the disscussions about tires,
> I'm getting load range E tires that require 95 # pressure and steel
> valves.
> Dave Gryvnak, GryvnakD@xxxxxxxxxx.com

------------------------------

Date: Mon, 2 May 2005 11:15:44 -0400
From: "Scott Scheuermann" <s.l.scheuermann@xxxxxxxxxx.att.net>
Subject: Re: [VAL] Tires

Forrest,

FYI, the '60's did not come with an owner's manual...just an assortment of
loose papers pertaining mainly to appliances and gopher holes. I have yet to
see anything in them describing what pressure to keep the tires inflated to.
However I do agree that 95 psi is way too much.

Scott

- ----- Original Message ----- 
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
To: <valist@xxxxxxxxxx.com>
Sent: Sunday, May 01, 2005 1:02 AM
Subject: RE: [VAL] Tires


. The owner's manual for your single axle 1960 Airstream likely
> recommends 45 lbs. pressure and that is the pressure you should stay close
> to. Just because you use a tire capable of pressurizing to 95 does not
mean
> that you should.

------------------------------

Date: Mon, 2 May 2005 11:22:38 -0400
From: "Scott Scheuermann" <s.l.scheuermann@xxxxxxxxxx.att.net>
Subject: Re: [VAL] New Argosy

Dave,

Argosy owners are welcomed into WBCCI. I see that you are a member so go
ahead and get an additional number set and stick them on the trailer.

Scott Scheuermann
VAC Membership Chairman

- ----- Original Message ----- 
From: "Dave Lowrey" <airstream@xxxxxxxxxx.com>

> Do people put WBCCI numbers on their Argosys?
> Thanks!
>
> Dave

------------------------------

Date: Mon, 02 May 2005 11:39:21 -0400
From: "Peter Ryner" <pryner@xxxxxxxxxx.net>
Subject: RE: [VAL] Tires

I wouldn't be too fast to say that the PSI is too high.  I had a '60 22'
Safari and put E load tires on and kept them at 90 PSI according to what was
listed on the tire.  Never had a problem with bouncing or tracking.  I have
the same type tires on my current trailer and Michelin tires on my Dodge
2500 Diesel.  I keep both at about 90 PSI with no problems.  The tires are
designed to operate at the higher pressures and handle well.  You can have
just as many problems with an under inflated tire as it is easy to get heat
buildup which will cause early failure.
Pete

- -----Original Message-----
From: valist-admin@xxxxxxxxxx.com
[mailto:valist-admin@xxxxxxxxxx.com]On Behalf Of Scott Scheuermann
Sent: Monday, May 02, 2005 11:16 AM
To: valist@xxxxxxxxxx.com
Subject: Re: [VAL] Tires


Forrest,

FYI, the '60's did not come with an owner's manual...just an assortment of
loose papers pertaining mainly to appliances and gopher holes. I have yet to
see anything in them describing what pressure to keep the tires inflated to.
However I do agree that 95 psi is way too much.

Scott

- ----- Original Message -----
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
To: <valist@xxxxxxxxxx.com>
Sent: Sunday, May 01, 2005 1:02 AM
Subject: RE: [VAL] Tires


. The owner's manual for your single axle 1960 Airstream likely
> recommends 45 lbs. pressure and that is the pressure you should stay close
> to. Just because you use a tire capable of pressurizing to 95 does not
mean
> that you should.

------------------------------

Date: Mon, 2 May 2005 12:07:21 -0700
From: "Colin Hyde" <chyde@primelink1.net>
Subject: Re: [VAL] Tires

> I wouldn't be too fast to say that the PSI is too high.  I had a '60 22'
> Safari and put E load tires on and kept them at 90 PSI according to what
was
> listed on the tire.  Never had a problem with bouncing or tracking.    The
tires are
> designed to operate at the higher pressures and handle well.  You can have
> just as many problems with an under inflated tire as it is easy to get
heat
> buildup which will cause early failure.
> Pete

Pete,
Just because the tire says 90 psi on the side doesn't mean it should be run
at that pressure. That is a maximum pressure that the manufacturer
recommends. Proper  tire pressures are determined by load. If a tire is
underinflated for a given load it will get hot and wear on the outer edges
of the tread. If it is overinflated it will wear in the center of the tread.
Proper inflation will give even wear across the tire which in turn shows a
full contact patch for the tire and the best possible adhesion. Back in my
car racing days we used a pyrometer to check tire surface temps on the outer
edges and in the center. With a bit of fine tuning of the pressures, wheel
camber and toe, we could get the car to handle well with even tire  wear and
temps. I suspect he only way your Safari would require 90 psi using the
recommended tires  is if the trailer itself  was overloaded.
Hopefully this doesn't start a big controversy
Colin Hyde

------------------------------

Date: Mon, 2 May 2005 09:13:22 -0700 (PDT)
From: DAVID GRYVNAK <gryvnakd@xxxxxxxxxx.com>
Subject: RE: [VAL] Tires

Pete,  What brand of tire did you find with a load range E.  And do you have 
a pump that will allow you to pump themm up when your out traveling?
 
Dave

Peter Ryner <pryner@xxxxxxxxxx.net> wrote:
I wouldn't be too fast to say that the PSI is too high. I had a '60 22'
Safari and put E load tires on and kept them at 90 PSI according to what was
listed on the tire. Never had a problem with bouncing or tracking. I have
the same type tires on my current trailer and Michelin tires on my Dodge
2500 Diesel. I keep both at about 90 PSI with no problems. The tires are
designed to operate at the higher pressures and handle well. You can have
just as many problems with an under inflated tire as it is easy to get heat
buildup which will cause early failure.
Pete

- -----Original Message-----
From: valist-admin@xxxxxxxxxx.com
[mailto:valist-admin@xxxxxxxxxx.com]On Behalf Of Scott Scheuermann
Sent: Monday, May 02, 2005 11:16 AM
To: valist@xxxxxxxxxx.com
Subject: Re: [VAL] Tires


Forrest,

FYI, the '60's did not come with an owner's manual...just an assortment of
loose papers pertaining mainly to appliances and gopher holes. I have yet to
see anything in them describing what pressure to keep the tires inflated to.
However I do agree that 95 psi is way too much.

Scott

- ----- Original Message -----
From: "Forrest McClure" 
To: 
Sent: Sunday, May 01, 2005 1:02 AM
Subject: RE: [VAL] Tires


. The owner's manual for your single axle 1960 Airstream likely
> recommends 45 lbs. pressure and that is the pressure you should stay close
> to. Just because you use a tire capable of pressurizing to 95 does not
mean
> that you should.





  Dave
GryvnakD@xxxxxxxxxx.com

- -----------------------------------------------------------------
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Inc, Thor Inc, the VAC, or the WBCCI.

When replying to a message. please delete all unnecessary original text

To unsubscribe or change to a digest format, please go to
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------------------------------

Date: Mon, 2 May 2005 09:20:30 -0700 (PDT)
From: DAVID GRYVNAK <gryvnakd@xxxxxxxxxx.com>
Subject: Re: [VAL] pump/tires

Scott,  What brand tires did you use?  I've had 5 blowouts with Goodyear 
Marathons load range D pressurized to 65#
 
Dave

Scott Scheuermann <s.l.scheuermann@xxxxxxxxxx.att.net> wrote:
Dave,

While I am not out quite as long at a time as you, I have just made it a
habit to fuel up at truck stops. Flying J is one favorite. They have special
RV islands with an air hose, water, dump, and propane right there next to
the fuel pump! No need to carry along an air pump for the tires, or go
looking for a place to dump!

BTW, my '60 26 footer, single axle, weighs in at under 5000# when loaded.
Load range D's are more than sufficient. (have been for the 25 years that I
have towed it!) I keep the tires at about 50 pounds and have not had a
problem other than once getting a cut on the valve stem creating a slow
leak. When checking tire temps they are never more than SLIGHTLY warm to the
touch, and they are always cooler than the tow vehicles tires, so I see no
problem.

Scott

- ----- Original Message ----- 
From: "DAVID GRYVNAK" 
To: 
Sent: Saturday, April 30, 2005 10:06 PM
Subject: Re: [VAL] test


> When I go out with my 1960, single axel trailer, and we have gone
> on three month and four month tours of the states, my biggest problem
> is finding a place to pump up my tires. Can anyone recommend a gret
> pump that they use. By the way, after all the disscussions about tires,
> I'm getting load range E tires that require 95 # pressure and steel
> valves.
> Dave Gryvnak, GryvnakD@xxxxxxxxxx.com





  Dave
GryvnakD@xxxxxxxxxx.com

- -----------------------------------------------------------------
This e-mail list is not sponsored by or affiliated in any way with Airstream
Inc, Thor Inc, the VAC, or the WBCCI.

When replying to a message. please delete all unnecessary original text

To unsubscribe or change to a digest format, please go to
http://www.tompatterson.com/VAC/VAList/listoffice.html

------------------------------

Date: Mon, 2 May 2005 12:25:04 -0400
From: "Scott Scheuermann" <s.l.scheuermann@xxxxxxxxxx.att.net>
Subject: Re: [VAL] Tires

Forrest,

In '60 the 24 foot Trade Wind came with a single axle. The 26 foot Overland
also had a single axle, but a dual axle was an option. I have seen pics of a
50's trailer with a single axle that looked to be longer than 26 feet, have
never seen one in person, but there still may be a few of them out there.
The empty weight for my Overlander (single axle) is listed as 3250 pounds. I
have always said that my trailer weighs 5000# when loaded for travel knowing
that there was a comfortable margin for error. So I just pulled my scale
sheets out to get accurate numbers. When loaded and with a full water tank
the total weight was (in 1995) 4170# with 540 of it on the tongue. Even if I
just take the full weight and divide it by 2 (ignoring the weight that the
tow vehicle carries) I still only have 2085 pounds that each tire is
expected to carry. The Load range C's are rated for 2150 at 50 psi. so I
could use C's. However I do know that since '95 I have increased the fresh
water capacity, added a wash water tank and added 2 children to the mix. So
do I need to re-weigh? Yes, but I am currently using Load range D's inflated
to 55 psi, which according to a GY chart I have from a few years ago should
be good for 2270 pounds. Since the tires run cool I feel confident that they
are not overloaded, but I will re-weigh in the future just to be sure.

David has stated that his trailer weighs 4900#, nearly 2000# more than its
dry weight of 3030 pounds.

Ignoring the tongue weight that the tow vehicle carries, his tires are being
asked to handle 2450# The D's inflated to 65 psi will handle 2540# so he is
OK. At first glance he only has a safety margin of 90# per tire, but
remember that the tow vehicle is supporting at least half (Most likely most)
of the tongue weight. Assuming a 15% tongue weight his should be about 735
pounds. Half of that is 377. Half again for each tire and you have just
found that you have doubled you safety margin of 90# to 180# per tire. Since
his weight distrib bars are probably distributing less that half the tongue
weight to the tires he really should have an even greater safety margin. So
Dave really is OK with D's. However he, like I, likes to have a comfortable
safety margin, so he is considering E's. I understand that. But he really
needs to consider the overall weight of his trailer. Was his trailer
designed to carry 1 ton of "stuff"? I doubt it. I suspect that he has
overloaded the trailer. I have yet to see a maximum weight published for
these trailers, so I cannot proclaim that his is overloaded beyond design.
However, check the modern trailers. They only give you 1000# for stuff,
sometimes less. So I highly suspect that his is overloaded.

Dave, I highly recommend that you and your wife go through everything in the
trailer and purge the stuff that you really don't use, but feel that you
should take along just in case. If you havn't really needed to use it in the
last year or two, you probably don't need it. Just because there is room for
it does not mean that the trailer was designed to handle the weight.

I preached the gospel of weight to a past VAC president. He ignored me. He
broke the frame on his '50 something trailer within a year. Too bad, it
still sits, waiting to be fixed.

Scott


- ----- Original Message ----- 
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
To: <valist@xxxxxxxxxx.com>
Sent: Monday, May 02, 2005 2:16 AM
Subject: RE: [VAL] Tires


> Dave,
>
> I am shocked. It would help if you could give more complete information on
> your rig. I know you said it is a single axle, and I'm scratching my head
> trying to come up with a vintage or even a new single axle model Airstream
> rated for a gross of 4900 lbs.
>
> Forrest

------------------------------

Date: Mon, 2 May 2005 09:26:03 -0700 (PDT)
From: DAVID GRYVNAK <gryvnakd@xxxxxxxxxx.com>
Subject: Re: [VAL] tire pump

Thanks John that is the kind of info that I'm looking for 
 
Dave

John Sellers <jsellers@spectra-research.com> wrote:
Dave,

I carry one of the little 12 V DC air compressors sold almost everywhere 
nowadays in each of my vehicles, and they do a good job when needed. They will 
go up to 150 PSI or so if you need it. (Altho it takes a while.) I had a 
Sanborn compressor with a built in 12 V gel cell battery and a pressure gauge 
that worked fine for years until the rubber hose dried out and cracked. The 
hose is crimped on to the compressor so it won't be easy to replace. I think I 
only paid $30 for the compressor ten years ago so I guess I'll just pitch it.

If you are shopping for one, a built in gauge is a nice feature. The tire chuck 
clips onto the valve so stopping to check the pressure is a nuisance. One of my 
compressors is a Campbell-Hausfeld that gets around that problem by having a 
little valve stem of its own on the tire chuck that lets you check the pressure 
with a tire gauge while it's filling.

Best,
John Sellers
WBCCI/VAC # 1587
1960 Pacer (also single axle)
Dayton, Ohio

> Date: Sat, 30 Apr 2005 19:06:40 -0700 (PDT)
> From: DAVID GRYVNAK 
> Subject: Re: [VAL] test
> 
> When I go out with my 1960, single axel trailer, and we have gone 
> on three month and four month tours of the states, my biggest problem 
> is finding a place to pump up my tires. Can anyone recommend a gret 
> pump that they use.





  Dave
GryvnakD@xxxxxxxxxx.com

- -----------------------------------------------------------------
This e-mail list is not sponsored by or affiliated in any way with Airstream
Inc, Thor Inc, the VAC, or the WBCCI.

When replying to a message. please delete all unnecessary original text

To unsubscribe or change to a digest format, please go to
http://www.tompatterson.com/VAC/VAList/listoffice.html

------------------------------

Date: Mon, 02 May 2005 10:12:38 -0500
From: Gerald <geraldj@xxxxxxxxxx.com>
Subject: Re: [VAL] re-keying

On Sun, 2005-05-01 at 20:23 -0700, Gary Heebner wrote:
> Hello to all,
> At the end of last season, I was unable to locate my trailer keys and just
> assumed that they were somewhere in the 'toaster'.  Well...I just brought it
> home from winter hibernation and searched every nook and cranny--no luck!!!  I
> even called the last campground I was at last season.  What now?
> 
> Can a locksmith cut new keys for all those compartments and the main door (all
> compartments are presently locked)?  What to do?
> 
> Gary Heebner
> "4slice"
> '77 31'
> Prince George, BC
The main door will be the biggest problem. The other doors likely have
the same key in many similar Airstreams. A good locksmith should be able
to pick every lock and then most will come apart to have a key made or
to be repinned to a new key. The door lock is the hardest to get to the
cylinder, I think.

Gerald J.

------------------------------

Date: Mon, 02 May 2005 10:20:25 -0500
From: Gerald <geraldj@xxxxxxxxxx.com>
Subject: RE: [VAL] Tires

On Sun, 2005-05-01 at 22:42 -0700, DAVID GRYVNAK wrote:
> Forrest, my trailer weight is 4900#.  that is why I want to go to 
something better than D rated tires.  they are too marginal.
>  
> Dave Gryvnak, GryvnakD@xxxxxxxxxx.com
You can run lower pressure in the E rated tires to give them more
flexibility.

I want to push for RADIAL trailer tires so they have the same braking as
the tow vehicles radial tires for better panic stops.

I'd expect the E rated tires when flexing under load and run at the
pressure that holds the load properly to run a little bit warmer than D
rated tires because the E rated tires will have more sidewall material
to flex than D rated tires. But that added material will give the E
rated tires a bit better lateral stability.

On a single axle trailer you can run the tire pressure so that it just
holds up the load and so allow the tire to act as part of the cushion.

I'm thinking that the load division between tires on a dual or three
axle Airstream isn't so good so that a couple tires run at the pressure
to hold their share of the load are going to be overloaded and show lots
of heating and short lives. Misalignment from bent axles or spindles or
poor factory assembly is going to make some of the tires heat even
worse. Even the single axle trailer could suffer from excess toe in or
out to lead to tire heating.

Gerald J.

------------------------------

Date: Mon, 02 May 2005 10:38:27 -0500
From: Gerald <geraldj@xxxxxxxxxx.com>
Subject: Re: [VAL] Tires

On Mon, 2005-05-02 at 12:07 -0700, Colin Hyde wrote:
> > I wouldn't be too fast to say that the PSI is too high.  I had a '60 22'
> > Safari and put E load tires on and kept them at 90 PSI according to what
> was
> > listed on the tire.  Never had a problem with bouncing or tracking.    The
> tires are
> > designed to operate at the higher pressures and handle well.  You can have
> > just as many problems with an under inflated tire as it is easy to get
> heat
> > buildup which will cause early failure.
> > Pete
> 
> Pete,
> Just because the tire says 90 psi on the side doesn't mean it should be run
> at that pressure. That is a maximum pressure that the manufacturer
> recommends. Proper  tire pressures are determined by load. If a tire is
> underinflated for a given load it will get hot and wear on the outer edges
> of the tread. If it is overinflated it will wear in the center of the tread.

These edge and center wear patterns are only true for bias ply tires.
The belt in radials confuses that issue considerably. If that belt isn't
full tread width, actually the edges of a radial tire will wear more
from over inflation than the middle because the belt keeps the tire
center from expanding.

And I suggest that if the tow vehicle has radial tires, the trailer
should have radials so the braking is comparable, else the bias ply
tires on the trailer will lock up and skid before the those on the tow
vehicle leading to the trailer trying to pass the tow vehicle. Not good
control in a hard stop.

> Proper inflation will give even wear across the tire which in turn shows a
> full contact patch for the tire and the best possible adhesion. Back in my
> car racing days we used a pyrometer to check tire surface temps on the outer
> edges and in the center. With a bit of fine tuning of the pressures, wheel
> camber and toe, we could get the car to handle well with even tire  wear and
> temps. I suspect he only way your Safari would require 90 psi using the
> recommended tires  is if the trailer itself  was overloaded.
> Hopefully this doesn't start a big controversy
> Colin Hyde

- -- 
Gerald J.
Dr. Gerald N. Johnson, electrical engineer
WBCCI #5623, VAC
All content copyright.

------------------------------

Date: Mon, 2 May 2005 12:45:36 -0400
From: "Scott Scheuermann" <s.l.scheuermann@xxxxxxxxxx.att.net>
Subject: Re: [VAL] Tires

Pete,

What is listed on the tire is the psi for a maximum weight. If you have less
weight, you don't need all the psi. What is needed here is an inflation
chart for a Load E tire. My Good Year chart does not go beyond a Load range
D, so we can't say for sure.

Scott
- ----- Original Message ----- 
From: "Peter Ryner" <pryner@xxxxxxxxxx.net>
To: <valist@xxxxxxxxxx.com>
Sent: Monday, May 02, 2005 11:39 AM
Subject: RE: [VAL] Tires


> I wouldn't be too fast to say that the PSI is too high.  I had a '60 22'
> Safari and put E load tires on and kept them at 90 PSI according to what
was
> listed on the tire.  Never had a problem with bouncing or tracking.  I
have
> the same type tires on my current trailer and Michelin tires on my Dodge
> 2500 Diesel.  I keep both at about 90 PSI with no problems.  The tires are
> designed to operate at the higher pressures and handle well.  You can have
> just as many problems with an under inflated tire as it is easy to get
heat
> buildup which will cause early failure.
> Pete

------------------------------

Date: Mon, 2 May 2005 12:51:17 -0400
From: "Scott Scheuermann" <s.l.scheuermann@xxxxxxxxxx.att.net>
Subject: Re: [VAL] pump/tires

Good Year Marathons...for the last 20 years...no problems. And at 50 psi
they run cool.

Scott
- ----- Original Message ----- 
From: "DAVID GRYVNAK" <gryvnakd@xxxxxxxxxx.com>
To: <valist@xxxxxxxxxx.com>
Sent: Monday, May 02, 2005 12:20 PM
Subject: Re: [VAL] pump/tires


> Scott,  What brand tires did you use?  I've had 5 blowouts with Goodyear
Marathons load range D pressurized to 65#
>
> Dave

------------------------------

Date: Mon, 2 May 2005 10:21:12 -0700 (PDT)
From: Courtney Gwyn <rufuscourtney@xxxxxxxxxx.com>
Subject: Re: [VAL] tire pump

Dave,
 
I carry a CO2 cylinder. It allows me to air up all my tires and run air tools. 
It is about 30" long and stows easily.
 
Courtney


> 
> When I go out with my 1960, single axel trailer, and we have gone 
> on three month and four month tours of the states, my biggest problem 
> is finding a place to pump up my tires. Can anyone recommend a gret 
> pump that they use.



__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

------------------------------

Date: Mon, 2 May 2005 11:46:10 -0600
From: "Randy Unter" <runter@xxxxxxxxxx.net>
Subject: [VAL] CEILING LIGHT COVER

Joe, I pulled most of the ceiling light fixtures out of my '73 Sovereign
which are square with bulbs on each side. The Sovereign uses a combined
light fixture/fan unit.
Let me know if these would work.
Randy Unter
Denver

> Date: Sat, 30 Apr 2005 22:00:07 -0500
> From: "Joe Logsdon" <logsdonj@xxxxxxxxxx.net>
> Subject: [VAL] CEILING LIGHT COVER
>
> Hello,
>
> I have been montering this list for some time now and have found it
enjoyable.
>
> I am a Farmer in Southern Illinois and hope to be retired soon and take up
> some serious traveling.
>
> I purchased  a 1970 Overlander last fall and have been during various
repairs
> ever since. Hope to have it travelable in the near future.
>
> I am in need of ceiling light cover approximately 8" diameter x 1 3/4"
deep.
> This is a three bulb 12 volt light. Are these available or must I replace
the
> entire light assembly. Have tried Inland RV and Airstream Dreams to no
avail.
>
> Thanks,
>
> Joe Logsdon
> WBCCI #5498, VAC
> Shawneetown, Illinois
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.308 / Virus Database: 266.10.4 - Release Date: 4/27/2005

------------------------------

Date: Mon, 2 May 2005 11:53:07 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

Scott,

Yes, the very early sixties did not have owner's manuals, I think though
that started in 1964. I know for sure that from 1965 and after all had
owner's manuals. My manual for instance says, "The proper pressure for tires
supplied with your Airstream (7.00 x15)is 45 psi; (the 6.70 x 15 tires used
on the Caravel use 40 psi)." Likewise the manual for my Overlander gives a
tire pressure of 45 psi.

You bring up a good point for discussion. I think I was under the impression
that Dave's Airstream used a Dura Torque axle.  I tend to think about axles
in the sixties as all being Henchen Dura Torque and forget that it wasn't
introduced until 1961. Prior to that the axles were leaf spring and even the
larger trailers, such as yours, often had only one axle. With the leaf
spring designs I imagine there was greater availability of higher capacity
axles. Obviously, since your '60 28' (an Ambassador I guess?) has a single
axle it must be of higher weight capacity than the Dura Torque.

What I'm wondering is if the original Dura Torque axles came in more than
two weight capacities? For instance I know that the Dura Torque axle used on
the Caravel and Bambi had axles rated at about 3,200 lbs. (I say about
because I don't have specs to refer to), and then the axles on the Globe
Trotter up to the Sovereign were rated at about 4,000 lbs. So, we see
Airstream going to dual axles on more of their models starting in 1961.

Now you say that your trailer weighs in at "under 5000#" so I suppose you
have a leaf spring axle? If so, can you tell us what your axle is rated to
carry? The reason I ask is that tire capacity ought to be somewhat
commensurate with axle capacity. So, if Dave has leaf spring axles rated at
over 5000 lbs then him wanting to use an 8 ply tire wouldn't be
unreasonable. Specifications for your 28' 1960 Airstream is an 8 ply tire
(I'm not speculating on that - it is stated in the sales brochure - "Heavy
Duty Axle, 8 ply tires").

Forrest

------------------------------

Date: Mon, 02 May 2005 12:04:24 -0500
From: Gerald <geraldj@xxxxxxxxxx.com>
Subject: RE: [VAL] Tires

On Mon, 2005-05-02 at 11:53 -0600, Forrest McClure wrote:
> Scott,
> 
> Yes, the very early sixties did not have owner's manuals, I think though
> that started in 1964. I know for sure that from 1965 and after all had
> owner's manuals. My manual for instance says, "The proper pressure for tires
> supplied with your Airstream (7.00 x15)is 45 psi; (the 6.70 x 15 tires used
> on the Caravel use 40 psi)." Likewise the manual for my Overlander gives a
> tire pressure of 45 psi.
> 
> You bring up a good point for discussion. I think I was under the impression
> that Dave's Airstream used a Dura Torque axle.  I tend to think about axles
> in the sixties as all being Henchen Dura Torque and forget that it wasn't
> introduced until 1961. Prior to that the axles were leaf spring and even the
> larger trailers, such as yours, often had only one axle. With the leaf
> spring designs I imagine there was greater availability of higher capacity
> axles. Obviously, since your '60 28' (an Ambassador I guess?) has a single
> axle it must be of higher weight capacity than the Dura Torque.
> 
> What I'm wondering is if the original Dura Torque axles came in more than
> two weight capacities? For instance I know that the Dura Torque axle used on
> the Caravel and Bambi had axles rated at about 3,200 lbs. (I say about
> because I don't have specs to refer to), and then the axles on the Globe
> Trotter up to the Sovereign were rated at about 4,000 lbs. So, we see
> Airstream going to dual axles on more of their models starting in 1961.
> 
> Now you say that your trailer weighs in at "under 5000#" so I suppose you
> have a leaf spring axle? If so, can you tell us what your axle is rated to
> carry? The reason I ask is that tire capacity ought to be somewhat
> commensurate with axle capacity. So, if Dave has leaf spring axles rated at
> over 5000 lbs then him wanting to use an 8 ply tire wouldn't be
> unreasonable. Specifications for your 28' 1960 Airstream is an 8 ply tire
> (I'm not speculating on that - it is stated in the sales brochure - "Heavy
> Duty Axle, 8 ply tires").
> 
> Forrest
Technically its spring rating that's most critical to the suspension
system. So long as the sprung axle bearings and spindles are good for
more than their load they don't affect longevity of tires or ride of
trailer.


- -- 
Gerald J.
Dr. Gerald N. Johnson, electrical engineer
WBCCI #5623, VAC
All content copyright.

------------------------------

Date: Mon, 2 May 2005 14:08:42 EDT
From: SCORCHR@xxxxxxxxxx.com
Subject: Re: [VAL] Tires

Forrest,
 
My '64 Globetrotter came with an owners manual.  Still intact.
 
Steven

------------------------------

Date: Mon, 2 May 2005 11:26:51 -0700 (PDT)
From: DAVID GRYVNAK <gryvnakd@xxxxxxxxxx.com>
Subject: RE: [VAL] Tires

Forrest,  How do I find out what axel I have?
 
Dave

Forrest McClure <forrest@xxxxxxxxxx.org> wrote:
Scott,

Yes, the very early sixties did not have owner's manuals, I think though
that started in 1964. I know for sure that from 1965 and after all had
owner's manuals. My manual for instance says, "The proper pressure for tires
supplied with your Airstream (7.00 x15)is 45 psi; (the 6.70 x 15 tires used
on the Caravel use 40 psi)." Likewise the manual for my Overlander gives a
tire pressure of 45 psi.

You bring up a good point for discussion. I think I was under the impression
that Dave's Airstream used a Dura Torque axle. I tend to think about axles
in the sixties as all being Henchen Dura Torque and forget that it wasn't
introduced until 1961. Prior to that the axles were leaf spring and even the
larger trailers, such as yours, often had only one axle. With the leaf
spring designs I imagine there was greater availability of higher capacity
axles. Obviously, since your '60 28' (an Ambassador I guess?) has a single
axle it must be of higher weight capacity than the Dura Torque.

What I'm wondering is if the original Dura Torque axles came in more than
two weight capacities? For instance I know that the Dura Torque axle used on
the Caravel and Bambi had axles rated at about 3,200 lbs. (I say about
because I don't have specs to refer to), and then the axles on the Globe
Trotter up to the Sovereign were rated at about 4,000 lbs. So, we see
Airstream going to dual axles on more of their models starting in 1961.

Now you say that your trailer weighs in at "under 5000#" so I suppose you
have a leaf spring axle? If so, can you tell us what your axle is rated to
carry? The reason I ask is that tire capacity ought to be somewhat
commensurate with axle capacity. So, if Dave has leaf spring axles rated at
over 5000 lbs then him wanting to use an 8 ply tire wouldn't be
unreasonable. Specifications for your 28' 1960 Airstream is an 8 ply tire
(I'm not speculating on that - it is stated in the sales brochure - "Heavy
Duty Axle, 8 ply tires").

Forrest





  Dave
GryvnakD@xxxxxxxxxx.com

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------------------------------

Date: Mon, 02 May 2005 12:57:58 -0500
From: Gerald <geraldj@xxxxxxxxxx.com>
Subject: RE: [VAL] Tires

On Mon, 2005-05-02 at 11:26 -0700, DAVID GRYVNAK wrote:
> Forrest,  How do I find out what axle I have?
>  
> Dave

The pre Henschen axles will have half elliptical springs exposed, like
many other trailers and pickup rear springs.

Telling the two versions of the Henschen axles apart may be difficult,
possibly needing only a different hardness of the elastomer rods when
assembled. Ideally they would have a tag identifying them. That might be
found by crawling under the trailer. Otherwise maybe only the factory
bill of material might identify which axles were supplied, if it still
exists for your trailer. Bearing sizes should be different between the
two sizes as another way of identification.

But the load rating of the original Henschen axles is a moot point
today, the elastomers having hardened with age to the point they are
much stiffer than they were when new some 40 years ago. Now the load
limit is the bearings and arms, not the elastomers.

- -- 
Gerald J.
Dr. Gerald N. Johnson, electrical engineer
WBCCI #5623, VAC
All content copyright.

------------------------------

Date: Mon, 2 May 2005 13:01:19 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

Dave,

With the Dura Torque axle there are no leaf springs. It is a rubber torsion
design, and the axle suspension is entirely self-contained within the axle.
So, look under your trailer. If you see the axle supported by straps of
metal stacked toghether then you have a leaf spring design. Othewise it will
be a Henchen or possibly an equivilant Dexter rubber torsion design. If you
crawl under to get a close look at the axle you will likely find a metal tag
attached that will tell you the manufacturer and the axle's max weight
capacity.

Forrest

------------------------------

Date: Mon, 2 May 2005 13:06:15 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

Gerald,

Right. Most, if not all, original Dura Torque axles from the sixties and
even the seventies need to be replaced. The rubber bars in them has likely
hardened and compressed to the point where they offer little shock
absorption. The lighter weight Dura Torque axle on the Bambi and Caravel
have a smaller spindle on them, as well as bearings.

Forrest

------------------------------

Date: Mon, 2 May 2005 13:07:22 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

Pete,

Didn't you have frame separation problems last year, or was that someone
else?

Forrest

> -----Original Message-----
> From: valist-admin@xxxxxxxxxx.com
> [mailto:valist-admin@xxxxxxxxxx.com]On Behalf Of Peter Ryner
> Sent: Monday, May 02, 2005 9:39 AM
> To: valist@xxxxxxxxxx.com
> Subject: RE: [VAL] Tires
>
>
> I wouldn't be too fast to say that the PSI is too high.  I had a '60 22'
> Safari and put E load tires on and kept them at 90 PSI according
> to what was
> listed on the tire.  Never had a problem with bouncing or
> tracking.  I have
> the same type tires on my current trailer and Michelin tires on my Dodge
> 2500 Diesel.  I keep both at about 90 PSI with no problems.  The tires are
> designed to operate at the higher pressures and handle well.  You can have
> just as many problems with an under inflated tire as it is easy
> to get heat
> buildup which will cause early failure.
> Pete

------------------------------

Date: Mon, 2 May 2005 13:18:42 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

All,

For what its worth here is a post from a member of Airstreamforums. I have
used his method of determining the ideal tire pressure on my own trailer and
feel that it works quite well.

"The Real Answer to Tire Pressure"
"I worked for Michelin Tire Corporation for 7 years and Yokohama Tire
Corporation for 11 years. I have given numerous tire seminars on tire
maintenance and especially how to determine the correct tire pressures. So
here goes."
"The pressure on the sidewall of the tire is the maximum pressure at the
published load at approximately 55 mph. (The speed can vary somewhat but it
is not important for our discussion)."
"The air pressure is required to support the load that the tire must carry
in such a manner that the tire flexes at the designed place on the sidewall
of the tire."
"If the load on the tire changes then the air pressure should change
accordingly to keep the tire flexing at the proper place."
"The reason for correct air pressure is to prevent the tire from
overheating. It was put together with heat and it will come apart the same
way. An under inflated tire will eventually self destruct due to excessive
heat build up. An over inflated tire will ride harshly and be more likely to
burst upon impact. Sorry for the long explanation but here is the bottom
line.
To determine the correct air pressure, check the pressure when the tire is
cold. Run the tire for several miles at highway speed. Stop and immediately
check the air pressue in the tire. It should be higher than we cold but no
more than 10% higher.
Now here is the hard to believe part. If the pressure is more than 10%
higher you must ADD AIR and test again. For example if you start with 50 psi
cold. If the pressure is 60 when hot, you have exceeded the (10%) in this
case, 55 psi maximum safe heat build up pressure. You must ADD AIR. In this
case I would add 5 psi which would take the tire to 65 psi when hot. After
you run the tire again you will find the pressure to actually drop because
the tire will run cooler. The heat build up causes the tire pressure to
increase when under inflated."
"On the other hand, if the 50 psi cold pressure does not change when hot.
You have more air than needed. You can remove 5 psi or so and test again
when they return to cold. Like the next trip you take."
"So a fully loaded rig will require more air in the tires than one with
empty tanks and a light load on board. Always error on the side of over
inflation. Thus the maximum sidewall pressure indicated on the tire is
usually used. It usually is more than needed. Each axle has its own
requirement based upon the load on that axle."

Written by "AccessMaster" on Airstreamforums.com 04-11-2003, 10:11 AM


Forrest

------------------------------

Date: Mon, 2 May 2005 16:20:30 -0400
From: "Scott Scheuermann" <s.l.scheuermann@xxxxxxxxxx.att.net>
Subject: Re: [VAL] Tires

Forrest,

It is a 26 foot Overlander, not a 28 footer. The sales brochure I have for
'60 shows the Ambassador having 2 axles.

I have no idea what my axle is rated for, but you are correct, it has leaf
springs.

My sales brochure makes no mention of tires or axle.

Scott

- ----- Original Message ----- 
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
To: <valist@xxxxxxxxxx.com>
Sent: Monday, May 02, 2005 1:53 PM
Subject: RE: [VAL] Tires


> Scott,
>
With the leaf
> spring designs I imagine there was greater availability of higher capacity
> axles. Obviously, since your '60 28' (an Ambassador I guess?) has a single
> axle it must be of higher weight capacity than the Dura Torque.
>

> Now you say that your trailer weighs in at "under 5000#" so I suppose you
> have a leaf spring axle? If so, can you tell us what your axle is rated to
> carry? The reason I ask is that tire capacity ought to be somewhat
> commensurate with axle capacity. So, if Dave has leaf spring axles rated
at
> over 5000 lbs then him wanting to use an 8 ply tire wouldn't be
> unreasonable. Specifications for your 28' 1960 Airstream is an 8 ply tire
> (I'm not speculating on that - it is stated in the sales brochure - "Heavy
> Duty Axle, 8 ply tires").
>
> Forrest

------------------------------

Date: Mon, 2 May 2005 15:15:47 -0600
From: "Forrest McClure" <forrest@xxxxxxxxxx.org>
Subject: RE: [VAL] Tires

Scott,

You're right, I either mis-read your post or got it confused with someone
else's. Unfortunately the brochure I have doesn't show your Overlander, just
the Ambassador, Tradewind, and Flying Cloud. At any rate the brochure I have
says heavy duty axle, 8 ply tires for those three models. So, it is likely
that would be the case for your Overlander too. I can e-mail the brochure to
you off-list if you want.

Forrest

------------------------------

Date: Mon, 02 May 2005 14:50:40 -0700
From: Tony Seidel <tonyseidel@xxxxxxxxxx.net>
Subject: [VAL] '66 Caravel electric issues

Greetings from a new (4 weeks) owner of a 17-ft. 1966 Caravel. I'd love to
hear from anyone who has replaced their original converter. I think mine's
shot - I have 110VAC to the outlets, but no 12V for lights. I've checked the
two circuit breakers in the head closet, and the fuses on the "Univolt" or
whatever it is are o.k.

What size (amps) unit do I need, any recommended brand and source, and has
anyone installed (i.e., wired) it themselves?

Thanks,

Tony in Sonora, CA


Dial Broadband has arrived Nationwide! Up to 5 times faster than traditional dialup 
connections from $13.33/month! See the demo for yourself at <a href="
http://www.BigValley.net">www.BigValley.net</a> 

------------------------------

Date: Mon, 2 May 2005 15:17:13 -0700
From: "Gary Quamen" <g_quamen@xxxxxxxxxx.net>
Subject: Re: [VAL] '66 Caravel electric issues

> Greetings from a new (4 weeks) owner of a 17-ft. 1966 Caravel. I'd love to
> hear from anyone who has replaced their original converter. I think mine's
> shot - I have 110VAC to the outlets, but no 12V for lights. I've checked
the
> two circuit breakers in the head closet, and the fuses on the "Univolt" or
> whatever it is are o.k.

Hi Tony:

I looked in my '67 manual and noticed that the Caravel is different from all
the other larger models in the way the the electrical system works.  It
seems to require throwing some switches in the "trunk compartment" to
utilize the 12V system.  If you know all this.....ignore this post.  If you
don't, I'll be glad to scan the page that deals with it and e-mail it to
you.  Lemme know.

GQ '67 Safari
4082 in CA (Bay Area)

------------------------------

Date: Mon, 2 May 2005 21:52:25 EDT
From: JSmith1805@xxxxxxxxxx.com
Subject: Re: [VAL] Tires

I just looked at the owners manual for my 1965 Tradewind Double It lists the 
weight as 3810 LBS( I assime empty)Hitch weight 430LBS tires as &00x15, 6-ply 
nylonn with tubes recommend tire pressure 45psi. For the last 4 years I have 
used Cooper load range C and have towed aprox 20 k miles no provlems until I 
came back from Sarasota rally and when I got back to Tampa I found I had a flat 
somewhere an the way back it seemed to ride ok in the rain on 3 inflated 
tires. I cannot understand why it is necessary to have D or E tires with extream 
aor pressure when this unit loaded does not weigh any more than one of the large 
autos.
I am planning on replacing the Axles before I take any long trips and can 
find no reason why the new tires could not very well be Sears Road handler They 
gave fantastic service on my Suberan which weighed abot the same ae the trailer.
The manual also listed the tires on the Caravel as 7:50x14 and the proper 
inflation as40 PSI
Jim Smith

------------------------------

Date: Mon, 02 May 2005 20:25:02 -0500
From: Gerald <geraldj@xxxxxxxxxx.com>
Subject: RE: [VAL] Tires

On Mon, 2005-05-02 at 13:18 -0600, Forrest McClure wrote:
> All,
> 
> For what its worth here is a post from a member of Airstream forums. I have
> used his method of determining the ideal tire pressure on my own trailer and
> feel that it works quite well.
> 
> "The Real Answer to Tire Pressure"
> "I worked for Michelin Tire Corporation for 7 years and Yokohama Tire
> Corporation for 11 years. I have given numerous tire seminars on tire
> maintenance and especially how to determine the correct tire pressures. So
> here goes."
> "The pressure on the sidewall of the tire is the maximum pressure at the
> published load at approximately 55 mph. (The speed can vary somewhat but it
> is not important for our discussion)."
> "The air pressure is required to support the load that the tire must carry
> in such a manner that the tire flexes at the designed place on the sidewall
> of the tire."
> "If the load on the tire changes then the air pressure should change
> accordingly to keep the tire flexing at the proper place."
> "The reason for correct air pressure is to prevent the tire from
> overheating. It was put together with heat and it will come apart the same
> way. An under inflated tire will eventually self destruct due to excessive
> heat build up. An over inflated tire will ride harshly and be more likely to
> burst upon impact. Sorry for the long explanation but here is the bottom
> line.
> To determine the correct air pressure, check the pressure when the tire is
> cold. Run the tire for several miles at highway speed. Stop and immediately
> check the air pressure in the tire. It should be higher than we cold but no
> more than 10% higher.
> Now here is the hard to believe part. If the pressure is more than 10%
> higher you must ADD AIR and test again. For example if you start with 50 psi
> cold. If the pressure is 60 when hot, you have exceeded the (10%) in this
> case, 55 psi maximum safe heat build up pressure. You must ADD AIR. In this
> case I would add 5 psi which would take the tire to 65 psi when hot. After
> you run the tire again you will find the pressure to actually drop because
> the tire will run cooler. The heat build up causes the tire pressure to
> increase when under inflated."
> "On the other hand, if the 50 psi cold pressure does not change when hot.
> You have more air than needed. You can remove 5 psi or so and test again
> when they return to cold. Like the next trip you take."
> "So a fully loaded rig will require more air in the tires than one with
> empty tanks and a light load on board. Always error on the side of over
> inflation. Thus the maximum sidewall pressure indicated on the tire is
> usually used. It usually is more than needed. Each axle has its own
> requirement based upon the load on that axle."
> 
> Written by "AccessMaster" on Airstream forums.com 04-11-2003, 10:11 AM
> 
> 
> Forrest

Very good information. Note the last sentence, "Each axle has its own
requirement based upon the load on that axle." As if there is a chance
axle loads of a trailer will not be equal. Just what I've been saying.

A tire pressure change from 55 psi to 65 psi means a temperature change
of 96 degrees F (starting at 68F). That's a lot of heat on a tire.
Shouldn't have to touch a tire to notice that much heat. That's
presuming there's not a lot of water in the tire to confuse the pressure
rise from raising the temperature of the water vapor.

- -- 
Gerald J.
Dr. Gerald N. Johnson, electrical engineer
WBCCI #5623, VAC
All content copyright.

------------------------------

Date: Mon, 2 May 2005 23:34:13 EDT
From: Hugheym@xxxxxxxxxx.com
Subject: Re: [VAL] tire pump

I carry a 12 volt air pump and have used it on numerous occasions to  inflate 
my trailer tires and the tow vehicles tires. 
Seems a simple solution for those times when a air hose is not handy.
 
 
 
 
Martin and Rachel  Hughey
WBCCI 10212, Vintage A/S
1969 International and 1961  Bambi

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End of VAL Digest V2 #236
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