Tire inflation pressure

45 lbs??? 55 lbs for the nose gear??? That seems awfully high. Those tires
will be hard as a rock. I guess I'd prefer a little softer tire to land on. I
rarely put in more than about 15 to 20 lbs. 5 lbs will "get the sidewall off
the ground."

(VideoFlyer) wrote:

45 lbs??? 55 lbs for the nose gear??? That seems awfully high. Those tires
will be hard as a rock. I guess I'd prefer a little softer tire to land on. I
rarely put in more than about 15 to 20 lbs. 5 lbs will "get the sidewall off
the ground."

You obviously don't have experience with 5.00-5 tires on a 2,250 lb
gross weight canard aircraft or you wouldn't be spewing such
ignorance. The pressures I gave are correct for the tires, weight,
and configuration. 15 to 20 psi 5.00-5 tires would be grossly under
inflated on that airplane. The nose tire inflation of 55 psi is also
correct. Think before you post, people.

- anon

anon wrote:

(VideoFlyer) wrote:

45 lbs??? 55 lbs for the nose gear??? That seems awfully high. Those tires
will be hard as a rock. I guess I'd prefer a little softer tire to land on. I
rarely put in more than about 15 to 20 lbs. 5 lbs will "get the sidewall off
the ground."

You obviously don't have experience with 5.00-5 tires on a 2,250 lb
gross weight canard aircraft or you wouldn't be spewing such
ignorance. The pressures I gave are correct for the tires, weight,
and configuration. 15 to 20 psi 5.00-5 tires would be grossly under
inflated on that airplane. The nose tire inflation of 55 psi is also
correct. Think before you post, people.

Consider that a pneumatic tire supports the weight by the air pressure
that's in it - and that the contact patch of the tire is approximately
the weight on the tire in pounds divided by the pressure in psi. That
means on the hypothetical plane above (2,250 pounds, 15psi), the
contact patch (total) for the three tires would be around 150 square
inches. That's 50 square inches per tire, which on a 5.00 tire is
otherwise known as "a flat".

Mark Hickey

Well....you're right, -anon. I obviously have no experience with 5:00-5 tires
on a 2250 lb gross weight canard aircraft or I wouldn't be "spewing" such
ignorance. But you might notice that I didn't say in my post that 15-20 lbs was
the correct, or even recommended, pressure. I am sorry to have contaminated
this group with an opinion, an observation and personal experience. Mea culpa,
mea culpa.

My experience with 5:00-5 tires is on much lighter aircraft. And while I
didn't mean to be "spewing ignorance" my experience nonetheless is that
pressures of 45-55 lbs makes the tires on my Rans pretty hard. If you would
like to tell me that my experience is not valid somehow, feel free.

To the original poster...if you want truly accurate information on this
newsgroup, "anon" is the person you want to consult. If you're looking for
feedback from other people interested in this hobby, better check with "-anon"
as well...just so you don't get splattered with more "spewed ignorance."

Flyer (foot firmly implanted in mouth)

"VideoFlyer" wrote in message
...
45 lbs??? 55 lbs for the nose gear??? That seems awfully high.
Those tires
will be hard as a rock. I guess I'd prefer a little softer tire to
land on. I
rarely put in more than about 15 to 20 lbs. 5 lbs will "get the
sidewall off
the ground."


It would depend on the all up weight of the aircraft, our Rallye 100
weighs in at a gross weight of 1700 lbs and the tire pressures are 21
in the nose wheel and 25 in the mains.
--

..
--
Cheers,
Jonathan Lowe
whatever at antispam dot net
No email address given because of spam.
Antispam trap in place

Use 8 ply tires for the mains, they're only a couple of bucks more.

On Fri, 07 Nov 2003 13:49:18 -0500, anon wrote:

(Paul Lee) wrote:
:
:Thanks for the leakage comments... but anybody know about the
:proper tire pressure? Or is that a mystery?
:
:45 psi for mains and 55 psi for the nose. Use six ply tires for the
:mains. Check pressure 12+ hours after initial inflation and add air
:if necessary. After that, pressure loss will be due to
:leakage/diffusion.
:
:The 70 psi nose tire pressure suggested by another poster is not only
:needlessly high but is over the maximum pressure specification for
:most 10x3.50-4 tires (1). Another poster's comment to "blow 'em up
:until the sidewalls come off the ground" is, of course, idiotic.
:
:Tire And Rim Association tire pressure chart:
:http://www.desser.com/pressurechart.html
:
:- anon
:
:1: The ply rating is an indication of tire strength and does not
:necessarily specify the actual number of carcass plies within the
:tire. The term is used to identify the maximum rated static load
:capability and corresponding inflation pressure applicable to specific
perational requirements.

I put 8 ply recaps on my Ercoupe once and it raised the plane about an
in. off the ground and even with no air in the tire,it would not go
flat.It did give me more prop clearance but a rough ride.I just did it
because my buddy told me that I would not have to worry about flats any
more and I have been alone on some strips with no help and had to put a
bunch of rags in the tire to get home.Not legal but it worked and I will
deny it later(smile)

Another poster's comment to "blow 'em up
until the sidewalls come off the ground" is, of course, idiotic.

Hmmm, frivolous and a bad joke maybe but idiotic??
You remind me of the guy that came over to the hangar looking for an air
bottle. When I handed him a bicycle pump, he wanted to know how it clamped onto
the valve stem. Then proceeded to tell me what pressures to use on the
oxy-acytelene tanks.
You cant find your ass with both hands but you are first in line to tell
everybody else how to do it.
Soooo, screw you, you pompous, arrogant, anonymous coward, net-nazi.

Warren,
WWII, Korea and
The Battle of Norfolk

S (Whunicut) wrote:

Another poster's comment to "blow 'em up
until the sidewalls come off the ground" is, of course, idiotic.

Hmmm, frivolous and a bad joke maybe but idiotic??

Yes, idiotic.

- anon

anon wrote:

S (Whunicut) wrote:

Another poster's comment to "blow 'em up
until the sidewalls come off the ground" is, of course, idiotic.

Hmmm, frivolous and a bad joke maybe but idiotic??

Yes, idiotic.

- anon

n o t n e c e s s a r i l y

Trivial in this case, as the tires were not alleged to have gone flat.
However, it is a frequently employed method to protect the wheels, and
sometimes the tires, while the parts (tubes in this case) are obtained.

IIRC, no assertion was made that this was an adiquate temporary service
for flight, or even ground operation.

Peter