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Date: Fri, 07 May 2010 20:47:46 -0400
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From: Lorn H Olsen <lorn@dynacomm.us>
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Subject: Desser Tires Air Pressure
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I just landed at St Simons Island (KSSI) and had a flat. This landing =
and the prior landing were smooth although this one was a little fast. =
They have just cut grooves in the KSSI runway giving great traction but =
also spinning the tires instantly up to 90.

The right tire still had 44 lbs psi of nitrogen. I assume that the left =
(before the flat) had the same pressure. Neither of the tires looked low =
prior to the flight.

The flat was the same type that I have had in the past. The inside of =
the tube right in the middle there is a very small leak. I am bringing =
the tire home and will have it examined under a microscope to see if we =
can see what caused the problem.

I got the tires and tubes directly from Desser. They are about 1 year =
and have about 120 landings.

Remember that my calculation show that my empty weight has approximately =
400 lbs on the mains and nose. When at 1,900 lbs gross, there is about =
320 lbs on the nose and 790 lbs on the mains. The Desser tires are rated =
for 500 lbs at 70 psi.

I am thinking that the tube is slipping/rubbing against the tire at =
pressures below 40 psi causing the small holes in the side of the =
inner-tube. I use talc on the tube. This time I also used talc on the =
tire to seat it on the tube. The tire seated very easily but I am not =
sure whether this will cause slipping in the future.

Can anyone help me with a recommendation as to the tire pressures that =
they are keeping in both the mains and the Nose.

--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,700 hrs, N31161, Y47, SE Michigan