At 05:19 PM 12/4/02 -0500, you wrote:
>Saw one of these puppy's in Chino, CA. The bead area was about 2" thick, one
>HEAVVVY tire. Strange silver coloring.
>John
>----- Original Message -----
>Subject: RE: Small diameter front tires - some conclusions! Part 1
>> Jim;
>>
>> I see on pg 36 of the Goodyear Aviation catalog that an SR-71 takes a 27.5
>x 7.5 tire with a 22-ply rating. I wonder what its speed rating is?
>> Hmmmmm.......
>>
> IIRC: the "Strange silver coloring" is due to the addition of
powdered aluminum designed to raise the heat resistance of the
rubber compound, because of the air friction at speed.
(It soaks into the whole airframe)
Maximum ground speed rating on SR-71 tires 239 Knots (275 MPH)
source: SR-71A-1 manual ( the Dash one)
http://www.sr-71.org/blackbird/manual/1/index.htm
http://www.sr-71.org/blackbird/manual/appendix/a2-3.htm
and "liftoff" speed is around 210Kts (242 MPH)
touchdown is around 175 Kts (202 mph)
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/// what is needed. It isn't that difficult, folks.
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