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November 15th 04, 06:18 PM

PAMNO (N2EY) wrote in message ...
In article ,
(Brian Kelly) writes:

Temperatures
at 100,000 MSL generally range from -50ºF to -150ºF "depending".
Lightweight (ounces) high-end ($500 class) consumer-level GPS
receivers are rated to temps only down to Øº-5ºF and 30,000 MSL max.
altitude. Then comes the same kinds of limits on the rest of the
electronics you're visualizing. How would engineer your way around
these limitations on a freeware budget?

Looks like a big challenge may be the engineering of an insulated airtight
container that doesn't weigh much.

There's no new ground here. PAMNO (N2EY) wrote in message ...
In article ,
(Brian Kelly) writes:

Temperatures
at 100,000 MSL generally range from -50ºF to -150ºF "depending".
Lightweight (ounces) high-end ($500 class) consumer-level GPS
receivers are rated to temps only down to Øº-5ºF and 30,000 MSL max.
altitude. Then comes the same kinds of limits on the rest of the
electronics you're visualizing. How would engineer your way around
these limitations on a freeware budget?

Looks like a big challenge may be the engineering of an insulated airtight
container that doesn't weigh much.

There's no new graound here, it's more like a pile of labor than a
real design challenge. If the instrument capsule is sealed at sea
level and flown to 100,000 feet every six inch by six inch x by 3/4
inch thick patch of the foam board will have to survive a 470+/- pound
outward load. Which I doubt will work. So the capsule should be sealed
then evacuated to say 30,000 feet to get those stresses down. I can
take it anywhere from here but I ain't.

Sometimes dumb luck and enthusiasim gets the driveway mechanics there
faster than applied physics does.

73 de Jim, N2EY

w3rv