piclist 2001\01\19\035208a >
Thread: Rocket Altimeter Project
www.piclist.com/techref/index.htm?key=rocket+altimeter
picon face BY : Bob Ammerman email (remove spam text)



> >Pressed black powder motors such as the estes c6-5 are known to be
> >sensitive to temperature cycling.  The paper casing and the black powder
> >slug have slight different thermal expansion ratios, and repeated or
> >extreme temperature changes can cause the propellant to separate enough
> >from the casing to allow the flame front to burn between them.  When this
> >happens, the slug ignites all over, overpressurizes the casing, and
> >(usually) flies out the front of the motor/rocket like a roman candle
star.
> >There's a rule of thumb that goes something like "don't launch at a motor
> >temperature more than 30F lower than the max temperature the motor has
been
> >stored at."  (Didn't the original message come from someone up at
Cornell,
> >where I imagine it's very cold at the moment?)

Too bad NASA didn't know this when they launched Challenger :-(

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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