Re: [amsat-bb] Analysis of AO-40 Telemetry From BipropellantEngine Burn Attempts

[Jon Ogden <na9d@xxxxxxxxxxxxxx>]

on 12/21/00 12:23 PM, Phil Karn at karn@ka9q.net wrote:

>> rises from 0 to 15.6 Bar. Also the helium tank pressure may have
>> cooled from 10.7 to 8.1 C.  (This may also be due to 'stirring' of
>> tank contents caused by acceleration.) Later indications from
> 
> No, just think of "adiabatic expansion".
> 
> AO-10 was never able to do a second burn because the helium bottle
> lost pressure after the first burn. The theory was that during the
> first burn, which went long because of a wiring error in the LIU,
> adiabatic expansion cooled the helium bottle enough for differential
> contraction of the bottle cap to lose its seal, allowing the helium to
> escape.

Phil,

I thought AO-10 had its problems because it collided with the launcher
vehicle this damaging the engine.

Jon


-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

"A life lived in fear is a life half lived."

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