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

[Phil Karn <karn@xxxxxxxx>]

>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
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