the g (gravitational accel.) used with "decrement mass"

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the g (gravitational accel.) used with "decrement mass"

Postby AsteroidX » Tue Mar 29, 2016 3:07 pm

I have a question about the value of g (gravitational accel.) that should be used on a finite burn for a chemical thruster when "decrement mass" is selected. I have been using 9.81 m/s^2 because it is the same value I used in my other calculations, even though when the maneuver takes place, the g value is not actually 9.8. I am doing this because I am assuming that g is just a conversion constant from weight to mass. Does anyone know if that is correct?

I also assume that I could use a different value for g, such as 2.7 m/s^2, but if I did, I would have to make sure I used that for all my calculations involved with that specific maneuver. This would then need to be the same process for all other maneuvers at different g values.

This is a really important issue because it affects the mass flow rate that gmat is calculating, and gmat will use way more or way less fuel than it actually should. So I just want to double check that I am not way off in my assumption that i can use 9.8 for g.

Let me know what your thoughts are.

Thanks! :D
AsteroidX
 
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