John, can we have approximate figures for the planned X Prize flight of the Armadillo vehicle?
The numbers I currently have are the following:
tank volume - 850 gallons tank weight - 1 lb per gallon thrust - 4 engines, 1000 lbf each acceleration time - 95 seconds confirmed Isp - 140 s
>From above, the take-off fuel weight should be about 2700 lbs, tank weight - about 850 lbs. And the total thrust of 4000 lbs... the mass budget doesn't seem to be right.
What am I missing?
Thank you very much,
Alexander
The 1000 lbf engines are just for pre-launch-license testing. The 12" diameter engines should make 4x the thrust.
Total vehicle dry mass is about 2200 lb, and it can hold 8500 pounds of propellant when using a pressurization system instead of tank blowdown.
We already saw 145 Isp on a small engine, so I expect that we will make 150 in the final large engines, which goes to 170 vacuum.
The acceleration time involves some throttle changes, and a partial blowdown.
We have a 1600 gallon tank on order, in case things don't work out with the smaller tank.
John Carmack
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