Engine for Trans-Lunar Shuttle
I based the reference mission hardware on using the RL-10 engine for
trans-lunar propulsion even though it was a bit more powerful than we
really need to do the job. Here are some specs for the folks working
on spaceship designs:
RL-10 Engine: RL-10-A-3-3A
rl_10_eng_wt 305 lb
rl_10_mixture 5 5:1 O:H wt
rl_10_thrust 16,500 lb/engine
rl_10_isp 444.4 sec
rl_10_ch_press 475 psi
rl_10_max_firings 25 max
rl_10_eng_time 1.25 hours
rl_10_eng_diam 39.54 inches
rl_10_eng_len 70.1 inches
Reference: NASA Publication NP-133 "Accessing Space," NASA 1990
Based on the DC-X experience, the RL-10 is a bit more robust than
even its specifications indicate; but we'd expect the specifications
to be a bit conservative.
About the Ascent Stage: Besides the decision to use hypergolic fuel
for that one stage, you can see why I didn't want to use an RL-10 to lift a
1500-lb vehicle off the moon. The RL-10 comes in a throttleable version,
but 10 g's is a tad bit more acceleration margin than we need.
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