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SpaceX Dragon spacecraft for low cost trips to the Moon.
On Feb 3, 6:06*am, Alan Erskine wrote:
On 2/02/2012 8:54 PM, Robert Clark wrote: * You can send it to this email address. What are you using for your Earth departure stage and lunar lander stage? * *Bob Clark Forgot to add - Nothing exists that's powerful enough for what I call a Trans-Lunar injection (see, nothing original there either) stage, but I've used two MB-60/RL-60 engines. I looked over your presentations. Looks good. I definitely think your low cost estimates to go back to the Moon are doable. However, about your Trans Lunar Injection stage, my understanding is that since that is launching from LEO in zero G, you don't need the engine thrust to exceed this upper stage's gross mass. Usually in fact for upper stages it does not, even for stages sending a satellite to GEO, which is a comparable delta-V requirement to that of sending a satellite to low lunar orbit. Bob Clark |
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SpaceX Dragon spacecraft for low cost trips to the Moon.
On 9/02/2012 6:04 AM, Robert Clark wrote:
On Feb 3, 6:06 am, Alan wrote: On 2/02/2012 8:54 PM, Robert Clark wrote: You can send it to this email address. What are you using for your Earth departure stage and lunar lander stage? Bob Clark Forgot to add - Nothing exists that's powerful enough for what I call a Trans-Lunar injection (see, nothing original there either) stage, but I've used two MB-60/RL-60 engines. I looked over your presentations. Looks good. I definitely think your low cost estimates to go back to the Moon are doable. However, about your Trans Lunar Injection stage, my understanding is that since that is launching from LEO in zero G, you don't need the engine thrust to exceed this upper stage's gross mass. Usually in fact for upper stages it does not, even for stages sending a satellite to GEO, which is a comparable delta-V requirement to that of sending a satellite to low lunar orbit. Bob Clark I'll have a look at it. If that's the case and you are right, it's a big mass saving and further increases payload; that'd be very very handy! |
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