Re: what is orbital speed around the moon?



Derek Lyons wrote:
Sure - but how big were those motors compared to a useful
circularization motor?

Based on the small kick the Shuttle's OMS pods give it to do its OC maneuver despite the mass of the vehicle, it shouldn't take much; the OMS-2 burn on STS-41C lasted 122 seconds and changed the orbiter's velocity by 160.5 fps:
http://www.jsc.nasa.gov/history/shuttle_pk/pk/Flight_011_STS-41C_Press_Kit.pdf
The Moon shell's velocity change shouldn't have to be very large, particularly given the low velocity needed to orbit the Moon.
Just guessing, around 1/5 to 1/6 that, or around 26-30 fps.

Pat
.

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