Astrobotic PM-1 mission, CLPS mission with NASA and commercial payloads |
Astrobotic PM-1 mission, CLPS mission with NASA and commercial payloads |
Feb 4 2022, 03:12 AM
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Solar System Cartographer Group: Members Posts: 10186 Joined: 5-April 05 From: Canada Member No.: 227 |
I am starting a new thread for this mission which should fly this year.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 14 2024, 05:58 PM
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
Without a schematic of the propulsion system, it's really difficult to intuit what may be happening. Having done a little digging, apparently even the ACS thrusters are biprop (MMH doesn't work as a monopropellant, the spacecraft I'm familiar with that used dual-mode monoprop/biprop used pure hydrazine.)
Normally the large pressure gradient between the helium tank and the rest of the system would prevent any migration back into the helium tank, but if the pressure is equalized then all bets are off. Systems that aren't so mass-constrained have one-way check valves to keep migration from happening anyway (see Figure 1 in https://www.researchgate.net/publication/23...ion_Performance ) but it seems that Peregrine cut out anything that wasn't absolutely required. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Lo-Fi Version | Time is now: 6th June 2024 - 06:19 AM |
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