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MSS Q&A Thread
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Space Station Member ![]() ![]()
Joined: Thu Mar 06, 2008 9:22 pm
Posts: 266 ![]() |
Here's two more videos I put together of the restart, by the way:
http://www.youtube.com/watch?v=kqm48D5WZ6A http://www.youtube.com/watch?v=DhuEFCvUOoI |
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Space Station Commander ![]() ![]()
Joined: Thu Oct 27, 2005 7:44 am
Posts: 707 Location: Haarlem, The Netherlands ![]() |
Ben wrote: To hover, you want the engine thrust line right through the CG, and that line the same as the gravity vector. To move sideways, you have to get the CG off that vector, so the vehicle essentially "falls" in the direction you want it to go. (Disclaimer: Do try this at home, in a place without traffic, obstacles, or other dangerous situations, and be careful not to fall off. You might easily break something and if you do, I'm not responsible. If you are a minor, seek parental supervision, a lawyer, spiritual counseling, and make sure there is a doctor at the ready. After all, we have to think of the children. Or something, heck, I'm not an American so what do I know about disclaimers?) Congrats on the in-air restart by the way, looked pretty cool! _________________ Say, can you feel the thunder in the air? Just like the moment ’fore it hits – then it’s everywhere What is this spell we’re under, do you care? The might to rise above it is now within your sphere Machinae Supremacy – Sid Icarus |
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Space Walker ![]() ![]()
Joined: Wed Mar 07, 2007 3:30 am
Posts: 213 Location: USA ![]() |
Ben, Perhaps it is just that when you make those motions to begin a translation or a minor adjustment in position, you do it more aggressively than AA. Like the difference of taking off at a run versus a walk. Your last video has an example. Near the end when you recenter over the pad (34 second mark.)
I understand the physics of it and I am in no way insinuating that you are doing it wrong. It would take me a month of banging my head on a wall just to get the code right, let alone setting it to the proper values and interfacing with gps and IMUs. That would keep me busy for much longer. I am fully impressed at the very very least. I simply happen to prefer the more gentle corrections that AA uses under normal circumstances. Their last violent relight as the exception... If you watch the llc videos Scorpius barely tips noticeably to start and stop translation. You kind of tipped Xoie on her side to get going. It is not a question of which is using the correct algorithm. It is a question of which one my gentle stomach would want a ride on. Thanks for responding. Daniel |
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Spaceflight Trainee ![]() ![]()
Joined: Tue Jun 15, 2004 10:26 am
Posts: 44 Location: Switzerland ![]() |
I just noticed this tweet from IIIan:
Quote: So long Mojave, and thanks for all the fish! And just to outdo @wikkit I licked Xombie on my way out. Tastes of iron. So it appears that Masten has just lost its second key employee... Masten has had a very good development pace and according to themselves very interesting projects lined up. Are Ben and Ian's departures going to (significantly) affect the ability to keep this up and continue the projects? Does the job opening for a propulsion engineer mean that Jon is leaving shortly, too? Are these moves driven by them wanting to move out of Mojave or are they being "bought away" by competitors? Does this make it more difficult to recruit and/or keep replacements? Can this affect the future of the company? I'm wishing you the best in finding capable new employees. I'm hoping for the best, but slightly worried (perhaps not rightfully so). _________________ For every complex problem there is a solution that is clear, simple, and wrong. - Henry Louis Mencken |
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Space Station Member ![]() ![]()
Joined: Thu Mar 06, 2008 9:22 pm
Posts: 266 ![]() |
There's never just a push or just a pull, but in the end everyone votes with their feet.
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Moon Mission Member ![]() ![]()
Joined: Fri Jan 09, 2004 11:52 am
Posts: 1401 Location: Exeter, Devon, England ![]() |
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Moon Mission Member ![]() ![]()
Joined: Fri Jan 09, 2004 11:52 am
Posts: 1401 Location: Exeter, Devon, England ![]() |
After rigorous adherence to Masten's "modify, test, modify" philosophy, Xaero has finally been unleashed from the safety tether, and performed a successful free flight hover this week. Improvements to our control algorithms were validated under tether earlier in the week, followed by careful analysis of Xaero's flight performance. The result is a picture perfect 22 second hover flight.
http://www.youtube.com/watch?feature=pl ... w9TeBws_ds |
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Moon Mission Member ![]() ![]()
Joined: Fri Jan 09, 2004 11:52 am
Posts: 1401 Location: Exeter, Devon, England ![]() |
Nice!
http://www.youtube.com/watch?v=UpH3u3hi ... r_embedded Xaero vehicle rising to 444 meters and returning for a successful landing |
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Space Station Commander ![]() ![]()
Joined: Mon May 31, 2004 9:47 pm
Posts: 827 Location: Yerushalayim (Jerusalem) - capital of Israel! ![]() |
I used to read Robert Heinlein books when I was a kid - this is awesome.
_________________ “Once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return.” -Anonymous |
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Spaceflight Trainee ![]() ![]()
Joined: Sat Oct 07, 2006 6:44 pm
Posts: 43 Location: TN, USA ![]() |
Fantastic flight & great camerawork! Definitely a dream-like quality to the rocket re-entering the camera view of the launch pad at the end.
_________________ "The rockets are burning, the dreamers are at full swing/ And you know in your heart that the farsighted see better things." ~ "Farsighted" by Five Iron Frenzy |
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Moon Mission Member ![]() ![]()
Joined: Fri Jan 09, 2004 11:52 am
Posts: 1401 Location: Exeter, Devon, England ![]() |
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Space Walker ![]() ![]()
Joined: Sun Apr 30, 2006 10:55 am
Posts: 140 Location: Amsterdam ![]() |
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Space Station Member ![]() ![]()
Joined: Mon Feb 25, 2008 9:51 am
Posts: 455 Location: Vienna, Austria, Europe, Earth ![]() |
_________________ pride comes before a fall |
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