Hayabusa - The Return To Earth, The voyage home |
Hayabusa - The Return To Earth, The voyage home |
Nov 28 2005, 03:08 PM
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Member Group: Members Posts: 510 Joined: 17-March 05 From: Southeast Michigan Member No.: 209 |
...starting a new thread for Hayabusa's sampling feedback and the return voyage.
After its nail-biting success in November, will there be enough fuel for the Falcon to make it home? -------------------- --O'Dave
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Dec 9 2005, 05:17 PM
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#2
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
Hope that Hayabusa has a match fire on their side for just in the case that the ion engine won't also be able to be ignited....
I am pessimist of a good trail of "mishapes". Rodolfo |
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Dec 9 2005, 07:11 PM
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#3
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Member Group: Members Posts: 624 Joined: 10-August 05 Member No.: 460 |
Since the xenon was not intended to be used as an attitude control gas, Are they using a venting valve to adjust the spin and attitude, or can they run zenon into the attitude control system?
In either case, the calculations are quite complex: They would have to maintain a slow rotation rate, and vent the gas at just the precise moment for the right percentage of the roll to adjust the tilt. It would take a very careful trial-and-error assessments to do this (the ultimate $170million dollar video game...and a lot of Lipovan |
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Dec 12 2005, 08:35 PM
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#4
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Member Group: Members Posts: 510 Joined: 17-March 05 From: Southeast Michigan Member No.: 209 |
QUOTE (The Messenger @ Dec 9 2005, 02:11 PM) Since the xenon was not intended to be used as an attitude control gas, Are they using a venting valve to adjust the spin and attitude, or can they run zenon into the attitude control system? From Matsuura's blog, it sounds like they're venting the xenon through the ion engine nozzles: QUOTE NHK How is the attitude control by xenon gas, concretely? Kawaguchi: The vehicle has four ion engines, and the orifice of each engine has a neutralizer with four nozzles per engine in order to neutralize the jet gas electrically. The nozzles are openable and closable. By opening or closing the nozzles to emit neutralized xenon gas jets, we are controlling the attitude. Its propulsion force is very small. Kawaguchi goes on to say that if they are forced to use xenon for attitude control on the trip back, they'll need to stop the ion engines every time they need to adjust attitude, then re-start the engines for thrust afterward. That will be a time consuming process and quite an exercise in patience. -------------------- --O'Dave
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