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Gemini 8 stuck thruster
What was the location of the thruster that failed and caused gemini 8 to go
out of control? Was it on the capsule that reentered or one of the white adapter sections? If it was the adapter how did nasa figure out what happened since it would have been left in orbit or burned up on reentry? thanks joe |
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Gemini 8 stuck thruster
On Feb 17, 8:21 pm, "JOE HECHT" wrote:
What was the location of the thruster that failed and caused gemini 8 to go out of control? Was it on the capsule that reentered or one of the white adapter sections? If it was the adapter how did nasa figure out what happened since it would have been left in orbit or burned up on reentry? thanks joe It was roll thrust no. 8, one of the 25-pound Orbit Atitude and Maneuver System (OAMS) roll thrusters, that stuck. After they stopped the roll, Armstrong and Scott did some troubleshooting to isolate the bad thruster. The following diagram shows where the roll thrusters were located in the rear (white) adapter section. "http://history.nasa.gov/SP-4002/images/fig15.jpg" I don't believe that an absolutely certain cause for the stuck thruster was found, but failure analysis determined that that the most likely cause was an electrical short circuit that allowed current to flow through the coil of a solenoid valve. - Ed Kyle |
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Gemini 8 stuck thruster
JOE HECHT wrote: What was the location of the thruster that failed and caused gemini 8 to go out of control? Was it on the capsule that reentered or one of the white adapter sections? It was one of the eight Orbit Attitude Control Thrusters at the base of the equipment module: http://nssdc.gsfc.nasa.gov/planetary...ni_diagram.gif Pat |
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Gemini 8 stuck thruster
On Feb 18, 5:27 am, Pat Flannery wrote:
JOE HECHT wrote: What was the location of the thruster that failed and caused gemini 8 to go out of control? Was it on the capsule that reentered or one of the white adapter sections? It was one of the eight Orbit Attitude Control Thrusters at the base of the equipment module:http://nssdc.gsfc.nasa.gov/planetary...ni_diagram.gif Pat ......... shades of Apollo 1. |
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Gemini 8 stuck thruster
On Mon, 19 Feb 2007 21:28:20 -0600, scott wrote
(in article .com): On Feb 18, 5:27 am, Pat Flannery wrote: JOE HECHT wrote: What was the location of the thruster that failed and caused gemini 8 to go out of control? Was it on the capsule that reentered or one of the white adapter sections? It was one of the eight Orbit Attitude Control Thrusters at the base of the equipment module:http://nssdc.gsfc.nasa.gov/planetary...ni_diagram.gif Pat ......... shades of Apollo 1. Only in your deluded, paranoid fantasies. -- You can run on for a long time, Sooner or later, God'll cut you down. ~Johnny Cash |
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Gemini 8 stuck thruster
On Tue, 20 Feb 2007 07:23:48 -0600, Herb Schaltegger
wrote: On Mon, 19 Feb 2007 21:28:20 -0600, scott wrote ......... shades of Apollo 1. ....Well, well, well, mommie's little baby decided to crawl out from under his rock. Where've you been "scotty"? Out stalking NAA employees in drag again? Only in your deluded, paranoid fantasies. ....Yep. If only we could have both of them stuffed in a rubber room at the funny farm. Wouldn't matter whether they got help or not, at least they'd quit ****ing on Gus' memory. He really deserves better, which is probably why we jump "scott's" **** every time he opens his mouth and recites Betty's psychotic, paranoid dogma. OM -- ]=====================================[ ] OMBlog - http://www.io.com/~o_m/omworld [ ] Let's face it: Sometimes you *need* [ ] an obnoxious opinion in your day! [ ]=====================================[ |
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Gemini 8 stuck thruster
On Feb 18, 3:27 am, Pat Flannery wrote:
JOE HECHT wrote: What was the location of the thruster that failed and caused gemini 8 to go out of control? Was it on the capsule that reentered or one of the white adapter sections? It was one of the eight Orbit Attitude Control Thrusters at the base of the equipment module:http://nssdc.gsfc.nasa.gov/planetary...ni_diagram.gif Pat The "Gemini Technical Summary" document states which thruster had a problem and shows where it was located: http://ntrs.nasa.gov/archive/nasa/ca...1968016105.pdf PDF page 44 states that, "The problem was isolated to No. 8 OAMS thruster which fired continuously because its circuitry failed in an ON condition." PDF page 143 contains a diagram that shows where OAMS thruster No. 8 was located. From the diagram, it appears to be behind and to the lower left of Command Pilot Neil Armstrong, at the base of the Gemini Equipment Adapter section. It was one of the left roll thrusters. Rusty |
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Gemini 8 stuck thruster
Rusty wrote: From the diagram, it appears to be behind and to the lower left of Command Pilot Neil Armstrong, at the base of the Gemini Equipment Adapter section. It was one of the left roll thrusters. What screwed things up was that they were supposed to be fired in pairs set 180 degrees apart, firing just one meant the center of thrust didn't pass through the center of rotation of the spacecraft, so instead of simply rolling, it developed a wobbling motion. The Apollo SM thruster quads were a big improvement on this concept of control. If Gemini had been designed right, those roll thrusters should have been on the retro section with the other control thrusters, very near the center of mass of the whole spacecraft. Pat |
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Gemini 8 stuck thruster
Pat Flannery wrote:
If Gemini had been designed right, those roll thrusters should have been on the retro section with the other control thrusters, very near the center of mass of the whole spacecraft. But why would that matter? Unless roll thrusters are fired in opposition, there will be a net offset no matter where they are located because they are not (and cannot!) be designed to direct their net thrust through the vehicle's centre of mass. BTW, I would claim that Gemini was "designed right" with the sole exception of not having a method for intravehicular transfer of crew between docked vehicles. However, back in 1961, it wasn't even remotely a requirement. (And Block I Apollos didn't have that capability either.) -- Dave Michelson |
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Gemini 8 stuck thruster
On Tue, 20 Feb 2007 19:15:48 -0600, Dave Michelson wrote
(in article 83NCh.1073902$5R2.698651@pd7urf3no): Pat Flannery wrote: If Gemini had been designed right, those roll thrusters should have been on the retro section with the other control thrusters, very near the center of mass of the whole spacecraft. But why would that matter? Unless roll thrusters are fired in opposition, there will be a net offset no matter where they are located because they are not (and cannot!) be designed to direct their net thrust through the vehicle's centre of mass. Hence the concept of "moment" . . . :-) -- You can run on for a long time, Sooner or later, God'll cut you down. ~Johnny Cash |
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