Word: thrusters
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...while Gemini 8 was docked with the Agena that the joined vehicles suddenly began to tumble as if some attitude-control thrusters had gone amuck. Since the Gemini's thrusters were turned off and the Agena's could be seen firing, Armstrong assumed that it was the Agena controls that were at fault. After cutting off the Agena thrusters, he struggled for 10 minutes to bring the joined ships under control. Then he undocked, still unaware that the real trouble was a short circuit in Gemini's electronic control system that had caused its No. 8 thruster...
...range of the Coastal Sentry. "It's in a roll, and we can't seem to turn anything off," Armstrong informed the shipboard controller, who reported to Houston that Gemini was now "showing' pretty violent oscillations." It seemed to Armstrong that Gemini's No. 8 thruster -one of the small rockets used to turn or yaw the craft-had stuck open and was pushing the craft into an uncontrollable spin, which at one point reached a critical rate of a complete revolution each second...
...rest of Gemini 5's flight was far from smooth. Because of the loss of thruster fuel, Kraft ordered the astronauts to limit their use of the jets and go into a drifting, tumbling flight. They had to scrub some of the remaining photographic experiments that required them to use the thrusters to get into a picture-taking position. Ground control was also worrying about the fuel-cell system again. The process of generating electricity by mixing hydrogen with oxygen was producing much too much of that inevitable byproduct: water. Ground control feared that the spacecraft was running...
...tail fin for turning, a pair of flaps on the top of the aft section of the body for upward pitch and roll adjustments, and a single flap under the aft section for downward pitch. If angle of descent becomes too sharp, the pilot can fire the two small thruster rockets on board. Wings are not necessary to achieve stability and lift...
White confessed that during his "extravehicular activity," his 25-ft. tether gave him considerable trouble, kept tugging him toward the very spot he had been warned to avoid-the spacecraft's adapter section. There, two-foot-long plumes of burning fuel shot out from the thruster rockets fired by McDivitt to stabilize the capsule, and White at times drifted as near as five or six feet above them...