ullage motor造句

例句与造句

1. They also aided stage separation, and acted as ullage motors.
2. Engines devoted to this purpose are called ullage motors; sometimes reaction control system thrusters are used.
3. The fourth stage then coasted until one hour and fifty seconds after launch, when it fired its ullage motors in preparation for ignition.
4. Ullage motors are typically very small; research shows that accelerations of the order 0.001 g are needed to avoid excessive gas intake.
5. Ullage motors are also commonly employed on deep-space missions where a liquid rocket needs to start a burn after traveling in micro-gravity.
6. It's difficult to find ullage motor in a sentence. 用ullage motor造句挺难的
7. Some vehicles use other techniques to hold liquid at the inlet, as once the main engines are ignited, ullage motors are no longer required.
8. For the first seven manned Apollo missions only four ullage motors were used on the S-II, and they were eliminated completely for the final four launches.
9. The first and second stages were connected by an interstage structure containing four Siskin IB separation and ullage motors, which separated and ignited seven seconds after the first stage had cut off.
10. The second stage ( S-II ) of the Saturn V rocket used in the American Apollo program used four ( originally eight ) ullage motors located on the aft interstage skirt.
11. One of the ullage motors failed to fire, and when the main engine ignited for a four-minute burn to place the spacecraft into heliocentric orbit, the stage began to tumble out of control.
12. For the first two unmanned launches, eight solid-fuel ullage motors ignited for four seconds to give positive acceleration to the S-II stage, followed by start of the five J-2 engines.
13. The firing of the ullage motors is used during stage separation of rocket and / or stabilization of a rocket when there are brief reductions in acceleration which could allow the liquid propellant to float away from the engine intakes.
14. On the 500 series this was reduced to two, and two small APS ( auxiliary propulsion system ) thruster modules were added as ullage motors for restarting the J-2 engine and to provide attitude control during coast phases of flight.
15. "' Ullage motors "'( also known as "'ullage engines "'or "'ullage rockets "') are relatively small, independently fueled rocket engines that may be fired to accelerate the rocket prior to main engine ignition, when the vehicle is in a zero-g situation.
16. NASA had originally planned to direct the S-IVB into a solar orbit, but an extra long burn of the ullage motors meant that venting the remaining propellant in the tank of the S-IVB did not give the rocket stage enough energy to escape the Earth Moon system, and instead the stage ended up in a semi-stable orbit around the Earth after passing by the Moon on November 18, 1969.
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