Search results
Results from the WOW.Com Content Network
The Apollo Command Module had a set of twelve hypergolic thrusters for attitude control, and directional reentry control similar to Gemini. The Apollo Service Module and Lunar Module each had a set of sixteen R-4D hypergolic thrusters, grouped into external clusters of four, to provide both translation and attitude control. The clusters were ...
RCS quad containing four R-4D thrusters, as used on the Apollo Service Module. Four clusters of four reaction control system (RCS) thrusters (known as "quads") were installed around the upper section of the SM every 90°. The sixteen-thruster arrangement provided rotation and translation control in all three
The R-4D is a small hypergolic rocket engine, originally designed by Marquardt Corporation for use as a reaction control system thruster on vehicles of the Apollo crewed Moon landing program. Aerojet Rocketdyne manufactures and markets modern versions of the R-4D.
R-4D (MMH/NTO) – 100 lbf (exact thrust depends on variant) hypergolic thruster, originally developed by Marquardt as RCS thrusters for the Apollo SM and LM. Currently used as secondary engines on the Orion European Service Module, and as apogee motors on various satellite buses. MR103G — 0.2 lb hydrazine monopropellant thruster
Some devices that are used or proposed for use as thrusters are: Cold gas thruster; Electrohydrodynamic thruster, using ionized air (only for use in an atmosphere) Electrodeless plasma thruster, electric propulsion using ponderomotive force; Electrostatic ion thruster, using high-voltage electrodes; Hall effect thruster, a type of ion thruster
The Apollo Command Module reentered with the center of mass offset from the center line; this caused the capsule to assume an angled attitude through the air, providing a sideways lift to be used for directional control. Rotational thrusters were used to steer the capsule under either automatic or manual control by changing the lift vector.
US stocks ended Friday in the red, closing out a lackluster week despite a year of historic highs.. The Dow was lower by 333 points, or 0.78%, after the closing bell.
The final midcourse correction of the mission (MCC-7) or the corridor control burn, was a 21 s RCS thruster, slowing them down by 5.6 ft/s (1.7 m/s). Now all that was left for them to do was separate from the service module and assume the blunt-end-forward orientation. The CM's own RCS system was pressurized and the VHF radio link