Encyclopaedia of Chess Openings - Queen's Gambit (D44) by Chess Informant

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The controller receives commands from the vehicle's guidance and navigation computers for the checkout, start, thrust-level requirements (throttling), and shutdown. The controller, in turn, performs the necessary functions to start, change from one thrust level to another within 1 -percent accuracy, and shut down as defined by the commands from the vehicle. In addition to controlling the engine, the controller performs self-tests and switches to the backup computer channel and its associated electronics in the event of a failure.

2-37 Thecylindricalsectionconsistsof four barrel sections joined by three major ring frames using fusion butt welds. Each of the barrel sections is made from eight stiffened skin panels. The thickness of the skin panels used in both propellant tanks varies according to load requirements. The skin panels also Include provisions for mounting support fittings for external propulsion system lines and for electrical conduits. Welded in the aft barrel section are two Iongeron sections and other structural fittings that distribute Orbiter and SRB loads.

Most of the insulation consists of a material called nitrile butadiene rubber (NBR), which has been used in previous rocket motors. The insulation is applied in sheets that stick together and that are laid down in such a way that the insulation adheres to an adhesive that has been applied to the inside of the case walls. 5 hours. After cooling, the insulation becomes a solid material firmly bonded to the case wall. In the dome of the aft segment, carbon fiber-filled ethylene propylene diene monomer (EPDM) is applied over the NBR.

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