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Aviation History
1957
1957 - 0210.PDF
212 FLIGHT FIRST PILOT GUNNER/ NAVIGATOR FORWARD-FUSELAGE TANK INTEGRAL FUEL TANKS AS.B RADAR BATTERIES AND OXYGEN EQUIPMENT ESCAPE CHUTE AUXILIARY POWER UNITS AND ELECTRONICS OIL TANK INTERCOMPRESSOR BLEED VALVE N.A.C.A. LEADING-EDGE" SLATS For Naval Attack: A3D SKYWARRIOR . . . Each main leg folds into a bay flanking the rear fuselage fuel cell. from 230,000 Ib/sq in steel with welded-on lugs. To the rearare a massive tail bumper and arrester hook, both of which are attached to the heavy keel longerons bordering the weapons bay.The latter, some 15ft in length, has simple doors hinged to strong box-section keel members. Ahead of the bay is a perforateddeflector, known as an "anti-buffet rake," which reduces turbu- lence and buffet when the weapons bay is opened at high speeds(see detail sketch). Further reference to the large drawing reveals that several ofthe main fuselage frames (which, like most body-skeleton mem- bers, are of top-hat section) serve several tasks. The diaphragmstation at the rear of the weapons bay forms the front support- wall of the rear fuel cell and also carries the attachments for themain undercarriage. Further aft another single frame bears the loads from the "barn-door" speed brakes, the twelve RATO(rocket-assisted take-off) bottles and the tail bumper. At the front of the aircraft, the nose bulkhead—an inwardly-dished diaphragmstabilized by vertical angle members—seals the pressurized flight deck, supports the front face of the forward tank and also bracesthe twin support-beams of the nose undercarriage. Flying controls are all powered hydraulically. The boost ratiosfor the elevators and rudder were chosen at a moderate value so that the A3D can, in emergency, be flown manually. For lateralcontrol an aileron boost-ratio as high as 40:1 was found to be essential, and the systems are therefore duplicated and irrever-sible. Loss of one system still leaves a ratio of 20:1, and there is also a "last-ditch" 2:1 manual stand-by circuit with which
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