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The offset flapping hinges and hydraulic servos gave more positive flight control under differing loading conditions, isolated the flight controls from vibration, and lessened control forces; the H-19 could be flown with only two fingers on the cyclic control.The YH-19 prototypes featured a blunt aft fuselage and a single starboard-mounted horizontal tailplane with a small vertical fin at its outboard end.Initial production models added a large fillet-like fin behind the fuselage and under the tailboom, and the tailplane configuration was changed to an inverted "V" shape. Navy service with this powerplant, so the aircraft was re-engined with a 700 hp (522 k W) Wright R-1300-3 radial which the U. Navy found to be adequate in an air-sea rescue role; the H-19B, HO4S-3, HRS-3, and subsequent models would use this powerplant.Early H-19 and HO4S variants were powered by a Pratt & Whitney R-1340-57 radial rated at 600 hp (472 k W) and used a centrifugal clutch that automatically engaged the main rotor when a preset engine speed was reached. The R-1300 models also used a single horizontal tailplane in place of the early inverted "V" style, and a new hydro-mechanical clutch gave smoother and more rapid rotor acceleration during clutch engagement and allowed the engine to be started and operated at any speed while disengaged from the transmission and rotors.The H-19 Chickasaw holds the distinction of being the US Army's first true transport helicopter and, as such, played an important role in the initial formulation of Army doctrine regarding air mobility and the battlefield employment of troop-carrying helicopters.
Major innovations implemented on the H-19 were the forward placement of the engine below the crew compartment and in front of the main cabin, the use of offset flapping hinges located nine inches (229 mm) from the center of the rotor, and the use of hydraulic servos for the main rotor controls.To reduce their exposure, men and launchers were moved twice a day.HRS-1 helicopters carried four rocket launchers and extra rockets as external cargo with the crew in the cabin. The helicopter was widely exported, used by many other nations, including Portugal, Greece, Israel, Chile, South Africa, Denmark and Turkey. Marine Corps versions were all redesignated as H-19s like their U. This was followed by delivery of the first YH-19 to the U. Air Force on 16 April 1950 and delivery of the first HO4S-1 helicopter to the U. An additional 447 were manufactured by licensees of the helicopter including Westland Aircraft, the SNCASE in France and Mitsubishi in Japan.