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NEW YORK AIRWAYS, INC. -7- demonstrated in fixed-wing aircraft applications. The conventional single-engine helicopter take-off technique of acceleration at ground level to the climb-out speed is no longer required with the multi-turbine helicopter since there is no height-velocity envelope limitation under normal operations for the engine inoperative flight condition. (Reference Chart 3.) In collaboration, New York Airways, the Vertol Division of the Boeing Company, and the Sikorsky Aircraft Division of United Aircraft have developed, through several years of actual flight research, vertical take-off, climb and aborted takeoff techniques. These tests were conducted under simulated conditions of gross weight, power and disc loadings to assure the feasibility and safety of these maneuvers. The vertical take-off technique involves an initial vertical climb (the fuselage remains in a horizontal attitude) rising to a critical decision altitude, at which point, in the event of one-engine failure, the pilot has the option of descending back to the heliport, under complete control, or continuing his departure flight track by sacrificing altitude
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