Postulated mission requirements, based on the U. S. Marine Corps long range concept (1975-85), which envisions tactical airborne assaults and subsequent operations up to 500 nautical miles inland from a seaborne logistic base, indicate a need for advanced troop/cargo V/STOL aircraft. A mix of three different aircraft sizes appear optimum: (1) a light, 1,500-pound payload V/STOL aircraft for utility and light tactical missions, (2) a medium, 4,000-pound payload V/STOL aircraft to carry an infantry squad during initial assault landings and subsequent tactical operations, and (3) a heavy, 14,000-pound payload V/STOL aircraft to carry the majority of men, equipment, and supply buildup during assaults and the logistic resupplies in subsequent operations. The tilt rotor V/STOL concept is recommended as most effective for the light and medium V/STOL aircraft; the stowed rotor concept is recommended for the heavy aircraft. These aircraft use rotor lift systems for take off and landing, and their operation from ships to sites ashore will pose no extraordinary operational requirements over current helicopters. Their greater speed and economy of operation over long ranges give them a decided advantage over helicopter type of aircraft. (Author)


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