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FUNDAMENTAL considerations which govern the power and fuel requirements, maximum speed, safety, and practical utility of types of VTOL aircraft are enumerated and discussed. The most interesting types of VTOL aircraft such as the helicopter are discussed and evaluated in regard to their probable applicability to the various fields of usefulness in view of these fundamental considerations. ...It is recognized that there is an advantage in the power-controlled approaches of VTOL aircraft from small airports under all weather conditions. It is realized that there is research still needed to make the VTOL a more satisfactory aircraft. ...It is realized that there is research still needed to make the VTOL a more satisfactory aircraft.

To achieve these requirements, a special type of aircraft had to be developed and it appears that the aircraft needed is the VTOL. This paper presents the reasons for selecting the Tilt-Wing VTOL over other types of VTOL's as being competitive in Commercial Air Transportation. ...A comparative study of the direct operating cost of a comparable helicopter and fixed wing aircraft with the VTOL is presented along with a comparison of block time and block speed. The operational aspects of the VTOL short haul transport are discussed and the advantages and disadvantages are presented for both commercial and military operations. ...The operational aspects of the VTOL short haul transport are discussed and the advantages and disadvantages are presented for both commercial and military operations.

A description is given of a medium-range transport with VTOL capabilities and its performance is compared with conventional aircraft.