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The investigation of the design essentials for the VTOL aircraft in military use is the preliminary step in developing this type of transport for commercial flight. ...This paper shows how the characteristics of VTOL may lead to wide public acceptance, not only because noise is minimized and safety enhanced, but also because distance flights coordinated with VTOL local service can result in much time saving and increased convenience. ...This paper shows how the characteristics of VTOL may lead to wide public acceptance, not only because noise is minimized and safety enhanced, but also because distance flights coordinated with VTOL local service can result in much time saving and increased convenience.

STOL and VTOL craft will be utilized.

The short-to-medium haul VTOL passenger market growth has been limited by factors of equipment performance capability, equipment operating economics, and Federal constraint. ...In this study, the local and intercity markets susceptible to VTOL passenger movement are assessed, aircraft equipment requirements developed, and flight operational concepts described. ...It is indicated that a 40-50 place V/STOL passenger aircraft, operated VTOL normally, might provide competitive, subsidy-free transportation in the 1970 time period.

The shrouded propeller is a natural propulsive device for VTOL. This has been proved by a demonstration of good VTOL capability in actual flight by a shrouded propeller VTOL airplane. ...This has been proved by a demonstration of good VTOL capability in actual flight by a shrouded propeller VTOL airplane. Thorough theoretical studies and tests of the shrouded propeller have been made.

Advance study is vitally necessary in the fields of VTOL/ STOL performance.stability and control, and instrumentation and/ or displays for terrain clearance and avoidance during high speed, low altitude flight.