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This paper reviews the benefits to be derived from the implementation of a successful large scale VTOL passenger service and examines various studies, including the Northeast Corridor VTOL Investigation, which show that suitable aircraft will be available starting in the middle 70's, and that VTOL service can be economically attractive if an operating environment is created that is optimized for VTOL aircraft. ...This paper reviews the benefits to be derived from the implementation of a successful large scale VTOL passenger service and examines various studies, including the Northeast Corridor VTOL Investigation, which show that suitable aircraft will be available starting in the middle 70's, and that VTOL service can be economically attractive if an operating environment is created that is optimized for VTOL aircraft. ...This paper reviews the benefits to be derived from the implementation of a successful large scale VTOL passenger service and examines various studies, including the Northeast Corridor VTOL Investigation, which show that suitable aircraft will be available starting in the middle 70's, and that VTOL service can be economically attractive if an operating environment is created that is optimized for VTOL aircraft. If an optimized environment is not created, the implementation of successful VTOL service is very doubtful.

The different features and characteristics of seven varieties of VTOL aircraft are defined and discussed. Basically, the future for all VTOL vehicles hinges on the recognition of the need to select the proper type for a specific role. ...Compounding the two, he predicts very high cost for a highspeed VTOL. Thus the development of the low-speed helicopter necessarily emerged first. Although the evolution of VTOL vehicles has been slow and difficult, progress continues toward the original goal of a safer more effective vehicle for transportation through the air. ...Although the evolution of VTOL vehicles has been slow and difficult, progress continues toward the original goal of a safer more effective vehicle for transportation through the air.

The interrelationship of propulsion and airplane characteristics are based on subsonic considerations with emphasis on VTOL rather than STOL. The discussion is applicable to engines for VTOL aircraft of 0.3 to 0.9 Mach number and of the fixed wing category. ...This paper presents the effect of certain powerplant characteristics which must be considered in selecting the engine for a VTOL airplane. Selection factors discussed include: power matching, disc loading, aircraft control provisions, weight trades, and transition. ...Powerplant selection for VTOL demands timely attention to many details not existing in conventional aircraft.

REVIEW is given of some representative current configurations and propulsion arrangements for VTOL aircraft. Support is urged for a comprehensive development program on VTOL aircraft to cover the spectrum of aircraft flight speeds and promising propulsion arrangements. ...Efforts to reduce the landing and take-off distance requirements of conventional fixed-wing airplanes should continue, he feels, but it should not be accepted as an interim step toward or a substitute for true VTOL aircraft development.

Two types of service are recognized: metropolitan area service, connecting airports with downtown and suburban heliports -- which will continue to be done by helicopters; and inter-city downtown to downtown service employing high speed future type VTOL aircraft. Currently operating VTOL airlines are demonstrating the practicality of metropolitan area helicopter service. ...The objective of this paper is to show the probable composition of the VTOL Transportation System of the future and provide some specific predictions concerning some of its key elements. ...Advanced, high speed VTOL vehicles, introduced in the 1970’s will make extension of current routes possible to inter-city service.

The future acceptance and expansion of the VTOL, especially in its newer configurations, lies in its meeting the economics of the user. The commercial operator is especially influenced by these considerations.

Viable improvements must be undertaken without further delay. VTOL's, such as the S-65-200 compound aircraft, offer numerous advantages. They have minimal requirements for real estate, are compatible with the city-center ports needed for an effective short haul system, and are economically attractive, based on conservative calculations of costs and revenues, as the facts and figures in this paper show.

Noise from the aircraft may prevent the establishment of VTOL ports near population centers-the locations which can provide a significant contribution to mass transportation.

Piloted, moving-base simulations have been performed in the evaluation of several VTOL control system concepts during landings on a destroyer in adverse weather conditions. All the systems incorporated attitude control augmentation; most systems incorporated various types of translational control augmentation implemented either through aircraft attitude or, more directly, through the propulsion system (thrust magnitude and deflection).

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

HELIos is a single seat, three wheel, vertical take-off and landing (VTOL) flying car concept. It uses duct enclosed counter-rotating propellers. This technology eliminates the need for a tail rotor and makes the vehicle more compact.

The potentialities of VTOL systems are examined in terms of cost effectiveness. A comparison of VTOL, STOL, and CTOL systems shows that the operational cost effectiveness of the VTOL system is at least competitive, and is frequently advantageous. ...A comparison of VTOL, STOL, and CTOL systems shows that the operational cost effectiveness of the VTOL system is at least competitive, and is frequently advantageous. When the costs of ground facilities, ground access time, and social penalties are added, VTOL is seen to have a significant advantage over CTOL and STOL systems. ...When the costs of ground facilities, ground access time, and social penalties are added, VTOL is seen to have a significant advantage over CTOL and STOL systems.

For example, Sikorsky is preparing a two-phase program beginning with the readily available 46-passenger S-65-40 helicopter, and followed by introduction of the 100-passenger S-200 compound aircraft in 1980. The VTOL market potential is discussed, as is projected acceptance of the VTOL short-haul system in the Northeast Corridor and the principal routes of western Europe. ...This paper traces the evolution of the VTOL short-haul concept from its origins in 1967 to the present. It shows how design proposals have become more responsive to the evolving system and economic requirements of the potential operating airlines.

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.