Helicopters and Propeller-Type VTOL Aircraft in the Light of Technologies

Stępniewski, W. Z.; Young, M. I.

doi:10.4271/650193

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Compound Helicopters1

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1966

1969

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“…An indication of these limits is given in Fig. 31 (23) . It is seen that the various resonances, instabilities, and divergences experienced in rotary wing systems provide only a narrow corridor of possible operation.…”

Section: Compound Helicoptersmentioning

confidence: 99%

Future Rotorcraft Research in the USA

Yaggy¹

1969

Aeronaut. j.

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Projections of future trends in any field must be somewhat subjective; this assessment of future research on rotorcraft is no exception. However, an effort has been made at objectivity by presenting results of past and current research efforts as a foundation from which the projections are made. These projected trends are solely the opinion of the author and do not represent the policy of any agency within Government or industry, nor are they committal in any sense. Although some illustrations are derived from specific systems under investigation, the general intent of the paper is to avoid discussion of systems and to present illustrations representative of basic problems in the field of rotorcraft for which research effort can be expected to yield significant advance in performance and design.

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Section: Compound Helicoptersmentioning

confidence: 99%