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Flight Investigation of the Stability and Control Characteristics of a 1/4-Scale Model of a Tilt-Wing Vertical-Take-Off-and-Landing AircraftAn experimental investigation has been conducted to determine the dynamic stability and control characteristics of a tilt-wing vertical-take-off-and-landing aircraft with the use of a remotely controlled 1/4-scale free-flight model. The model had two propellers with hinged (flapping) blades mounted on the wing which could be tilted up to an incidence angle of nearly 90 deg for vertical take-off and landing. The investigation consisted of hovering flights in still air, vertical take-offs and landings, and slow constant-altitude transitions from hovering to forward flight. The stability and control characteristics of the model were generally satisfactory except for the following characteristics. In hovering flight, the model had an unstable pitching oscillation of relatively long period which the pilots were able to control without artificial stabilization but which could not be considered entirely satisfactory. At very low speeds and angles of wing incidence on the order of 70 deg, the model experienced large nose-up pitching moments which severely limited the allowable center-of-gravity range.
Document ID
19980228235
Acquisition Source
Headquarters
Document Type
Other - NASA Memorandum (MEMO)
Authors
Tosti, Louis P. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1959
Subject Category
Aircraft Stability And Control
Report/Patent Number
NASA-MEMO-11-4-58L
L-120
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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