Fundamental limitations on V/STOL terminal guidance due to aircraft characteristics /
Julian Wolkovitch, Charles W. LaMont, and D. William Lochtie.

Description

Main Author

Wolkovitch, Julian.

Related Names

Lochtie, D. William.
LaMont, Charles W.
Lewis Research Center.
Mechanics Research, inc.

Language(s)

English

Published

Washington, D.C. : National Aeronautics and Space Administration ; 1971.

Subjects

Transfer functions.
Optimal control.
Flight paths.
Flight characteristics.
Control theory.
V/STOL aircraft.
Lift drag ratio.
Descent trajectories.
Approach.

Summary

A review is given of limitations on approach flight paths of V/STOL aircraft, including limits on descent angle due to maximum drag/lift ratio. A method of calculating maximum drag/lift ratio of tilt-wing and deflected slipstream aircraft is presented. Derivatives and transfer functions for the CL-84 tilt-wing and X-22A tilt-duct aircraft are presented. For the unaugmented CL-84 in steep descents the transfer function relating descent angle to thrust contains a right-half plane zero. Using optimal control theory, it is shown that this zero causes a serious degradation in the accuracy with which steep flight paths can be followed in the presence of gusts.

Note

"NASA CR-1901."
"December 1971."
Cover title.

Physical Description

xvi, 167 p. : ill. ; 27 cm.

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