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STUDY OF SIZE EFFECTS ON VTOL HANDLING QUALITIES CRITERIA

J. F. Johnston, I. H. Culver, Carl F. Friend

Open publisher page 1 citations

Abstract

A fundamental study is presented of the effects of vehicle size on handling qualities of jet and helicopter-type VTOL aircraft at hover and low speeds, size being defined by the characteristic linear dimension. The effects of size on vehicle handling qualities capability and pilot-vehicle compatibility are developed. Consideration is given to the pilot as an adaptive nonlinear servo. The study indicates: (1) Control power/inertia and damping/inertia tend to decrease with size. (2) Except for tail rotor helicopters in yaw, final angular rates are relatively invariant with size. (3) Characteristic time to reach final angular rate increases with size. (4) Linear accelerations and motions are nearly invariant with size. (5) Effects of external disturbances and trim changes with speed on jet VTOL vehicles decrease at least as rapidly as control power/ inertia.

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What this paper is about

A fundamental study is presented of the effects of vehicle size on handling qualities of jet and helicopter-type VTOL aircraft at hover and low speeds, size being defined by the characteristic linear dimension. The effects of size on vehicle handling qualities capability and pilot-vehicle compatibility are developed. Consideration is given to the pilot as an adaptive nonlinear servo. The study indicates: (1) Control power/inertia and damping/inertia tend to decrease with size. (2) Except for tail rotor helicopters in yaw, final angular rates are relatively invariant with size. (3) Characteristic time to reach final angular rate increases with size. (4) Linear accelerations and motions are nearly invariant with size. (5) Effects of external disturbances and trim changes with speed on jet VTOL vehicles decrease at least as rapidly as control power/ inertia.

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Available abstract

A fundamental study is presented of the effects of vehicle size on handling qualities of jet and helicopter-type VTOL aircraft at hover and low speeds, size being defined by the characteristic linear dimension. The effects of size on vehicle handling qualities capability and pilot-vehicle compatibility are developed. Consideration is given to the pilot as an adaptive nonlinear servo. The study indicates: (1) Control power/inertia and damping/inertia tend to decrease with size. (2) Except for tail rotor helicopters in yaw, final angular rates are relatively invariant with size. (3) Characteristic time to reach final angular rate increases with size. (4) Linear accelerations and motions are nearly invariant with size. (5) Effects of external disturbances and trim changes with speed on jet VTOL vehicles decrease at least as rapidly as control power/ inertia.

Key concepts: Computer science, Environmental science

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