Title

An Analytical Study of V/STOL Handling Qualities in Hover and Transition

Date

1965

Index Abstract

Coming Soon

Photo Quality

Not Needed

Report Number

AFFDL TR 65-73

Creator

Stapleford, R. L.

Wolkovitch, J.

Magdaleno, R. E.

Shortwell, C. P.

Johnson, W. A.

Corporate Author

Systems Technology, Inc.

Laboratory

Air Force Flight Dynamics Laboratory

Extent

172

Identifier

AD0625599

Access Rights

Notice(s)

Distribution Classification

1

Contract

AF 33(615)-1300

DoD Project

8219

DoD Task

821909

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Abstract

The hover analysis considers pilot attitude and position control tasks in the presence of horizontal gusts. The effects of each of the stability derivatives on the difficulty of the control tasks and on the closed-loop gust responses are determined. It is clearly shown that the handling qualities studies of control sensitivity and angular damping must consider the influences of M sub u (or L sub v) and should include gust inputs. These conclusions are substantiated by previous variable-stability-helicopter experiments. The effects of vehicle size and geometry are investigated by several approaches. The key result of increasing size is found to be a reduction in M sub u and L sub v which can, in turn, lower the requirements for control power and damping. The handling qualities during transition of two vehicles, a tilt duct and a tilt wing, which were previously tested on a simulator are analyzed. It is shown that both trim control and perturbations about the trim conditions must be considered. In fact, part of the increased difficulty in landing transitions, in comparison with takeoff transitions, is due to more difficult trim control; the much more stringent position control requirements in landing are also a contributing factor.

Report Availability

Full text available

Date Issued

1965-10

Provenance

AFRL/VACA

Type

report

Format

1 online resource