Title

Investigation of the Effects of Gusts on V/STOL Craft in Transition and Hover

Date

1968

Index Abstract

Not Available

Photo Quality

Not Needed

Report Number

AFFDL TR 68-85

Corporate Author

Honeywell, Inc.

Corporate Report Number

Honeywell ADG Report 12060-FR1

Laboratory

Air Force Flight Dynamics Laboratory

Extent

244

Identifier

AD0679593

AD0679593

Access Rights

This document has been approved for public release and sale; its distribution is unlimited

Distribution Classification

1

Contract

F33615-67-C-1563

DoD Project

None Given

DoD Task

None Given

DTIC Record Exists

Yes

Distribution Conflict

No

Abstract

The concern in the work reported is the development of statistical models for the gust environment in the earth's boundary layer for use in determining the gust response characteristics of V/STOL aircraft. A general gust model based upon published gust data was developed, and analyses of V/STOL responses with that model were conducted to determine the gust descriptors significant to V/STOL performance. An interim gust model embodying the significant descriptors was then developed for use in V/STOL gust analyses. Suggestions for meteorological experiments to measure the significant descriptors are made. The significant gust descriptors determined from the analyses are the diagonal terms of the gust covariance tensor, gust probability distributions, mean wind probability distributions, and the dependencies of these statistics on thermal stability, surface roughness, and altitude. Less critical descriptors include the off-diagonal components in the gust covariance tensor and the space-time interplay in that tensor. The significant gusts seen by the aircraft are head-on and vertical gusts on the wings; head-on and vertical gust shears across the wings; head-on, side, and vertical gusts on the tail; and head-on and side gusts on the fuselage. Mean airspeed and sideslip angle are important parameters in V/STOL gust responses. The wing-to-tail transport delay of the gusts in forward flight also has a significant effect. V/STOL gust responses at low airspeeds are generally small due to the low dynamic pressures, and the responses are decidedly nonlinear except at low gust amplitudes.

Report Availability

Full text available

Date Issued

1968-10

Provenance

Bombardier/Aero

Type

report

Subject

Vertical Takeoff Aircraft

Gusts

Flight

Response

Low Altitude

Statistical Analysis

Aircraft Landings

Gust Loads

Hovering

Probability

Mathematical Models

Takeoff

Format

1 online resource

Creator

Skelton, Grant B.