Accession Number : AD0715317

Title :   An In-Flight Investigation of Lateral-Directional Dynamics for the Landing Approach.

Descriptive Note : Final technical rept.,

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s) : Hall,G. Warren ; Boothe,Edward M.

Report Date : OCT 1970

Pagination or Media Count : 306

Abstract : Lateral-directional handling qualities and roll control power requirements for executive jet and military Class II Airplanes in the landing approach flight phase were investigated in the variable stability T-33 airplane. Particular emphasis was placed on the effects of crosswinds and turbulence. Simulated IFR ILS approaches and VFR offset and crosswind approaches were made. Specifically, two Dutch roll frequencies, three Dutch roll damping ratios, three roll-to-sideslip ratios and three roll mode time constants were investigated. It was found that lateral-directional dynamics do not establish a limiting crosswind value; however, they do determine the ease or difficulty with which a crosswind approach can be accomplished. Roll control power requirements were determined from actual control usage data obtained throughout the evaluation program. In addition, a number of configurations were reevaluated with limited roll control power to determine minimum acceptable levels. Available roll control power can establish a limiting crosswind component. A number of configurations were evaluated with a stick controller in place of the normally used wheel controller to determine if the type of controller affected the lateral-directional dynamics for acceptable handling qualities. No difference was found to exist. A detailed comparison with MIL-F-8785B(ASG) requirements is included and generally shows the present requirements to be too conservative in the landing approach flight phase. (Author)

Descriptors :   (*FLIGHT CONTROL SYSTEMS, POWER), (*ROLL, FLIGHT CONTROL SYSTEMS), (*APPROACH, ROLL), JET TRAINING PLANES, JET AIRCRAFT, AIRCRAFT LANDINGS, HANDLING, FLIGHT TESTING, WIND

Subject Categories : Training Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE