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Flight Evaluation of Various Short Period Dynamics at Four Drag Configurations for the Landing Approach Task

Report Number: FDL TDR 64-60
Author(s): Charles R. Chalk
Corporate Author: Cornell Aeronautical Laboratory
Laboratory: AF Flight Dynamics Laboratory
Date of Publication: 1964-10
Pages: 220
Contract: AF 33(657)-7442
Project: 8219
Task: 821905
AD Number: AD0608620

Abstract:
The T-33 variable stability and variable drag airplane was used in a flight program to evaluate various longitudinal short period characteristics at each of four drag configurations for the landing approach task. Pilot rating and comment data were collected and used to determine short period requirements for the landing approach task. The importance of the slope of the thrust required vs. velocity curve is discussed and related to pilot comments and control difficulties. The longitudinal control gain selected by the pilot was a function of short period frequency and damping ratio. Curves relating control authority and short period frequency and damping ratio are derived from these data. The power spectral density of the pilot's elevator stick motion was found to be significantly affected by short period dynamics and atmospheric turbulence.

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