Analysis of a Coupled Roll-Spiral-Mode, Pilot-Induced Oscillation Experienced With the M2-F2 Lifting Body. Technical Report NASA Technical Note TN D-6496, Research Engineering, NASA Dryden Flight Research Center

Kempel, Robert W. (1971) Analysis of a Coupled Roll-Spiral-Mode, Pilot-Induced Oscillation Experienced With the M2-F2 Lifting Body. Technical Report NASA Technical Note TN D-6496, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

During the 16 glide flights of the M2-F2 lifting body vehicle, severe lateral pilot-induced oscillations occurred on three occasions in the low-angle-of-attack, final-approach, preflare situation. These oscillations were analyzed qualitatively to determine the type and similarity and by a systems analysis to determine the root cause. The analysis was complemented by a piloted simulator study, which verified the results. The systems analysis revealed the presence of a coupled roll-spiral mode which caused the pilots to generate a closed-loop lateral instability in the low-angle-of-attack, preflare flight region. A systems analysis, a piloted simulator study, and flight data showed that the addition of a fixed center fin lessened the pilot-induced-oscillation tendencies in the critical flight region.

EPrint Type:	Other
Keywords:	Coupled roll spiral, Lifting body vehicles, Pilot-induced oscillations
Subjects:	Aircraft/Project: M2-F2 Aircraft/Project: M2-F3 (01 - 09) Aeronautics: (08) Aircraft Stability And Control
ID Code:	812
Deposited On:	14 March 2006
Additional Information:	59 pages.