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Review of the XB-70 Flight ProgramAlthough the major NASA research effort is directed toward XB-70-2, which will not enter its flight program until the summer of 1965, a limited amount of information is available from the early flights of the XB-70-1 airplane. Initial take-off and landing performance data have generally substantiated predictions and indicate no unforeseen problems for this class of vehicle. Vertical velocities at impact are of the same order of magnitude as those being experienced by present-day subsonic jets. The XB-70 distances from brake release to lift-off graphically illustrate the advantage of the increased thrust-weight ratio of the supersonic cruise vehicle. The landing loads are well within the design limits up to the highest vertical velocities encountered to date, and recorded data show the response at the pilot station to be somewhat greater than that recorded at the center of gravity. Persistent shaking has been encountered in flight at subsonic speed. The cause of the excitation is not known at present but the oscillation does not appear to be conventional buffeting. The oscillation occurrence drops off appreciably at supersonic speeds and can be correlated with atmospheric turbulence. The stability and control characteristics at subsonic speeds appear satisfactory with stability augmentation on and off. A longitudinal trim discrepancy from predictions has been noted in the transonic region which appears to be decreasing with increasing supersonic speed. The supersonic handling qualities are considered adequate with stability augmentation off; however, sensitive lateral control has resulted in small pilot-induced oscillations.
Document ID
20000011988
Document Type
Conference Paper
Authors
Sisk, Thomas R. (NASA Flight Research Center Edwards, CA United States)
Irwin, Kirk S. (NASA Flight Research Center Edwards, CA United States)
McKay, James M. (NASA Flight Research Center Edwards, CA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1965
Publication Information
Publication: NASA Conference on Aircraft Operating Problems: A Compilation of the Papers Presented
Subject Category
Aircraft Design, Testing and Performance
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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