Abstract
The current concept of static stability is not adequate for supersonic flight since it does not account for the influence of forces and moments due to altitude perturbations, which have a significant effect on the longitudinal motion. A new concept is proposed that accounts for altitude influence in an adequate manner. This concept, which is closely related to constant energy consideration, is based on a dynamic stability analysis with particular reference to the exponential characteristic modes of the airplane. Furthermore, it is shown that the well-known relation between static stability and the variation of elevator angle with speed is not valid in supersonic flight. As a consequence, the flight test methods currently used for determining static stability also are not adequate for supersonic flight. A new flight test method is proposed that provides an indication of static stability using the variation of elevator angle with altitude (or dynamic pressure, respectively). The points addressed may be of particular significance in regard to existing flying qualities requirements and criteria.
Original language | English |
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Pages (from-to) | 874-880 |
Number of pages | 7 |
Journal | Journal of Aircraft |
Volume | 14 |
Issue number | 9 |
DOIs | |
State | Published - Sep 1977 |
Externally published | Yes |