Definition of Safe-Separation Criteria for External Stores and Pilot Escape Capsules
Final rept. 20 Dec 1968-28 Feb 1970
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS
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It is shown that the early part of the trajectory of any store or escape capsule released from a parent aircraft is governed principally by two effects. The first is the relative velocity between the store and the aircraft at the instant of release. The second is the acceleration acting on the store at the same instant. This acceleration is due not only to gravity, but also to the aerodynamic forces and moments acting on the store. The normalized relative velocity and normalized acceleration, as the ordinate and abcissa, define a planar coordinate system. A boundary delineating safe from unsafe separation characteristics can be drawn on this plane. Thus, if the proper data are available, safe separation conditions can be predicted in advance. The available data from flight tests strongly support the predictive aspects of this diagram. In principle, since the diagram is based on velocity and airloads, no additional information is needed to define safe-separation characteristics. Moreover, the results from this study suggest that airload data for the store on a rack can be directly applied to give valuable results about safe-store separation.
- Military Aircraft Operations
- Escape, Rescue and Survival