Studies of Limb-Dislodging Forces Acting on an Ejection Seat Occupant.
Abstract
In this report, the forces tending to dislodge the limbs of an ejection seat occupant from one another, or from a restraining surface, are calculated in the absence of flow separation. For a simulated ejection taking place at an altitude of 10,000 feet, the results show that, based on published data for a pilot's average grip retention capability, the probability of his letting go is 100% if the ejection occurs at Mach numbers exceeding 0.72. Moreover, the probability of major flail injury is around 100% if the ejection Mach number exceeds around 1.25. One major factor which contributes to these large limb-dislodging forces is the generation of stagnation points in the flow. In order to examine further the role played by flow separation around the blunt body segments, a complex velocity potential is developed to describe a stationary vortex pair located in the wake region of the flow. It remains to super-impose this vortex pair on the unseparated cross flow in order to ascertain the drag forces which contribute to limb-dislodgement. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1979
- Accession Number
- ADA064882
Entities
People
- Daniel J. Schneck
Organizations
- Virginia Tech