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In the early 1960s, deployment of rocket-powered ejection seats designed for use at supersonic speeds began in such planes as the Convair F-106 Delta Dart. Six pilots have ejected at speeds exceeding 700 knots (1,300 km/h; 810 mph).
A normal ejection fraction is 55 percent, according to Mayo Clinic. An ejection fraction of 50 percent or below is considered reduced and usually indicates some degree of damage to the heart. Doctors differ in their interpretations of ejection fractions in the 50 to 55 percent range. Continue Reading.