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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).
Ejection fraction is a common measurement of how strong your heart is. The normal heart fills up with about 100 milliliters of blood per beat, and pumps out about 60 milliliters per heart beat. That means that the normal ejection fraction is 60 / 100 = 60%.