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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, or EF, is a measurement that indicates how well your heart is functioning. This number tracks how much blood your heart is pumping out with each contraction. Your ejection fraction is described as a percentage. If youâre healthy, your ejection fraction is generally between 55% and 70%. For instance, an ejection fraction of 60% means your heart is pumping 60% of your blood out of your left ventricle (its main pumping chamber) every time your heart beats.