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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).
Normal ejection fraction of the heart is in the range of 60% to 80%. It can also be classified as normal, mildly reduced, moderately reduced and severely reduced without giving a percentage. The ejection fraction is used as a measure of the severity of heart failure and helps guide treatment. Please note: Symptoms do not always match the severity of the ejection fraction.