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Pilot safety
The purpose of an ejection seat is pilot survival, not pilot comfort. Many pilots have suffered career-ending injuries while using ejection seats, including crushed vertebrae. The pilot typically experiences an acceleration of about 12–14 g (117–137 m/s²). Western seats usually impose lighter loads on the pilots; 1960s-70s era ex-Soviet technology often goes up to 20–22 g (with SM-1 and KM-1 gunbarrel-type ejection seats).
Lt. (j.g.) William Belden, 23, of Racine, Wisconsin, ejects from an A-4E Skyhawk on the deck of the USS Shangri-La in the western Pacific circa 29 July 1970. Photo by Photographers Mate Keith Guthrie of Palatka, Florida. Pilot was recovered by helicopter, unharmed; Skyhawk later recovered from carrier catwalk.[6]
The U.S. government selected the Martin Baker seat for the UK's new Joint Strike Fighter. The F-22 Raptor uses a variant of the ACES II ejection seat. The capabilities of the K-36 were convincingly demonstrated at the Fairford Air Show on 24 July 1993 when the pilots of two MiG-29 fighters successfully ejected after a mid-air collision.[7]
The minimal ejection altitude for ACES II seat in inverted flight is about 140 feet (43 m) above ground level at 150 KIAS. While the Russian counterpart - K-36DM has the minimal ejection altitude from inverted flight of 660 feet (200 m) AGL. Also, to eject safely from MiG-29A on the ground (zero level) the speed must be at least 40 knots (74 km/h).
By June 2009, Martin-Baker ejection seats had saved 7283 lives.[8] They give survivors a unique tie and lapel pin. The total figure for all types of ejector seats is unknown, but must be considerably higher.
http://en.wikipedia.org/wiki/Ejection_seat
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