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supercruise
Supercruise is sustained supersonic flight of a supersonic aircraft with a useful cargo, passenger, or weapons load performed efficiently which typically precludes the use of highly inefficient afterburners (reheat). Many well known supersonic military aircraft are not capable of supercruise as they are only able to maintain supersonic flight in short bursts (typically with afterburners) while they cruise at subsonic speeds. Aircraft such as the SR-71 Blackbird are designed to cruise at supersonic speed with afterburners enabled.
One of the most prominent and well-known examples of this type of aircraft was Concorde. Due to its long service in commercial airlines, Concorde has the record for the most time spent in supercruise; it has spent more time in supercruise than all other aircraft combined.〔(【引用サイトリンク】title=Defence & Security Intelligence & Analysis - IHS Jane's 360 )〕
== Advantages ==
Most military aircraft use afterburners (or reheat) to travel at supersonic speeds and cannot reach supersonic speeds using the dry engine thrust. Afterburners are highly inefficient compared to conventional jet engine operation due to the low pressures typically found in the exhaust section. This limits most aircraft to using afterburners for only very short periods. Therefore, an aircraft that can supercruise has generally greater endurance at supersonic speeds than one which cannot. Supercruise capability is also an advantage for stealth aircraft, as an afterburner plume both reflects radar signals and creates a significant infrared signature〔(【引用サイトリンク】title=Stealth design of airplanes / stealth aircraft )〕 in addition to being visually conspicuous.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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