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Overspeed is a condition in which an engine is allowed or forced to turn beyond its design limit. The consequences of running an engine too fast vary by engine type and model and depend upon several factors, chief amongst them the duration of the overspeed and by the speed attained. With some engines even a momentary overspeed can result in greatly reduced engine life or even catastrophic failure. The speed of an engine is ordinarily measured in revolutions per minute (RPM). ==Examples of overspeed== *In propeller aircraft an overspeed will occur if the propeller - ordinarily connected directly to the engine - is forced to turn too fast by high speed airflow while the aircraft is in a dive. *In jet aircraft an overspeed results when the axial compressor exceeds its maximum operating RPM - this often leads to the mechanical failure of turbine blades, flameout and complete destruction of the engine. *In vehicles an engine can be forced to turn too quickly by changing to an inappropriately low gear. *Most unregulated engines will overspeed should there be no or little load while power is applied. *In the event of runaway, a Diesel engine will overspeed if the condition is not quickly rectified. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Overspeed (engine)」の詳細全文を読む スポンサード リンク
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