thumb|right|225px|An animation showing the four stages of the four-stroke gasoline-fueled internal combustion cycle with electrical ignition source: thumb|right|450px|Jet engines use the heat of combustion to generate a high-velocity exhaust as a form of reaction engine. Mechanical energy to power the aircraft's electrical and hydraulic systems can be taken from the turbine shaft, but thrust is produced by expelled exhaust gas.
thumb|right|225px|An animation showing the four stages of the four-stroke gasoline-fueled internal combustion cycle with electrical ignition source: thumb|right|450px|Jet engines use the heat of combustion to generate a high-velocity exhaust as a form of reaction engine. Mechanical energy to power the aircraft's electrical and hydraulic systems can be taken from the turbine shaft, but thrust is produced by expelled exhaust gas.