decrease speed of the engine

decrease in medical fitness

engine capacity / engine power, engine output

supersonic speed (exceeds speed of sound / Mach 1)

variable-speed with speed control

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

cruise speed / cruising speed

Nr gauge (Nr = speed of rotation) / rotor speed sensor

engine idling speed adjusting screw

engine speed range

high engine speed

full-speed trial of engine

engine speed adjustor

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine ground run / engine test

engine oil reservoir / engine oil tank

apparent speed

average speed

blade speed

convoy speed

critical speed

cross-country speed

endurance speed

exhaust speed

full speed (naut.)

gear speed decreaser

group transit speed

high-speed antiradiation missile (HARM)

high-speed boat

hypersonic (speed)

lightweight high-speed antisubmarine torpedo

maximum road speed