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A power plant for aircraft includes an engine‐cooling system, an oil‐cooling system, a super‐charging system, and means for preheating the air supply to the engine, some of which parts are formed integrally with, and others being attached to, the engine crank‐case which alone is adapted for attachment to the aircraft. As shown, a header tank n for the engine cooling system is connected by a pipe o to a radiator r disposed in a tunnel or recess of the engine cowling. The radiator r is connected to a pump u which delivers water to a water‐jacket w from whence it passes by pipes x to the tank n. Air passing through an oil cooler 11 is led to the carburetter air‐intake 13. Only a part of the air flowing through the radiator r may pass through the cooler 11. An oil suction pump 15 draws oil from the cooler.