Abstract
T author begins by discussing recent drag and cooling improvements of both air-cooled and liquid-cooled aircraft engines and mentions the latest cooling versions as being the baffled air-cooled engine enclosed in an N.A.C.A. cowl and the high-coolanttemperature liquid-cooled engine with encased or buried radiators. The latest Hispano engine, which is an H type, liquid-cooled model is described. I t drives two oppositely-rotating coaxial propellers, each of which is geared to half of the total number of cylinders as a complete operating unit which may be stopped at any time without impairing the operation of the other half of the unit.
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