Efficiency of a propeller is defined as the ratio of available power to the engine power which is. . (3). Note, that this definition for efficiency contains the velocity v, which means, that the efficiency approaches zero as the flight speed goes to zero, because the thrust cannot become infinitely large. So this definition is not useful for the special case of static thrust.
1 Compound Fracture: A compound fracture is a fracture in which the injured bone sticks through the skin. 2  Also known as an open fracture, a compound fracture can be a bit more serious in nature.
â¢ COMPOUND (noun). The noun COMPOUND has 3 senses: 1. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight. 2. a whole formed by a union of two or more elements or parts. 3. an enclosure of residences and other building (especially in the Orient).. consisting of two or more substances or ingredients or elements or parts. 3. composed of many distinct individuals united to form a whole or colony. Familiarity information: COMPOUND used as an adjective is uncommon.