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.
/ËkÉËmËpaund/. noun. plural compounds. Learner's definition of COMPOUND. [count]. 1. : something that is formed by combining two or more parts. especially technical: a substance created when the atoms of two or more chemical elements join together.chemical/organic compounds. a compound of sodium and chlorine.earner's definition of COMPOUND. 1. : made up of two or more parts. a compound leaf. a compound microscope. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 2. a: made by combining two or more words. âSteamboatâ is a compound noun.