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.
Colles' fracture fracture of the lower end of the radius, the distal fragment being displaced backward. comminuted fracture one in which the bone is splintered or crushed, with three or more fragments. See illustration. complete fracture one involving the entire cross section of the bone. compound fracture open fracture.