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A prop driven aircraft has propeller efficiency of 0.92 and C as 0.000745 1/m. If lift to drag ratio is 14 and weight fraction as 1.145 then, find range of the propeller driven aircraft.(a) 2340.95m(b) 2340.5miles(c) 2340km(d) 2500milesI have been asked this question by my college professor while I was bunking the class.The query is from Flight Mechanics topic in section Performance and Flight Mechanics of Aircraft Design

Answer»

Right answer is (a) 2340.95m

To ELABORATE: PROP RANGE = (lift to DRAG)*[PROPELLER efficiency/C]*ln (weight fraction)

= 14*[0.92/0.000745]*ln (1.145) = 2340.95m.



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