15.5. The airplane of Problem 15.1 has an initial cruise weight of 5100 lb and carries 960 lb of fuel usable in cruise. Engine specific fuel consumption is 0.46 Ib/bhp-h. What is the cruise range?

15.1. A twin-engine, four-place airplane is flying at a pressure altitude of 6500 ft at a speed of 180 mph. Outside air temperature is 58F. The gross weight is 4500 lb. The rectangular wing has an area of 179 ft? with a span of 31.9 ft. Wing thiskness ratio is 0.13 and the sweep angle is zero; 90% of the wing is exposed. The wing parasite drag is 43% of the total parasite drag. Assuming a propeller (or propulsive) efficiency of 0.82, determine the required cruising brake horsepower per engine.

Solve 15.5