Calculate the maximum velocity of the Predator at sea level.

The Predator UAV (see Fig. 6.63) has the following characteristics: wingspan = 14.85 m, wing area = 11.45 m2, maximum weight = 1020 kg,, and fuel weight = 295 The power plant is a four-cylinder, four-stroke engine of 85 horsepower driving a two-blade, variable-pitch pusher propeller. Assume that the Oswald efficiency factor is 0.7, the zero-lift drag coefficient is 0.03, the propeller efficiency is 0.9, and the specific fuel consumption is 0.2 kg, of fuel per horsepower per hour. Calculate the maximum velocity of the Predator at sea level.


 

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