Question

Your friend is an airplane enthusiast who likes to build his own engines. He is building a new engine and has asked you to help him. He tells you the engine must provide 192 hp of output power to the airplane to operate it safely. The fuel has a heat of combustion of 4.03 ✕ 10⁷ J/L. He has an exhaust and cooling system in his scrap pile that he wants to use for the new engine. This system can transfer energy out of an engine at a rate of 187 kW. His experiments on the engine have shown that it takes in 0.280 mL of fuel for each revolution of the crankshaft.

(a)

Based on these data, he wants you to determine if his engine can meet his design criteria while operating below a maximum safe angular speed of the crankshaft of 2,800 rev/min.

Yes, the engine will operate below the maximum angular speed.

No, the engine will operate above the maximum angular speed.    

(b)

He also wants to know how fast the engine will use fuel when run at a constant output power of 192 hp. (Enter the rate in L/h.)

L/h

Answer 1