The aircraft, whose power is 3000 kW, with a thrust of 4.3 kN flew 360 km in 30 minutes.

The aircraft, whose power is 3000 kW, with a thrust of 4.3 kN flew 360 km in 30 minutes. Determine the efficiency of the aircraft engines.

To determine the efficiency of the engines of a given aircraft, we apply the formula: μ = Np / Nd = F * V / Nd = F * (S / t) / Nd = F * S / (Nd * t).
Values of variables: F – traction force (F = 4.3 kN = 4.3 * 10 ^ 3 N); S – distance traveled (S = 360 km = 360 * 10 ^ 3 m); Nd – engine power (Nd = 3000 kW = 3 * 10 ^ 6 W); t – elapsed time (t = 30 min = 1800 s).
Let’s make the calculation: μ = F * S / (Nd * t) = 4.3 * 10 ^ 3 * 360 * 10 ^ 3 / (3 * 10 ^ 6 * 1800) = 0.287 or 28.7%.
Answer: The efficiency of the motors is 28.7%.