Airplane
What is the average power delivered by the engines to the airplane during takeoff?
46. The takeoff speed of a DC-3 airplane is 100 km/h. Starting from rest, the airplane takes 10 s to reach this speed. The mass of the (loaded) airplane is 11,000 kg. What is the average power delivered by the engines to the airplane during takeoff?
KE needed = ½ • m • V²
V = (100 Km/hr) • (1000 ⁄ 3600) = 27.78 m/sec → S.I. system.
KE needed = ½ • (11000) • V²
KE needed = ½ • (11000) • (27.78)²
KE needed = 4.24 ×10^6 Joules
Power = Energy ⁄ Time
Power = (4.24 ×10^6 J) ⁄ (10 sec)
Power = 4.24 ×10^5 watts
Power = 424 KW
BoB - Airplanes (Feat. Hayley Williams of Paramore)
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