An airplane in straight and level flight at sea level (air density ρ = 1.225 kgm −3 ) has mass m = 4500 kg, wing projected area S = 20 m 2 and Oswald factor e = 0.90. The lift curve is C L = 0.2 + 0.2α (angle of attack in degrees), with stall angle of attack α S = 10 o . In this situation, α = 0.633 o . The required power is given by P r = 0.12 v 3 + 2 10 7 / v ( v in ms −1 ). Taking g = 10 ms −2 , what are the approximate speed and flight regime?

Question

An airplane in straight and level flight at sea level (air density ρ =  1.225 kgm −3 ) has mass  m  = 4500 kg, wing projected area  S  = 20 m 2  and Oswald factor  e  = 0.90. The lift curve is  C L  = 0.2 + 0.2α (angle of attack in degrees), with stall angle of attack α S  = 10 o .  In this situation, α =  0.633 o . The required power is given by  P r  = 0.12  v 3  + 2 10 7 / v  ( v  in ms −1 ). Taking  g  = 10 ms −2 , what are the approximate speed and flight regime?

Answer

v   ≅ 75.0 ms −1 , 1st regime.

Answer

v   ≅ 106.1 ms −1 , 2nd regime.

Answer

v   ≅ 75.0 ms −1 , 2nd regime.

Answer

v   ≅ 106.1 ms −1 , 1st regime.

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An airplane in straight and level flight at sea level (air density ρ = 1.225 kg...

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