Question

There is an airplane which weighs 180 kN with an area of 160 meters squared

Find:

a) Calculate the lift coefficient if the plane is going at 112 m/s at a standard altitude of 3000 meters

b) Find the drag force and the lift-to-drag ratio at cruise if the drag coefficient is 0.02

c) The plane is crafted to land at a velocity V₀ = 1.2 V_stall with the flaps at -10 degrees. Using the density at sea level, find the landing angle of attack and the landing speed

Answer 1

weight 100KN massy 100000 9.8 18367.34 34 kg. a) lift is a force ~ f = ma Lef= m(vivo) LEF= 1836734 X V V= 112 m/s L= 18367.34 X (12 m/s. L= 20.57x105 kgm/s² Lift eqn La CIXAXO SX SX 62 CI= L AXO 5XXUR P= 2.38x102 CI= 20.57XIOS 160X0:5*2.36x102x (112) CI: 0.0 b) drog force G D = AX Cd X OSX 8 X v² D: 160 * 0.020 SA 230 x 10°3x(12) 477.67 lift to drag ratio, f Los 7x105 . 43063 D 477167