Question

Consider an airplane patterned after the twin-engine Beechcraft Queen Air executive transport. The airplane weight is 38,220 N, wing area is 27.3 m², aspect ratio is 7.5, Oswald efficiency factor is 0.9, and zero-lift drag coefficient is CD,₀ = 0.03. Calculate the thrust required to fly at a velocity of 350 km/h at (a) standard sea level and (b) an altitude of 4.5 km.

Answer 1

To calculate the required thrust to fly at a velocity of 350 km/h, consider both standard sea level and an altitude of 4.5 km. In both scenarios, calculate the lift force, drag force, net force, and convert to thrust.

Step-by-step explanation:

To calculate the thrust required to fly at a velocity of 350 km/h, we need to consider two scenarios: (a) standard sea level and (b) an altitude of 4.5 km.

(a) Standard sea level:

1. Calculate the lift force using the wing area and the rule of thumb of 1000 N of lift per square meter of wing.
2. Calculate the drag force using the zero-lift drag coefficient, wing area, and the velocity.
3. Calculate the net force by subtracting the drag force from the lift force.
4. Convert the net force to thrust by dividing it by the Oswald efficiency factor.

(b) Altitude of 4.5 km:

1. Calculate the air density at the given altitude.
2. Repeat steps 1-4 from scenario (a) using the calculated air density.