Aerodynamics 2

In steady horizontal flight the Cl of an aeroplane is 0.35. A one-degree increase in the AoA increases the Cl by 0.079. A vertical gust of air instantly changes the AoA by two degrees. The new load factor is:

• 1.9

• 1.45

• 0.9

• 0.45

In a gust, which combination of speeds is applicable for the structural strength of an aeroplane in the clean configuration at MSL?

• 28 fps and Vd

• 66 fps at all speeds

• 66 fps and Vb

• 56 fps and Vc

The load factor that determines Va is the:

• gust load factor at 66 fps

• manoeuvring flap limit load factor

• manoeuvring limit load factor

• manoeuvring ultimate load factor

To maintain altitude and speed when an aeroplane is rolled into a turn the pilot must (i) . . .. . .. . .. . .the thrust: (ii) . . .. . .. . .. . .. . .the angle of attack.

• (i) maintain;

  (ii) increase

• (i) increase;

  (ii) increase

• (i) increase;

  (ii) maintain

• (i) increase;

  (ii) decrease

The data that may be obtained from a buffetonset boundary chart is:

• Mmo for various masses and altitudes

• Mcrit for various masses and altitudes

• the low-speed and the high-speed stall Mach numbers for various masses and altitudes

• the low-speed and the high-speed buffet Mach numbers for various masses and altitudes

The manoeuvring load factor positive limit for a utility category light aeroplane in the clean configuration is:

• 6.0

• 4.4

• 2.5

• 3.8

Two aeroplanes at different masses execute a 20◦ banked turn at 150 kt IAS. The heavier aeroplane will:

• have a greater rate of turn than the lighter aeroplane

• turn at the same radius as the lighter aeroplane

• have a larger turn radius than the lighter aeroplane

• have a smaller radius of turn than the lighter aeroplane

The limiting load factor for a large transport aeroplane in the manoeuvring diagram is:

• 2.0

• 4.4

• 6.0

• 2.5

Two identical aeroplanes mass 1500 kg commence a 20◦ banked turn. Aeroplane A flies at 130 kt and aeroplane B flies at 200 kt. Which of the following statements is correct?

• The load factor for A is greater than the load factor for B.

• The turn radius for A is greater than the turn radius for B.

• The Cl for A is smaller than the Cl for B

• The rate of turn for A is greater than the rate of turn for B.

Given: TAS 300 kt; Bank angle 45◦; g = 10 m/s2. The turn radius is:

• 2387 m

• 4743 m

• 9000 m

• 3354 m