High Speed Flight

At standard sea level, how fast do sound waves travel?

• 661.7 knots

• 661.7 kms

• 661.7 ms

The ratio of the true airspeed of an aircraft to the speed of sound is called?

• Mach number

• Density ratio

• Pressure ratio

Flight below Mach 0.75 is considered to be?

• Subsonic flight

• Transonic flight

• Hypersonic flight

Speed at which the local flow over the top of the wing becomes sonic is known as?

• Critical Mach Number

• Transonic flight

• Compressibility

Flight speeds above Mach 5.00 are called?

• Supersonic

• Hypersonic

• Transonic

When a highspeed flow of air travels through a venturi, what happens?

• Pressure: Increase

  Velocity: Decrease

• Pressure: Decrease

  Velocity: Increase

• Pressure: Increase

  Velocity: Increase

If a body is outside of the Mach cone of a moving object, would the body be affected?

• Yes

• No

• A little bit

When there is the first indication of local sonic airflow and the effects of compressibility is felt, this is considered to be?

• Critical Mach Number

• Excessive turbulence

• Shock Wave

Delaying the effects until higher airspeeds caused by a critical mach number is done by?

• Thin aerofoil with point of maximum thickness is far back from leading edge.

• Thick aerofoil with point of maximum thickness as close to leading edge.

• Thick aerofoil with point of maximum thickness is far back from leading edge.

How much energy is lost in an expansion wave?

• None

• 50%

• 60-90%