Short Test 22.6

When considering the relationship between different types of airspeed

Indicated Airspeed is not a speed at all, it is a pressure

True Airspeed is the speed of the aircraft through the air

The formula for calculating dynamic pressure is?

1/2pV2

The angle between the aeroplane longitudinal axis and the chord line is?

Angle of incidence

The airflow relative to the path of motion of an aerofoil is defined as?

Relative airflow

Total (pitot) pressure is the sum of?

Dynamic pressure + Static pressure

The deflection of the pointer of the Airspeed Indicator is proportional to?

Dynamic pressure

A moving mass of air possesses kinetic energy. An object placed in the path of such a moving mass of air will be subject to?

Static pressure and dynamic pressure

Dynamic pressure can best be described as?

Dynamic pressure occurs when moving air is brought to rest on the surface of a body, i.e. when relative movement exists between the surface and the airflow

How is the thickness of an aerofoil section measured?

As the percentage of chord

With reference to aerofoil section terminology, which of the following statements are true?

The angle of incidence is the angle between the chord line and the horizontal datum of the aircraft

The angle between the chord line and the relative airflow is called the aerodynamic incidence or angle of attack

The thickness/chord ratio is the maximum thickness of the aerofoil as a percentage of the chord, the location of maximum thickness is measured as a percentage of the chord aft of the leading edge

The difference between IAS and TAS will?

Decrease with decreasing altitude

With respect to aerofoils, which statement correctly describes thickness/chord ratio?

Maximum thickness of an aerofoil compared to the chord. This is expressed as a percentage with 10-12% being good all round ratio used in general purpose aircraft

A static pressure vent must be positioned

On a part of the structure where the airflow is undisturbed, in a surface parallel to the airflow direction

Calibrated airspeed (CAS) is equal to the True Airspeed (TAS)?

In the standard atmosphere at sea level only

Angle of attack is the angle between?

Undistributed airflow and chord line

Free-stream static pressure can best be described as?

The pressure of the atmosphere at the altitude at which an aircraft is flying which is free of any external influence

True airspeed (TAS) is?

Equivalent airspeed is corrected for pressure altitude and temperature, it is the actual airspeed of the airplane through the air

Which of the following statement is correct?

The thickness/chord ratio is expressed as a percentage of the chord

It is easier for air to flow over a well-rounded leading edge radius than a sharp leading edge

Two dimensional airflow assumes a wing with the same aerofoil section along its entire span, with no spanwise pressure differential

Air flowing towards the lower pressure of the upper surface is called upwash

The distance between the upper and lower surface of a wing is defined as the?

Thickness

The air pressure that acts on anything immersed in it:

It is also known as static pressure

With regard to aerofoils, how is the mean camber line determined?

The mean camber line is a median line halfway between the upper and lower surface of the wing

Qualities of high lift aircraft aerofoil

Rounder edge

Thicker camber

High L/D ratio

A line from the centre of curvature of the leading edge to the trailing edge, equidistant at all points from the top and bottom wing surface is the?

Camber line or mean camber line

A line drawn from the leading edge to the trailing edge of an aerofoil section and equidistant at all points from the upper and lower contours is called the?

Mean camber line

With regard to aerofoils, where is maximum camber found?

Maximum camber is the point where maximum distance between the mean camber line and the chord line occurs

Dynamic pressure?

The total pressure at a point where a moving airflow is brought completely to rest

The angle between the chord line of an aerofoil and the relative airflow is defined as?

Angle of attack

The imaginary straight line joining the leading and trailing edges of an aerofoil is defined as?

Chord line

Indicated airspeed (IAS) is?

The airspeed indicator reading uncorrected for instrument, position, and other errors, it is what you read on your airspeed indicator

When considering the relationship between different types of Airspeed

Calibrated Airspeed is Indicated Airspeed corrected for position error

Equivalent Airspeed is Indicated Airspeed corrected for position error and compressibility

Position error, which causes false Indicated Airspeed readings, is due to variations in the pressures sensed at the pitot and static ports

The Airspeed Indicator is calibrated to read True Airspeed when the ambient density is that of the ICAO International Standard Atmosphere at sea level