prinicples of flight ( chapter 2 > required knowledge and skills )

Static pressure

Is the pressure extorted in all directions by a volume of air

Dynamic pressure

1. Is related to indicated airspeed ( IAS )

2. As IAS increases, so too does dynamic pressure

   definition ~ is the pressure caused when a fluid is moving ( kinetic energy )

Total pressure

1. Is the combined pressure of dynamic and static pressure.

2. The total pressure varies according to the amount of energy in a gas

When air pressure is high …

Density increases

What happens to air molecules when temperature is high

1. Molecules are more energetic

2. Tend to bounce off each other forcefully

3. Less mass ~ because there is more space between the molecules

indicated airspeed ( IAS )

The speed of the aircraft as shown on its pitot static airspeed indicator

Indicated airspeed ( IAS ) instrument error is

Instrument suffers from small errors caused by limitations of manufacturing process

Indicated airspeed ( IAS ) pressure error is

Position error ~ errors in measurement of both total and static pressure can occur because of the position of the pitot and static ports

Indicated airspeed ( IAS ) compressibility error is

At high speed the air entering the pitot tube becomes compressed which raises its density and induced errors occur

Calibrated airspeed

The indicated airspeed of an aircraft, corrected for position and instrument errors.

Equivalent airspeed

Is the calibrated airspeed of on aircraft corrected for compressible flow for a particular altitude

True airspeed

The airspeed of an aircraft relative to un disturbed air ~ e.g how fast your plane is really moving through the air around it

A pitot static system senses

1. Total air pressure and static pressure

2. It subtracts total pressure with static pressure to get dynamic pressure

What is the relationship between the volume and pressure of a fixed amount of gas at constant temperature

1. Volume of gas is inversely proportional to its pressure

2. This means as pressure increases, volume decreases