Performance

Question 1

What Three density air molecules contributes to ?

Answer 1

1. The production of lift and drag
2. The combustion of fuel to produce power
3. The generation of thrust by the spinning propeller

Question 2

What is Air density determined by?

Answer 2

The pressure of the air
- when air pressure is reduced , the air molecules move further apart (density drops).
- air pressure drops with increased height. ( higher you fly less dense air)

The temperature of the air
- Air temperature is increased , density drops

Question 3

How will performance be affected when its low air density compared to high air density?

Answer 3

Low air density ( hot and high) , performance reduced

High air density (low and cold), performance is enhanced.

Question 4

ISA

Answer 4

International Standard Atmosphere

• Sea-level pressure in ISA is 1013 hectopascals (hp) and the sea-level temperature is 15°C
• Pressure drops at 1hpa for every 30 ft of height increase
• Temperature drops at 2°C for each 1000ft of height increase

Question 5

Pressure Height

Answer 5

The height in the standard atmosphere where the pressure is equal to the air in your current environment

• Height above the 1013 pressure level.
  ( TO find the PH, use the knob to set 1013 on sub scale and the altimeter will read PH )