31-04. MASS AND BALANCE DETAILS OF AIRCRAFT
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1. From the data sheet for a medium range twin jet determine the moment effect of raising the flaps from 40° to 15″.
2. Where is the centre of gravity of the aeroplane in the diagram given:
Left main: 4.050 N
Right main: 4.080 N
Nose: 1.750 N
.
3. Give the distance of the CG from the datum for an aircraft where the CG is 23% MAC. The MAC is 90 inches and LEMAC is located 321 inches aft of the datum.
4. The loaded centre of gravity (CG) of an aeroplane is 713 mm aft of datum. The Mean Aerodynamic Chord lies between station 524 mm aft and 1.706 mm aft. The CG expressed as % MAC (Mean Aerodynamic Chord) is:
5. The mass and balance information gives: Basic Mass: 1.200 kg Basic Balance Arm: 3 m Under these conditions the Basic centre of gravity is at 25% of the Mean Aerodynamic Chord (MAC). The length of MAC is 2 m. In the mass and balance section of the flight manual the following information is given: Position Arm front seats: 2,5 m Position Arm rear seats: 3,5 m Position-Arm rear hold: 4,5 m Position Arm fuel tanks: 3,0 m The pilot and one passenger embark; each weighs 80 kg. Fuel tanks contain 140 litres of petrol with a density of 0,714. The rear seats are not occupied. Taxi fuel is negligible. The position of the centre of gravity at takeoff (as % MAC) is:
