FLIGHT MANUAL
DYNALI HELICOPTER COMPANY
Edition N°3
DYNALI H2S January 2012
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17
International Standard Atmosphere
Atmosphere model for which the sea-level pressure is equal to 1013.25 hPa, the
sea level temperature is at 15°C and the temperature gradient is at -6,5°C per
1000m (3000ft) of altitude. The air is considered as an ideal gas.
1.5.
ABREVIATIONS AND DEFINITIONS – WEIGHT AND BALANCE
Datum :
Reference point for balancing
As regards calculations, the Dynali design office has chosen the axis of the main rotor
as the datum.
Station
: Distance from the datum point to the centre of gravity of a component.
C.G. : Centre of gravity (
Point from which the helicopter would balance, if suspended).
Balancing
:
Horizontal distance from the CG of the component concerned in relation to the datum point.
Balancing limits
Distance limits from the CG for which use of the helicopter may be operated at a given
mass.
Standard empty weight
Weight of helicopter in standard configuration, with unusable fuel reserve, full operating
fluids and full engine oil.
Basic empty weight
Standard empty weight to which is added the weight of all optional equipment.
Payload
Difference between maximum takeoff weight and basic empty weight.
Unusable fuel
Fuel which can not be used in flight.
