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Glossary of Terms
The nomenclature used in the following sections is presented in Tables A.1 and A.2.
A.3 Overall Aircraft
The initial calculation is of the helicopter drag which, together with the weight, will allow the thrust and forward tilt of the main rotor to be determined.
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Table A.1 Rotor
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Drag @100 velocity units |
D100 |
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Auxiliary power |
Paux |
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Transmission loss factor |
TRLF |
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Helicopter weight |
W |
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Helicopter drag |
D |
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Table A.2 Overall helicopter |
Drag can be specified in several ways; however, the method described here uses the drag force at a reference speed of 100 units (D100) at ISA sea-level air density as a basis. (This calculation can be readily adapted to any other specification of drag.) The drag of the helicopter is then calculated by factoring the D100 value with the square of the forward speed and linearly with respect to the air density, as follows:
s (A1)
