the collective controls the pitch of the rotor blades, yes, but since the air drag increases with the pitch the throttle of the engine also have to be increased to hold the rotor rpm in 'the green arc' (eg. for the bo105 is it at 450 RPM) . This is made by a mechanical device called correlator, in some piston driven helis an electronic govenor prevents additionally rpm drops (due to the significant lower rpm of a piston engine, the engine would full stop, not so nice...).
i am not sure what the collective has to do with the throttle. if i
understand this correctly, the collective changes the pitch of the
rotor blades. i thought helicopters don't have a throttle the way
fixed wing aircraft do: i.e. the engine is always at a constant rpm.
but then i am not a helicopter pilot so i might be wrong.
In Flight Simulators the collective is usually laid on the throttle due to the limitations of input devices (joysticks).
Regards
Ron
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