Thanks for the reply again, maybe I wasn't clear enough with my question. Once the speed of the engines have been set by the throttles, (black levers)...i.e say 2750RPM, and the throttle lever settings are not altered, how does adjusting the RPM control (blue levers) alter the engine speed. The only way I can see this happening is by altering the pitch of the propeller, therefore adding or removing load from that particular engine.
Cheers
Depolox