My mind is stuck in the fixed pitch world of RC aircraft. []

In simple RC engines, the throttle input (Tx stick) is proportional to the amount of fuel/air flow (carburator), which is proportinal to the engine and prop RPM.

My trouble is imagining this... at low throttle the fuel/air flow is also low (producing a small bang at combustion), but the engine is still at the constant RPM (presumably high RPM).

This is possible because the props would have been adjusted to a very low pitch and the load on the engine is very small.

Small bang + light load = high RPM
Big bang + high load = same RPM

Am I thinking right?

Thanks,
Juice