Maybe it won't matter so much in Africa, but if you fly a CS prop 'over here' you can make a great contribution to lower noise levels on the ground by doing the circuits at a reasonably low RPM. I usually run at about 2100-2000 RPM a couple NM before the airfield and stay on that setting until short final crossing the fence.
I live at 2NM final from my airport and some pilots seem to need 2700RPM just to get around the circuit.