Onan,
All generalisations are dangerous, but the average SEP tourer CS prop is set up so that in the event of the failure of the oil pressure to the hub, the centrifugal forces will push the prop to fine pitch. In prop shorthand, this is an "oil to increase pitch" prop. On the average twin, it's set up the other way, "oil to decrease pitch", so that oil pressure failure takes the prop to coarse pitch and it can be feathered. Some of the more advanced aerobatic types take into account the possibility of oil pressure fluctuations due to extreme manouevring at high indicated air speed and redline RPM - and therefore go for and "oil to decrease" prop to reduce the risk of the engine blowing up through over-revving at the moment of the oil pressure faltering.