#### piolenc

##### Member

The centrifugal force will be taken by the propeller mount bearings, and all bearings will be low-friction rolling element bearings. The remaining friction forces should be calculable from manufacturer's data. There is however another force which I know exists, but don't know how to calculate. This is the force that tends to force an unrestrained propeller to take the full flat pitch position. It is caused by the fact that, in that position, the propeller has the lowest potential energy with respect to centrifugal force (i.e. all mass elements are at their furthest outward point). Unfortunately, I haven't been able to figure out how to calculate the force driving the prop to that position, and I need to know it to know the actuation force for each blade and for the operating shaft. If it is too great, it is possible to partially compensate for it using counterweights, and those too need to be calculated.

If anybody knows of a book or a technical report that can help, I would be grateful to hear about it.