I am looking at using an Aeromatic wood prop. I know a guy that makes these propellers and he has a lot of the original hubs to build props from. He tells me that the 8 bolt pattern is not used much (I think they were used on the Franklin engines) and he will let me come in and build my own prop with one of these 8-bolt hubs. Will the Ross copy PSRU's be built so that flange could be drilled to accommodate the hub?

BTW. this guy has been experimenting with the original Aeromatic design and he claims to have made some improvements that I think are fairly significant. He claims that IF, IF the prop is adjusted correctly and IF the engine is turbo normalized, he can make the prop work exactly like a CS with the exception of no cockpit controller. For non turbo normalized engines he has an altitude compensating adjuster device that will automatically correct the propeller adjustment to compensate for power loss at altitude. The altitude compensating device has not yet been flight tested though. If all this is true it might be worth looking at. No hollow crankshaft, no prop governor, no electric controlling system. I don't know the weight but he claims it is about half the weight of a CS. he sells them installed for $5350. Not sure how this measures up to the electric composite propellers.

Paul Shamlian


Yes I can do that as in the Ross design the prop flange is a separate part.

Paul Lamar