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Bottom line the type certificate for the prop as a very generic note saying ANY CHANGE can affect the prop operations. How the prop vibrates (or dampens vibrations) for a specific configuration and causes metal fatigue is the issue. Keep in mind they have lots of safety factors and margins on the prop and blades. Back in the day people took fixed pitch metal props, cut them down, re-pitched the heck out of them. They had lots of fixed pitch metal prop fatigue failures. So it was a thing. Sensenich sells safe metal fixed props for the RV fast kit plane market now.... You'd be crazy to mod a fixed metal prop like that today, especially with so many good composite and wood props which are virtually fatigue free (but are subject to environmental damage). My opinion is FI vs Carb is not a big driver, except if it makes more HP. We have very free flow intake and exhaust which adds power. Cross Over vs 4-into-1 Pipes, Magneto vs Electronic Ignition, Compression ratio Low vs. High, Non counterweight crank vs counter weighted crank, are all players in how the prop vibrates (due to power pulses and size of that pulse). If you can find something close you are good. The fatigue life on these props is pretty long. Just avoid the yellow band RPM's of the configuration that is close to yours and you will be safe. |
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