Prop Selection

[Bissetg]

Has anyone done static thrust strain gauge testing with their Bearhawk? I’m interested in what engine prop combos produce.

[jaredyates]

Bob has done quite a bit of this kind of testing. There is one example in the Beartracks.

https://bearhawk.tips/1833

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He has built his own propellers and checks each one. Static thrust isn't a comprehensive test but is a worthwhile datapoint.

It would be cool to have a chart with several airplanes and their results.

Something I learned at Oshkosh is that Michel Roy is running a fixed pitch prop on his 540 Bearhawk. He reaches 2700 RPM at Vne, and his static RPM is around 2100. That spread is indicative of what it takes to cover our speed range.

[Aero_tango]

Just to give more details on my prop/engine combo. O-540, 245 HP, Catto FP (84/58). Static RPM is 2170 RPM. At full power (1500 ft elevation), I reach 2750 RPM at VNE.
Michel Roy
C-FYMR