Ace Aviation Redrive: New model

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Well-Known Member
Oct 7, 2010
Northern California, USA
...It looks like a four-bladed prop might be worth it at VP speeds.
Don't go there. The one thing most prop design discussions in this horsepower range neglect is Reynolds' number; by the time you carve four itty-bitty blades, all the assumptions about the airfoil that were built into the prop design software or input from TOWS are not valid anymore and your resulting performance disappoints. Two blades is the maximum number of blades you should consider for an airplane in this speed/horsepower range unless you're "doing the math" to account for the reduced Reynolds' number.