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On 9/20/2015 11:56 AM, GEORGE PUTNAM wrote:
Ernest made it impossible for me to pass up his nearly completed Dyke Delta. So basically I am just starting in the rotary world. For now I am figuring out Megasquirt and Asking the group to opine on a prop. Looking forward to responses. The Dyke made a 4500 mile road trip to get to my hanger.
George
Hi George; welcome to the group.
If memory serves, Ernest's redrive wasn't one of Tracy's. Do you know the ratio? You'll need to tell the prop carver the expected cruise & top speeds (honest, non-optimistic numbers), the actual HP of the engine (again, honest #), max expected rpm *of the prop* at top speed (wide open, low altitude), and the maximum diameter prop that the plane can physically handle safely with adequate ground clearance. (With a fixed pitch prop, you want the largest diameter you can safely swing without the tips approaching Mach, to improve takeoff/climb performance). The prop pitch number should be whatever the prop carver says it should be, because different prop makers use different methods to measure pitch.
Charlie
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