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Which propeller for S2S or S2B?

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HAppyloop

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We have a Pitts S2S with the 2 blades Hartzell HC-C2YR-4CF. We would like to change for better gyroscopic characteristics, less harmful to the crankshaft. Which one do you advise? Performance wise, reliability? Thanks. Editing after Wes remark's : this is for a certified Pitts.
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