You can plan 200-400 per pitch. The 21 pitch will add 400-800RPMs to your WOT. If your other prop performed satisfactory, than stay with that diameter and pitch, however if you need more RPM than you may be ok with the 21p...Good luck.

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You can plan 200-400 per pitch. The 21 pitch will add 400-800RPMs to your WOT. If your other prop performed satisfactory, than stay with that diameter and pitch, however if you need more RPM than you may be ok with the 21p...Good luck.
