Those numbers sound great! That prop is interesting, too. iirc that is PTProp's Rapture clone. Im sure my my 115 tower of power could never spin that prop or any other 14.25 x 21. If that has an excellent holeshot, I think your onto something here. How did your mph @ rpms work out, were you able to manage constant speeds at specific rpms? Where was your anti cav plate relative to keel on these runs?
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