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  1. J

    Drilling vent holes in a prop

    Thanks for the tips guys. I started with an aluminum 3 blade, 17P. The boat definately wanted to over rev. I looked up the recommended prop and it said a 21P would be right for the RPM, so I ordered an aluminum 4 blade. It seems to be right for the rpm, but it of course hurt the hole shot...
  2. J

    Drilling vent holes in a prop

    Hi everyone. I apologize if this question has been covered before, but does anyone know of any guidelines to follow when drilling vent holes in a prop? I'm looking to get a little bit more acceleration when coming out of the hole (18' searay, 3.0L mercruiser, alpha 1 stern drive)...
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