Difference between 2 blade and 3 blade props for fastech

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  • carcode123
    Junior Member
    • May 2010
    • 14

    #1

    Difference between 2 blade and 3 blade props for fastech

    Does anybody know what the difference between 2 and 3 blade props if they both were the same pitch, will the 3 blade cause more cavitation.
  • tiqueman
    Fast Electric Addict!
    • Jul 2009
    • 5669

    #2
    Originally posted by carcode123
    Does anybody know what the difference between 2 and 3 blade props if they both were the same pitch, will the 3 blade cause more cavitation.
    Not necessarily, but if they are the same diameter, the 3 blade will heat things up a bit more.
    Geico epoxy laminate hatch sale thread Black Jack epoxy laminate hatch sale thread
    HPR06 6S Twin HOTR Genesis (SOLD) Vantex 32" cat Geico racing
    WEST FL MODEL BOAT CLUB www.scottskiracing.com

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    • BHChieftain
      Fast Electric Addict
      • Nov 2009
      • 1969

      #3
      Hi,
      We first used an X440/3 on my son's fastech, but had some cavitation until it got up on plane, once on plane it ran great. But I like the X642 prop better for this boat-- no cavitation, runs fast, and motor/ESC are only just warm.

      -Chief

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      • carcode123
        Junior Member
        • May 2010
        • 14

        #4
        why would it cause more cavitation.
        the big racing boats like miss gieco use 5 or 6 blade props

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        • BHChieftain
          Fast Electric Addict
          • Nov 2009
          • 1969

          #5
          Originally posted by carcode123
          why would it cause more cavitation.
          the big racing boats like miss gieco use 5 or 6 blade props
          I'm not sure, but the difference between the 440/3 and the 642 is huge...
          The 440 would be running at higher RPMs than the 642, so we can't really tell the diff between the 2 and 3 blade prop config here... (I can just say the X642 runs better than the X440/3).

          What would be interesting to test is the difference between an X440/3 and an X440/2... unfortunately, I don't have a two bladed 440...

          Does anybody have those two props to run an experiment? If somebody wants to sell me a X440 2 blade prop, I'd run the experiment and report back (I need that prop for a different boat, anyway). Or loan it to me and I'd send it back...

          -Chief

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          • tiqueman
            Fast Electric Addict!
            • Jul 2009
            • 5669

            #6
            Ive got both a 2 and 3 blade 440. I will run them on my SV tomorow and report back.
            Geico epoxy laminate hatch sale thread Black Jack epoxy laminate hatch sale thread
            HPR06 6S Twin HOTR Genesis (SOLD) Vantex 32" cat Geico racing
            WEST FL MODEL BOAT CLUB www.scottskiracing.com

            Comment

            • BHChieftain
              Fast Electric Addict
              • Nov 2009
              • 1969

              #7
              Originally posted by tiqueman
              Ive got both a 2 and 3 blade 440. I will run them on my SV tomorow and report back.
              Awesome! Let us know!

              -Chief

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