Recent content by Irrational

  1. I

    4 bladed prop

    I am new to this so let me try I have a 390 EC gas with 4 blade nibrol props (20x18x4bl ni cup) I hit 4300 rpm with 1/2 tank of gas about 31 MPH. I have herth trans(might not be the proper spelling) Irrational
  2. I

    4 bladed prop

    I have a 1989 390 EC with 20x18x4bl ni cup props Irrational
  3. I

    4 bladed prop

    I have a 1989 390 EC gas with 4 blade Nibrol props. I am sitting on my boat now when I get home I will let you know the size and pitch. IRRATIONAL
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