Results 1 to 4 of 4
  1. #1
    Member
    Join Date
    Jul 2013
    Location
    Richland, WA
    Posts
    221

    Downsizing prop question.

    What is the rule of thumb for rpm increase when stepping down in pitch?

    Pulling kids on the tube last year with a 26 BravoXS and I am wanting to add a few hundred rpms to the speed I was pulling them at. If I drop to a 24 would that add approx 200 rpms?
    John Wolff
    2003 Allison XB21 2+2
    2003 Mercury 250xs

  2.  
  3. Member
    Join Date
    Feb 2007
    Location
    Waterloo Iowa
    Posts
    3,139
    #2
    200 rpm either way is what I always thought. 1 inch of pitch = 200 rpm

  4. Member
    Join Date
    Oct 2006
    Location
    Metropolis, IL
    Posts
    3,771
    #3
    26 to a 24 = 400 rpm
    2013 Allison XB-21 BasSport Pro
    2013 Mercury 3.2 Stroker by DBR

    2012 Bullet 21ss
    2014 Mercury 250 Sport XS

  5. Member
    Join Date
    Jul 2013
    Location
    Richland, WA
    Posts
    221
    #4
    Thanks guys.
    John Wolff
    2003 Allison XB21 2+2
    2003 Mercury 250xs