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been there done that didn't make a difference see http://whalercentral.com/forum/viewth...d_id=22713
Must get a 70HP or more for the Montauk 150 or an older 2-stroke to be a sports boat.
Will pull an adult on a Big Mabel tube with 600 lbs in the boat, but she still doesn't jump up quick and must have the second adult sit up front.
I went back to my "std" Vengeance as that is the best all around prop for this engine and boat.
We are lucky that it only takes a minute to change the props with the Spitfire so I do keep it on hand for when I know we are going to play, but again it isn't a speed boat.