Prior to the current CNC machined props (2000+??) props were cast, beat over a pitch block & a cupped edge was formed by hand, then polished. We had choices of no cup, cup, and heavy cup/double cup. I had a piece of railroad rail I carried to the towboat tests that I would use with by short handled 2# hammer to "field adjust" the cup on props. Lost that piece of rail in the move from Florida to Louisiana, those were the good old days. Ask your prop builder what they consider heavy cup, my guess is that .110 is a std. cup. Also the new CNC machined props tend to flex less and are more true to the pitch than the old days, my brother has more experience with these props as he is constantly trying to squeeze more from his Barefoot Skier. You may end up with a 13 x 11 x 1 in a CNC prop to match the old school. To get real advise you need to provide the typical use, and wide open throttle (max) RPMs the engine is turning now. I spent most of my career developing max torque and speed holding ability in the slalom/jump range with prop tuning.
