Thanks, My engine is a fast strike which is probably the most difficult one to get to run slow. I can pull any thing from 13 to 40+. It is modified though. I love research projects. These motors are designed to run fast, but they can be tamed down. Most of the available props are also designed to run fast with bow lift which is counter productive for skiing. They also need to be modified. The 4 strokes have a lousy power weight ratio and would not be an option for me. I used the boat as a common interest starting very young. As a result I have a good relationship with all my kids and they are in their 30's and 40's now. It pays off. They were and still are most of my social life. jim
What about that 16 pitch prop you talk about. Is that too much blade area for the 150? I wish one of you guys would take a 17 in and have the cup hammered out of it. I think it would make a believer out of you. jim
I looked in my records for the prop work I had done. I started out with a stock 17 pitch OMC aluminum prop (new) about 10 years ago. It turned 2250 at 16. I took it to a prop shop and had the cup removed, and kept the same pitch. The rpms are as follows. 13 = 2400 16 = 2750 43 = 5500 47 = 6100 I tried and it will also hold 12 or any speed in between. At one time I thought this prop might have flattened out with time, however in 2004 I went through the same process with my daughters 17.6 and after the cup was removed (different prop shop) it turned more than 2750 at 16 so I had it re pitched to 18 to get the right rpm. The cup makes a lot more difference on the bottom end than I thought it would. I could now start with a similiar ss prop and get about the same results I think. Aluminum is cheaper to experement with. The prop has never been back to the shop so I think it is good enough for my use. jim
