I have a 1966 20 hp Johnson on a heavy 1448 welded alum flat. It runs great and pushes boat plus 23 mph and I cruise at 18 mph (Me, 6 gal gas, tool box, troll motor and battery). Problem is that with a second person boat will not plane. I'm looking at used outboards 20 to 35 hp in my area. The 9x10 prop with a shear pin seems to have to develop speed. I have a 9.9 Johnson with a flow through prop and it seems more responsive just too small of a motor. My questions:
1. When OMC changed to flow through exhaust props was that around the time engines were rated at prop ?
2. Will a newer model 20 hp with a flow through prop perform better than my old 20 hp.
3. Difference in 20 to 30 hp? 3 to 5 mph maybe?
1. When OMC changed to flow through exhaust props was that around the time engines were rated at prop ?
2. Will a newer model 20 hp with a flow through prop perform better than my old 20 hp.
3. Difference in 20 to 30 hp? 3 to 5 mph maybe?