Had about seven different boats and about just as many hull designed in my boating background. But this is my first offshore type. It's a 1996 Pro-line walk-around cutty model 201 (Stalker) with a 150 Merc OB, 14 X 19P SS prop. Probably near 4000 lbs loaded w/fuel, people, gear, etc.
Here is my question.. this boat runs 2.5-3 MPH (GPS) at idle speed 550 RPM, can run in displacement mode up to 7 MPH at 1200 RPM. And then it starts plowing the stern and digging in over 1200. If you give it throttle it planes up very quickly at 27 MPH and 4000 RPM even w/4 passengers and full tank (70 gallons), top speed is 42 MPH at 5300 RPM so the prop pitch looks about right for the HP. My problem is it sort of limits my running speed selection, I either have to run under 7 MPH or above 27, I normally cruise at 30 MPH holding close to 4000 RPM. If if falls 200 below 4K or 27 MPH the boat starts to loose plane. Its a fishing rig 90 % of the time, but I have used it to pull the grand-kids on tubes, however the boat rides like heck trying to hold it at 20 MPH (kids are young) the stern plows down and it takes constant throttle adjustment to hold the speed steady as it oscillates trying to get itself on plane. Is this normal for this type of hull deadrise is 19* ? Would some Bennitt (M120's) expand my operational choices.
Here is my question.. this boat runs 2.5-3 MPH (GPS) at idle speed 550 RPM, can run in displacement mode up to 7 MPH at 1200 RPM. And then it starts plowing the stern and digging in over 1200. If you give it throttle it planes up very quickly at 27 MPH and 4000 RPM even w/4 passengers and full tank (70 gallons), top speed is 42 MPH at 5300 RPM so the prop pitch looks about right for the HP. My problem is it sort of limits my running speed selection, I either have to run under 7 MPH or above 27, I normally cruise at 30 MPH holding close to 4000 RPM. If if falls 200 below 4K or 27 MPH the boat starts to loose plane. Its a fishing rig 90 % of the time, but I have used it to pull the grand-kids on tubes, however the boat rides like heck trying to hold it at 20 MPH (kids are young) the stern plows down and it takes constant throttle adjustment to hold the speed steady as it oscillates trying to get itself on plane. Is this normal for this type of hull deadrise is 19* ? Would some Bennitt (M120's) expand my operational choices.