I have a Seaswirl bowrider 230 with a 5.7 280 hp Volvo penta sx drive.
The drive gears are 1.43. The boat weighs 3800 dry. With a light load, and 40 gallons of gas the boat comes on plane easily. WOT speed is about 46mph at about 4500 rpms. This is with a 19" volvo aluminum prop. The manual...
