C-22 hull speed
Hi guys the Catalina 22 has a waterline length of 19' 4"with the formula : Maximum Hull Speed = 1.34 * LWL1/2that would give the theoretical maximum hull speed of 5.89 knots and not 7kts. Actually 5.89 kts is rather close to 7 MPH. Going any faster requires a seriously increased amount force. If you are using the Catalina recommend 4 to 6 hp outboard size "under usual conditions" your gas useage would be considerably less but I would consider an 8HP 2 cycle on the ocean if I were going out there. Your mileage may be depending upon other factors. If your outboard is running at a good cruising speed and not full throttle, the gas useage would be less. If your boat is heavily loaded, unevenly loaded or you are fighting strong headwinds or high seas your gas mileage would be more. If the hull is not smooth, if you are dragging something (Like a crab pot hooked to the keel), or if the prop isn't set up efficiently. One other thing, I have had situations where the prop thrust isn't in line with the rudder and that would put more drag on the boat. One thing that you can do to increase gas mileage is to "motor sail". Under certain situations, you can run the motor and have the sails up to get more wind past the sails for better efficiency. AS an example, this summer with our "new Style" C22 our top speed (according to our GPS) was 5.6 KTS with sails and with motor sailing was up to 6.1 KTS.