Re: Porposing
Stickflipper;<br /><br />Moving the motor up will certainly help, but you should understand why this will help since the porpoising may not go away totaly. The motor shaft with the prop on the end becomes a lever arm. The boat is rotating ( in all directions) on an AXIS. If the motor shaft / prop is too long, the thrust will push at the bottom of the AXIS and rotate the bow up. Gravity will drop the boa back down, not the water and the prop will push it back up, and so the cycle goes (porpoising). <br /><br />When the motor is raised the thrust (and lever arm) is pushing closer to the center of the AXIS. <br /><br />Outboard powered boats are more suseptable to porpoising because the AXIS is closer to the stern. The bow area also has an easier time coming up simply because it has become a long lever arm also. ( you can pick up your boat / trailer from the tung, but not the transom. <br /><br />What you want is better balance. Raise the motor first. Run the boat second. If you are going to add soomething to rid yourself of the remaining porpoising, keep in mind that and fix rigid device (hooks in the bottom of the hull, or hydrofoils) will continuously change the balance as the speed changes. They may help at one speed or condition, and hinder at another.<br /><br />The best bet is to control the constantly changing conditions (speed, load, water) with something that also changes. Trim Tabs or Smart Tabs which are an automatic / active system.
