Boat porpoise problem

[Gerald]

Originally Posted by CajunChristian

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I use a 12" piece of 2X4 and a loaded rubber hammer. It takes much less blow than you think. I measure with a straight edge constantly to insure a smooth curvature. I usually just slide the boat back about 2' on the tail end of the trailer, lay on my back and tap away. About 10 minutes to completely hook both sides.
You want your boat to sit up on the tail and run, but, you don't want to use all available horsepower to lift the bow.

Less boat in the water=less drag. Less trim angle=less wasted horsepower.

The ways to control the bow on a loaded aluminum boat is:
weigh the bow down, not practical
trim the engine all the way down, a tremendous waste of horsepower
trim tabs, takes speed away, angle too sharp
hook the rear bottom of the hull, no speed loss

Thanks for the information, it may come in handy some day.

I also have a 16' Alumacraft with a 40 hp Tohatsu [restrictor taken out]. It will run 36 mph at 5750 rpm with the engine trimmed up about 1/3 of the way [on the trim gauge] before it starts to bounce. I probably have too much weight in the back [3 batteries, charger, and 9 gal. gas] to make it run any better.

I get about 35 mph and 5700 rpm with a little heavier load, so I am ok with the performance.