Porpoising is the cyclic oscillation of a boat in pitch and heave of sustained or increasing amplitude occurring while planing on smooth water.

Aluminum bass boat porpoising. Crestliner boats are wildly popular in the freshwater world. I have been looking at Crestliner for a Tin for next year. Porpoising is cause by 2 thing 1 is the engine trim is to high.

Porpoising generally is caused by too much weight in the rear 90 degree flat transom on a flat bottom boat or the boat has a hook in the bottom near the back. Installed smart tabs and helped some. Can you move some weight further forward.

Changing the prop dont believe will fix your problem. Lets get started by discussing. The past 50 years of bass boat innovations have been like going from the invention of the wheel to rocket ships.

Propeller testing a 2010 90 HP Evinrude Etec on 2014 Triton X18 Aluminum Bass Boat. Putting transom wedges between the engine and the boat sometimes takes care of this or a wale tail with a down curved fin. If you have too much set back mid speed porpoising can be a problem and it you have it trimmed out too much at its going to porpoise 1.

Thankfully many of the issues faced by aluminum boats can be fixed with a little hard work and aftermarket products. This boat was run in the flats probably 100 times more that this G3 has ever been on the flats as we purchased this boat approximately 18 years ago and used it exclusively in the flats until the purchase of the G3 boat which we considered a real upgrade. Although most will rig the Triton X18Ranger RT188 with a 115 hp Etec some may choose a more economical 3 cylinder 90 hp Etec.

Just turned in my 2017 PT18. I have 19 pitch 3 blade prop. A 10 efficiency loss is generally considered good performance for a typical performance bass boat while 5-8 is considered good numbers for a race boat.