Permatrim Hydrofoil for Outbord Engines and Stern Drives
Permatrim was designed and developed by Maurice Ellis of Whangarei in 1986. It came about because he found a need to improve his boats performance, better – planing speeds and handling. After experimenting with different materials and techniques the permatrim was born.
Boats that suffer from cavitation issues will benefit greatly from using a permatrim. By increasing the size of the factory cavitation plate, by up to four times, and the additional benefit of the turned down sides, Permatrim reduces the chance for the propeller to draw in air that will create an air pocket around the Propeller - one of the causes of cavitation/ventilation. By having a larger cavitation plate & the turned down sides, the Permatrim condenses/compresses the water around the Propeller helping eliminate the chance of air being drawn into the Propeller.
By increasing the size of the Factory cavitation plate by up-to four times, the Permatrim will provide a lot more stern lift, so you can stay on the Plane at a lower speed. In rough conditions it is far safer to be able to stay on the plane at a slower speed. Permatrim will help you do this by increasing the stern lift & trim control of your outboard/sterndrive.
By increasing the size of the cavitation plate by up-to four times, the Permatrim increases the stern lift and trim control, to plane faster. The Permatrim extends out past the end of the cavitation plate, to catch the wasted water from the top of the Propeller (the hump of water out the back), holding this water down and forcing it rearward, this increases the stern lift and thrust from your outboard/sterndrive from the same amount of rpm. By having more stern lift and trim control, this allows you to holds the bow down and stern higher, so the boat will plane out flatter, which will help the boat rise up onto the plane easier, also providing better forward vision from not raising the bow so high.
A Permatrim enables a lot more control of trim angles and the ability to eliminate porpoising, and allows you to plane at a lower speed. Trim control is important as you need to be able to adjust your bow to suit the conditions and make your boating excursions safer and more comfortable. As the permatrim is up to four times larger than the factory cavitation plate, your trim control is greatly enhanced allowing you to trim the bow down hard in a rough head sea or will allow you to hold the bow higher in a following sea , giving you a lot more trim control, and a more comfortable ride. Because a Permatrim gives you more trim control and stern lift, eliminating Porpoising issues is a breeze, just a small adjustment down on the trim button is usually all it takes to stop the Porpoising. Always, remember to check the weather forecast before making a safe decision to go boating.