Formula boat porpoising

XCR-700 · 09-27-2019, 03:08 PM

Anyone here got experience with Formula boat porpoising???

Ours will do so with the smallest amount of trim on the outdrive.

I have never seen a boat tolerate such a low amount of trim (up) from full down.

If I use the trim tabs (maybe 3 - 5 dots on the indicator) it will bring the porpoising under control and allow greater trim up, but its a funny balance.

Wondering if its unique to the hull (Formula 270 BR) or maybe the stock props are not well suited to our loading and use.

BTW its a Mercruiser 8.2 Mag/Bravo 3 twin prop (stock)

Any thoughts are appreciated.

09-27-2019, 03:08 PM	#1
XCR-700 Senior Member Join Date: Sep 2008 Location: MA Posts: 1,333 Thanks: 744 Thanked 533 Times in 310 Posts	Formula boat porpoising Anyone here got experience with Formula boat porpoising??? Ours will do so with the smallest amount of trim on the outdrive. I have never seen a boat tolerate such a low amount of trim (up) from full down. If I use the trim tabs (maybe 3 - 5 dots on the indicator) it will bring the porpoising under control and allow greater trim up, but its a funny balance. Wondering if its unique to the hull (Formula 270 BR) or maybe the stock props are not well suited to our loading and use. BTW its a Mercruiser 8.2 Mag/Bravo 3 twin prop (stock) Any thoughts are appreciated.