WOT RPMs and HP

[zdmaster2k]

I've recently had a look at the trim (it's manual) on our two motors and, following the advice found here, the A-V plates are parallel with the water when we're planing. Because I've tilted the motors out we need more weight in the bow, that sound right?<br /><br />I've also heard here that if you're lugging the motor, it's gonna nacker it. It's not just set-up that'd cause this but also loading surely? Be honest, is 25hp on a 13ft dory not enough? As an indication, she won't plane out 4 up no matter how much we run around, but she's great one or two up.

 

[zdmaster2k]

Re: WOT RPMs and HP

Sorry, should have said before that the max HP for the hull is 40.

 

[CATransplant]

Re: WOT RPMs and HP

If the max HP for your boat is 40, then the 25hp motor is going to be marginal. That's especially true if the boat is heavily laden, as you say, with four souls on board.<br /><br />You say the boat is a dory. Is that the hull design, or just a term you're using? Dories are not the easiest boats to plane. You'd probably be happier with a 40hp or even a 35hp outboard. It'll plane with four aboard easily.

 

[G DANE]

Re: WOT RPMs and HP

The tri-hull Dory will plane fine, but the 25 HP really needs the right pitch. Connect a tach and see what your WOT Rpms are. I think it will need a 10" pitch.