Trim, and speed... ideal adjustments?

[Zim]

I realize the boat will get on plane faster with the trim all the way down, but do you try to trim it all the way up when you want to go faster? Whats the ideal way to set your trim if you're water skiing or tubing opposed to that of just cruisin around. Does it affect gas much? Just curious on this since this is my first boat with power trim.

 

[Gary H NC]

Re: Trim, and speed... ideal adjustments?

Its different for every boat. Water conditions,how much weight on board ect.
Start out trimmed down,after it gets on plane start trimming up.You will feel the speed and rpms increase.Trim up just until the boat starts to porpoise(or bounce) or until the prop starts to blow out(lose bite) Then trim down just a bit and you are at the most efficient setting..

 

[QC]

Re: Trim, and speed... ideal adjustments?

I would add that if she won't porpoise you should move some weight aft until you can just get her to start porpoising at the highest trim levels. I usually only use slight up trim when pulling skiers etc., and you'll want to trim down for hard turns and quick maneuvers.

 

[dingbat]

Re: Trim, and speed... ideal adjustments?

I would add that if she won't porpoise you should move some weight aft until you can just get her to start porpoising at the highest trim levels.

I have nothing in the bow at all and I can't get the boat to even come close to porpoising. All that happens when I trim up tp far is my prop blows out.

What should I do?

 

[ruf1967]

Re: Trim, and speed... ideal adjustments?

when the prop starts to blow out, trim down until it bites again. Then you're good.

 

[QC]

Re: Trim, and speed... ideal adjustments?

What should I do?

Other than possible X dimension (I/O) or motor height (OB) stuff, this also sounds like a balance issue to me. Is there any weight; batteries, fuel, stuff, tools, anchors, chain, ice, water, literally anything that you can stow further aft? For example, if you have any life jackets stowed aft and anything heavier stowed even a little bit further forward, swap 'em.

BTW, usually the fastest way to run is to get to that slight porpoise point and then control the porpoise with trim tabs

Edit: although ruf1967 is correct, the topic is ideal trim/speed . . .

 

[dingbat]

Re: Trim, and speed... ideal adjustments?

Other than possible X dimension (I/O) or motor height (OB) stuff, this also sounds like a balance issue to me. Is there any weight; batteries, fuel, stuff, tools, anchors, chain, ice, water, literally anything that you can stow further aft? For example, if you have any life jackets stowed aft and anything heavier stowed even a little bit further forward, swap 'em.

BTW, usually the fastest way to run is to get to that slight porpoise point and then control the porpoise with trim tabs

Edit: although ruf1967 is correct, the topic is ideal trim/speed . . .

Hummm.. I wonder if it?s the 400# of fuel in the fore deck tank that will not allow me to porpoise

Seriously, it varies for every hull. At fighting weight (full load of fuel, Ice, tackle etc.) I leave the dock weighting right around 6K# with a 22' boat. If this boat is even capable of proposing I?ve yet to see it.