trim ?

[rbrown053]

only have been boating for little over a yaer my question is im not totaly sure the right way to trim out my 17 ft bayliner trophy CC 85hp force is their any place to learn waht the correct way to trim out. not sure where to post this

 

[Bifflefan]

Re: trim ?

I think this a good place to post it.

Start with the trim all the way down (assuming you have power trim), then after you get on plane, look at the speedo and tach.
Leave the throttle where it is and trim up a little, you should pick up speed and rpm, throttle back to the rpm before you trimed up, then trim up a bit more. Each time you do this you will gain a little until you reach a point that the bow will start to bounce (maybe), or you hit the end of the trim, or you loose speed.
There is a "sweet spot" that is different in every boat. That is the best speed with the least amount of throttle to maintain that speed.

If you dont have power trim, Try each hole one at a time until you find the best general hole, then use it. For my old boat it was hole 2 with 2 people and hole 3 if more than 2 people.

Hope that helps you.

 

[rbrown053]

Re: trim ?

will try that the next time im out still have to correct my compression issue first but will hope im out before it gets cold

 

[blifsey]

Re: trim ?

As bifflefan said, trim out in little increments watching speed/RPMs. In addition to the bow bouncing/porpoising, you may reach a point where the prop starts slipping instead of biting the water. This is called cavitation. If you do, the speed will likely drop and the RPMs will jump higher. Cavitation is to a car loosing traction and spinning its tires. If you are either porpoising or cavitating, trim down just a touch until it stops. My old 17' bass boat would porpoise first. Current 20' bowrider will cavitate first.

Also, when going into a sharp/hard turn, you might want to trim down some. This is because the boat will lean bringing the prop closer to top of water. If it leans enough the prop can cavitate.

When slowing down, you can also trim down after cutting back on throttle. The extra drag from lower unit will help slow you more and could bring bow down for better view.

In rough water, it can be best to trim down so the steeper V on bow cuts through the waves/wakes. This can vary among boats so you need to experiment to see what helps smooth ride the best.

 

[rbrown053]

Re: trim ?

thanks guys everthing that i ask gets answered quick and with good knowldge and has work .as i have said thanks I BOATS kicks butt

 

[skargo]

Re: trim ?

Cool little animation.
http://www.motorboatmuseum.org.uk/learning/trimming.html

 

[dsiekman]

Re: trim ?

In rough water, it can be best to trim down so the steeper V on bow cuts through the waves/wakes. This can vary among boats so you need to experiment to see what helps smooth ride the best.

+1 here. I got a new to me boat this spring. Still getting used to it. The old boat - a Cobalt 252 (bowrider) - did better trimmed all the way down in the chop. The new boat, a Cobalt 293 (cuddy), likes to be trimmed up fairly high in the chop. However, with the bow down she turns like a sports car...with the bow up like a...well, like a boat.

 

[a70eliminator]

Re: trim ?

cool little animation.
http://www.motorboatmuseum.org.uk/learning/trimming.html

112 mph

 

[skargo]

Re: trim ?

112 mph

Seems to be the max.