Bouncing boat

grinch1166

Recruit
Joined
Jul 25, 2011
Messages
1
I am new to boating. I have a 2004 Ranger with a 150 Yamaha. I fish small lakes in KY so I can't get up a lot of speed. This is my first boat with electric trim and I can't seem to get the trim right. When the boat levels out, it bounces like crazy. What am I doing wrong?
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,778
Re: Bouncing boat

If the boat is roughly in the condition it was in when new and you haven't changed much of anything you just need to get used to your boat.

The position of the engine with respect to the hull determines your performance. When getting up on plane (hole shot) performance is improved if you have the engine "tucked in" whereas the lower unit is parallel to the transom.....propeller closest to the boat.

As you get on the water (15-20 mph) the boat picks up speed as do engine rpm's and you are "on the water". If you keep your original trim position the boat will "plow" meaning the bow (front of the boat) will be digging into the water and your speed will be reduced for a given throttle setting and the boat will be hard to steer.

Once on plane, start trimming the engine "out"....pushing the propeller away from the boat. The bow will lift out of the water as you do, speed will increase and rpms will too for the same throttle setting.

If you continue to trim out without changing anything else, the bow will come up too far and become unstable which is called porposing (bow goes up and down) or what's called "chine walking" where the boat rocks from side to side......chine walking usually only occurs at very high speeds when you are running your boat faster than it was designed to run.

To stop the porposing you created, either increase your throttle until the boat settles down, or reduce your trim setting (tuck it in) till it settles down.

If you are at high speed and are trimmed out, if you reduce your throttle the boat will probably start porposing. To stop it, if you want to run at the slower speed, then just tuck her in (trim in) until the boat stabilizes.

Play with it and give your self time to get used to it. You'll really enjoy it.

HTH

Mark
 

jtmarten

Master Chief Petty Officer
Joined
Aug 2, 2004
Messages
825
Re: Bouncing boat

+1, that's about it. Trim down just a bit when she starts porpoising. You may want to poll Ranger owners with similar setups and see what prop they're running. The prop has a huge impact on how she rides.
 

BigMuddy

Recruit
Joined
Aug 27, 2011
Messages
5
Re: Bouncing boat

If the above remedies still leave you dissatisfied, you could look into some self-actuating trim tabs.
 

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: Bouncing boat

nice post texas...

thanks for taking the time to type that out
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,778
Re: Bouncing boat

nice post texas...

thanks for taking the time to type that out

Thanks OOPS, and your being a senior member, I take the response as a compliment. I am on here to help folks with my limited experience....experience in the area where I boated over the years, plus applying what I can get out of my service manual, and finally applying what I call common sense (my to be understood version of) to a problem.

In addition, I am retired and use the forums to maintain my typing skills and keep my brain active.

Last, I was successful in industry by breaking a problem down to it's smallest elements and understanding the part each part played in the overall function. By doing that, troubleshooting was merely detecting what didn't fit the task it was designed to do.

I miss some, like understanding fuel and how it does it's thing, but there are plenty of folks on here to keep the tales acccurate.

Mark
 
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