Cant keep my boat level port to starboard when plane - Maxum Boat Owners Club

fbhvelocity · 06-29-2014, 06:01 PM

my boat is a 2000 Maxum 2800 SCR with twin 4.3 B2 with 3 blade alu props.
When i get the boat on plane I have a hard time trimming the trim tabs to keep the boat level on side. It tilts very easy from side to side. I consider myself as a experiend driver and I know how to do good trimming with both trim tabs and the drives. Last year I installed a Bennett trim computer to see if it would do the work for me as I need to have my hand on the trim tabs all the time to correct the boat. It is helping but its still a uncomfortable ride as it keep on adjusting.
Everything under the boat seems fine and trim tabs is working probably. The more people in the boat the worser it is?

Thanks Finn, Denmark

mmwjr · 06-29-2014, 11:21 PM

Finn welcome aboard.

Are the tabs from Bennett? Maxum used Boat Leveler on a lot of it's boats.
Are folks moving around a lot which will keep throwing the trim off?
Small adjustments at a time and wait to see how the boat reacts.
Wind and current will impact trim.
Have you tried trimming the drives as well?

Are the drives set up for counter rotating? Props same diameter and pitch?

fbhvelocity · 06-30-2014, 08:06 AM

Quote:

Originally Posted by mmwjr

Finn welcome aboard.

Are the tabs from Bennett? Maxum used Boat Leveler on a lot of it's boats.
Are folks moving around a lot which will keep throwing the trim off?
Small adjustments at a time and wait to see how the boat reacts.
Wind and current will impact trim.
Have you tried trimming the drives as well?

Are the drives set up for counter rotating? Props same diameter and pitch?

-Tabs are from Bennett and came with the boat from factory.
-Boat is VERY sensitive if folks are moving around
-Small adjustments, YES but the boat still tilt over alot
-Wind and current...I know but boat act way more sensitive than you would expect.
-Trimming the drives help and I use them all the times however it seems like the boat like the drives to be trimmed as far Down as they can.

Drives are setup with counter rotation and props are from factory 18 X 19"

What I do is getting the boat on plane with the tabs and drives Down position. When its on plane lets say 22 Knots I trim the tabs up until I get the fastest speed I can get (Minimum Drag from the tabs) With the level computer ON it correct small amount at the time but stil the boat goes slowly from one side to the other.
Totally flat Water and zero Wind is the same.

I talked to other 2800SCR owners but they cannot reconice this. They have single engine installation througt.

mmwjr · 06-30-2014, 12:50 PM

Going to have to see what other 2800 owners with twins have to say, hopefully they will chime in soon.

Phillbo · 06-30-2014, 03:25 PM

How does it act with the computer turned off? Can you trim it manually?

shrew · 06-30-2014, 04:02 PM

Trim the drives out more. If you are running with the drives all the way in then the boat will tend to lay onto one side or the other. Trim the drives out to get back to the planing portion of the hull.

fbhvelocity · 07-01-2014, 10:29 AM

I can trim manually but I need my hand on the dash to control the all the time. It was the reason I installed the computer last year.

I will try trim the drives out more and see what happens. I run twin V6 190 HP and cruise 21-22 Knots with about 36-3800 RPM. This is the lowest speed I can cruise with the feeling that the boat is 100% planing. Any believe that stainless steel props will help on this?

Lawnman · 07-01-2014, 11:25 AM

I have a 98 2800 scr ,with twin v6's ,always start with trim tabs all the way up and slowly adjust when on plane to level boat. On mine very small adjust needed to level. Mine cruises at 3100RPM's. Your tabs are putting to much drag on the boat.

fbhvelocity · 07-01-2014, 11:41 AM

Ok Seems like something is amiss with the high RPM I Run. What prop pich do you run? Mine is 18-1/4 x 19" alu. WOT is 4600RPM. I think I read somewhere that the 4bbl V6 turn 18-1/4 x21" ? It would be nice if I could get cruising RPM Down. Do you know your GPS speed at 3100 RPM?

Normally I use the tabs full Down to get on plane then I trim them all way up and adjust from there. It might be the combination with full Down drives that makes it tilt over side.

Thanks

Phillbo · 07-01-2014, 02:46 PM

Sounds like you are experiencing what I call Bow Plow... get the bow up.

Baby Blue · 07-01-2014, 05:14 PM

I have the same problem with mine. '98 2800 single engine bravo 3. new boat for me this year and I chalked it up to a tall center of gravity boat although my RPM is about 3200 cruise at 25 mph.
BB

fbhvelocity · 07-01-2014, 06:29 PM

I will try some of the said things saturday. Thanks for helping me

jamanati · 07-04-2014, 01:21 AM

One of the comments was about bow plow, where the bow is not up enough. Definitely trim the drives out, pushing the bow up. I had a similar issue with my 3200 and it wasn't until I got the bow up did it drive right/safe, definitely worth a try.

fbhvelocity · 07-07-2014, 05:37 PM

It was "bow plowing" If I trim the drives out enouht to lift the bow (more than I would think it need) I dont even need the trim tabs most of the time. Its very stabil over the side. The side effect is it start bouncing very easy and there is a hair thin limit to how much I can trim out to avoid this.
its a totally different initial settig of the drive and tabs now and I might need some more practice. With full gas tank and 5 people onboard it need minimun 22 Knots (25 Mph) to stay planing.