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Old 03-08-2014, 11:58 AM   #1
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Default Trim tabs improvement

Hi All,

Currently I have trim tabs 12"x8" which came with the 25' boat maxum 2500 single mercruiser 5.7 about 6000lbs. I'm on the east coast mostly cruising in open waters which often are pretty rough. I did some researches online and according to some manufactures 12x8 wouldn't be efficient and they recommend 1" of tab per each foot of the boat length. I was wondering if it will make sense to change them to larger tabs maybe 18x8 so I could stay on the plane at lower speeds.
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Old 03-08-2014, 12:40 PM   #2
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Can you even fit that wide of a tab on your boat?

While tabs help planning there primary function is to get the bow down while climbing onto plane and compensate for minor side to side weight offset.

Maintaining plane is a function of HP/RPMs.

I am sure TabMan will be able to provide a much better response.
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Old 03-08-2014, 03:03 PM   #3
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18" should fit with no issues. From my small experience keeping the bow down helps to handle rough water for which I'm exposed a lot. That will be the main reason for me to change the tabs to larger. Is there any downside of having large tabs? The bottom line I won't have to drop them down that much to achieve proper balance.
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Old 03-08-2014, 03:25 PM   #4
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The larger the tab area th more drag but with all the other effects from current and wind it really isn't noticable.

TabMan (Tom from Bennet trim tabs) has started posting on this site an I am sure he will respond with the best answer for you.
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Old 03-08-2014, 07:03 PM   #5
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Thank you Mike! Very helpful, as usually
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Old 03-08-2014, 11:13 PM   #6
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Your welcome.

Just being myself, boat nut :-)
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Old 03-09-2014, 01:28 AM   #7
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Actually the larger the Trim Tab the less drag it makes in relation to the lift it generates. This is because it has to be deflected less to make the same or more lift than a smaller one. The larger the Trim Tabs the lower the speed you will be able to stay on plane.

Do you know if you have Bennett or Boat Leveler brand Trim Tabs?

Also do you have a photo of the Tabs that you can post?

Let me know and I will be delighted to help!

Tom McGow
Bennett Marine
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Old 03-09-2014, 01:17 PM   #8
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Tom,

Thank for valuable info.

Attached are photos of existing tabs. It looks like its a boat leveler system. What will be preferably the size of proper tabs? It looks like I can fit 18" wide tabs but if it make sense I could move transducer to accommodate even larger tabs.
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Old 03-09-2014, 01:23 PM   #9
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Old 03-09-2014, 01:43 PM   #10
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Tom/forbes regarding the 1 inch of tab per foot, is this for both tabs combined? 2: 12" tabs = 24 which is thesize of this boat.

forbes how slow of a speed are you trying to maintain plane? Yes the larger tabs will help but at some point lck of power rules and the boat will not plane
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