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Old 04-03-2017, 07:37 PM   #1
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Default Trim Tab size and boat performance

I am looking for anyone who has experience changing out their stock trim tabs to enhance their boats performance. I have a 98 2800 SCR single engine 7.4L MPI with Bravo III drive. With 22P props and a 5-6 person load the boat is very difficult to plane. With 2 on board if does fine and operates within the WOT range but load it down and I have to send 3 below deck or it absolutely will not plane. I have been looking at a set of 4by4 props to help with the hole shot but someone mentioned my trim tab configuration on another forum so I thought I would look into it. According to Bennett's website a boat my size should have 24X12 or 30X9 tabs on it. I haven't measured them but I'm sure they're either 12X12 or at most 18X12. I would like to know if anyone has done this and what tab did you choose and what were the results. Quicker planing? Lower Cruising speed/RPM? Better tab response side to side?
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Old 04-03-2017, 10:25 PM   #2
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Bennett also sells a kit to add end wings, don't recall the official term that bolt to the side edges of the tabs that folks have reported help as well. Tom (Tabman) from Bennett posts to many forums including this one. Try sending him a PM and have him post a response to this thread.
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Old 04-03-2017, 10:30 PM   #3
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thanks, I have seen that name somewhere, maybe here. I'm just wondering why would Maxum put such small tabs on the boat if they need to be bigger to function properly? Did they think the extra surface area would create too much drag and the engine wouldn't have enough grunt to overcome it?
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Old 04-03-2017, 10:36 PM   #4
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Quote:
Originally Posted by Chillaxintoo View Post
thanks, I have seen that name somewhere, maybe here. I'm just wondering why would Maxum put such small tabs on the boat if they need to be bigger to function properly? Did they think the extra surface area would create too much drag and the engine wouldn't have enough grunt to overcome it?

Who knows could just be to save money but lots of boat builders have installed small tabs. IMO a single engine heavy boat is going to suffer in time to plane with 5 or more adults based on my experience. Props and tabs help but torque of one engine on a boat over 8000 lbs will notice the load.

My 2400 SCR with a 5.7 planes slower with over 4 adults.
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Old 04-03-2017, 11:14 PM   #5
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Yeah, I lot of mass and a lot of water to push. I'm just trying to make it perform the best it can. I'm not looking for runabout performance, just respectable
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Old 04-04-2017, 12:02 AM   #6
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Yes bigger tabs can really help. To help best I would like to know the current size and if at all possible see a picture of your transom.

They will do all you are looking for.

Tom McGow
Bennett Marine
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Old 04-04-2017, 12:23 AM   #7
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Boat is a 1998 Maxum 2800 SCR 9'8" beam, 6500# dry weight, 28' long. I'm 250 miles from the boat and it is in the water so a transom pic might be tough. I'll see what I can find. The tabs that are on it are the factory originals. I think they are 12 X 12 if I recall correctly. I can tell you that when I adjust them I get very little side to side adjustment. In your experience, do larger tabs help when your boat plows a lot and struggles to plane when you have a larger passenger load?
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Old 04-04-2017, 12:36 AM   #8
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This is not our boat but is a 2800SCR, tabs look to be the same size as our and location is similar.
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Old 04-04-2017, 12:46 AM   #9
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2000 Maxum 2800 SCR Miami FL for Sale 33193 - iboats.com

Image didn't seem to load, this is a link to the photo
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Old 04-04-2017, 01:05 AM   #10
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Those are Lenco tabs and they do look like 12 x 12s. 18 x 12 would be better and would really help with what you want to do.

But you would have to move the actuators to be in the middle of the tab side to side.

If they were Bennett I would suggest 18 x 12 with 3 inch drop fins to get the most lift, but they are not really compatible with Lenco actuators.

Tom
Bennett Marine
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