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Author Topic:   Trim Tabs on 21 or 23 Conquest?
Treypescatorie posted 03-23-2005 12:18 PM ET (US)   Profile for Treypescatorie   Send Email to Treypescatorie  
Has anyone put Trim tabs on this hull. Whaler used 9x9 as an option on this boat.9x9 seems too small. I want to install lencos on my 21 cq and whould like to know what size other people used?
Thanks Paul
kingfish posted 03-23-2005 12:40 PM ET (US)     Profile for kingfish  Send Email to kingfish     
If you have room, I'd recommend 12x12s - that's what I have on my Outrage 22 and Parker 2520, and they do the trick nicely.


David Pendleton posted 03-23-2005 01:13 PM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
My 23 Conquest came with (Bennett) trim tabs from the factory. I don't recall what their dimensions are, but I can tell you they are a great help in rough water.
rtk posted 03-23-2005 02:02 PM ET (US)     Profile for rtk  Send Email to rtk     
My 1997 21 Outrage came with Bennett 9x10 or so trim tabs. The boat responded well when the trim tabs were used, so it does seem that size is adequate, for the 21 foot anyway.

I looked at a new 21 Outrage at a dealer, they also seem to come stock with the nine or ten inch square trim tabs.

The Lenco trim tab site recommemds the 12 x 12 tab for this size boat. The Bennett site, with their standard tab recommended something close to an 18 inch wide (hinge width) by 9 inch.

I am installing the Lenco 12 x 9 (9 inch hinge) on my boat soon. I am hoping the 12 inch tab will get the bow down a bit more for slower planing speeds.

I did not want to go to the 12 inch wide hinge model because I did not want to mess around with repairing the old holes from the Bennetts where the actuator mounts.

If you are starting clean I think the 12 x 12 inch size tab would work well for the 21-23 foot boat. Check transducer locations. The Lenco website has the installation manuals right there.


Treypescatorie posted 03-23-2005 03:19 PM ET (US)     Profile for Treypescatorie  Send Email to Treypescatorie     
As far as the tab length goes, I dont think that I can go bigger than 10"(due to swim ladder). So ill probibly stay with 9'' on that dimension. Acording to lenco a 9x9 is for a 14' to 18' boat. I think the lenco 9x12 would be good for my boat, but they say that you cant place the tab with in 2" of a strake edge? I think the 12 would put it just over the the strake edge. The 9x18 would solve this problem but 18" seems to big. How close can the transducer be to the trim tab?
rtk posted 03-23-2005 04:29 PM ET (US)     Profile for rtk  Send Email to rtk     
Lenco does make the statement in their instructions about the strake edge, Bennett says it does not matter. Who is right? I don't know.

I would contact both manufacturers and discuss it with them. A call to Boston Whaler for their opinion would put you on the right track too.

My transducer is pretty close to the starboard trim tab, mounted so the flat surface of the transducer is level with the flat on the "strake". It is not a typical place to mount a transducer, but the fishfinder reads well under all conditions. I mentioned the transducer just to make you aware when planning the install, I really don't know if there is a set measurement. Far enough away that the trim tab will not disturb the water flow across the transducer surface.


dauntlass 18 posted 03-23-2005 06:06 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
My 21ft Conquest has Bennett 12x9 tabs which I installed.It also has a Dole fin on the motor.I think the Dole fin did more to get the boat on plane at lower rpm than the tabs.The tabs help but trimming the motor in the way I run the boat works well.With a heavy load on one side of the boat a little tab helps level things.Trimming the motor on this boat really raises or lowers the bow quite well.
BW23 posted 03-23-2005 07:17 PM ET (US)     Profile for BW23  Send Email to BW23     
I have a 97, 23 Con equipped with the fatory / Bennett 9" x 9" tabs.

Performance was OK for lateral stability. Poor for bow down.

I recently purchased a pair of Bennett 9" x 18"(width)planes and plan to install them in a few weeks.

The swin ladder prevents you from installing 12" cord size.

Performance results to be posted later.

Backlash posted 03-24-2005 09:19 AM ET (US)     Profile for Backlash  Send Email to Backlash     
I agree with kingfish - get the 12"x12" tabs. The 9"x9" are, IMO, way too small. Any of the deeper "V" post-classic Whalers will benefit from trim tabs.

I put 9"x12" Bennetts on my 21' Walkaround over 10 years ago and they work very well, but I wish I had gone with the 12"x12" tabs. Are you sure you don't have the 9"x12" Bennetts? If so, you can upgrade to the 12"x12" tabs by just buying the 12"x12" planes...they will bolt on to your present hinge pieces and actuators. I'm considering doing this.

I believe, but don't know for a fact, that Boston Whaler undersizes their trim tabs for liability reasons. With larger trim tabs an inexperienced operator could fully lower the tabs at speed and lose steering control.


rtk posted 03-24-2005 10:19 AM ET (US)     Profile for rtk  Send Email to rtk     
Steve, the Bennetts on the boat are square, and do measure roughly 9-10" square. The nine inch hinge of the new Lencos is the same size as the Bennett tabs that were removed.

I do agree that the optimum size for the boat is more than likely the 12 X 12.

I'm going to start with the 12 X 9 and see how they work out. Thought about just getting the larger tabs and just use the existing actuators. That would have been the easiest.

The switch to the Lencos appealed to me because I don't have to worry about fluid levels, leaks and that stuff. I don't think you can go wrong with either product, just wanted to try something different. The Bennett system is eight years old, so I figured I would update the entire system while I am playing with them.

I appreciate your input, I do agree with you, we will see how it goes. I guess I could always switch out the tabs to a larger size if I am unhappy with them.


kingfish posted 03-24-2005 10:38 AM ET (US)     Profile for kingfish  Send Email to kingfish     

Both my sets are Lencos, and I am very happy with them. Less difficult install (less stuff to deal with) and quicker response.

Backlash posted 03-24-2005 12:20 PM ET (US)     Profile for Backlash  Send Email to Backlash     

I don't blame you for going with the Lencos as they do seem to have much quicker response than the Bennetts. I also like their very compact trim indicator/switch unit.

BTW, kingfish and I switched boats last fall and I don't think he ever got the trim tabs properly deflected due to the lag time...he was used to the instant response of his Lencos! I know he has been very happy with them


kingfish posted 03-24-2005 11:28 PM ET (US)     Profile for kingfish  Send Email to kingfish     

You're probably right. It's a funny thing how one gets used to how your own boat operates; operating the tabs for me (on my boat) is transparent. I can feel right where they are and where they are correctly adjusted. But on another boat, like yours, I feel like I'm all thumbs, and I can't get a feeling for them at all. I thought they were trimmed down. It was a real pleasure driving that beautiful boat of yours though - hope we can get together again soon.

Heading towards Apalachicola in the morning - see y'all in a couple of weeks-


kingfish posted 03-24-2005 11:30 PM ET (US)     Profile for kingfish  Send Email to kingfish     
Who's ohn? Must have meant John...
rtk posted 03-25-2005 07:12 AM ET (US)     Profile for rtk  Send Email to rtk     
Thanks John & Steve, I did not know the Lencos are faster. And good to hear they have been a good product. I am looking forward to testing them out in a couple weeks.


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