trim tabs on a 23 tsunami

[bobfish21]

Ive finally decided to get up enough nerve to drill holes in my new transom of my 23 tsunami i/o and install a set of tabs.need some input as to what size i'd need,as well as location.do I put them on the extreme outboard deadrise sections of the transom,the middle sections(most likely)or(least likely)on the bottom portion of the hull?leaning towards thelenco electric tabs for ease of installation,but if anyone has had negative experiences with these I could be talked into the bennet hydraulic units.thanks for any and all advise!
also,like to thank those responsible for theboating magazine article on the 73 tsunami-I finally know how much fuel my boat holds.

[Tabman]

Bobfish21,

The unique shape of the SeaCraft hull influences where Trim Tabs are mounted and what size can be used. Take a look at this picture of Scott McLeod's 1982 23 Sceptre (hope he doesn’t mind!). You can see that the Tabs are mounted outboard towards the chines. This is the best position for Trim Tabs to give the optimum combination of side to side and fore to aft trim. Also it is important to note that the Trim Tabs stay on the running surface of the first “step”. To be effective trim tabs must be mounted near the bottom of the transom so that they contact the water flowing off the bottom of the hull when the boat is running on plan. If the Trim Tab were to run further towards the keel than the first step, the part of the Trim Tab that was not close to the bottom of the hull where it ran into the next step would not make good contact with the water flow and would produce little or no lift. If you look at Scott’s Tabs you can see that they stay within that first step. They are 12” x 12” Trim Tabs and likely do a good job trimming the boat. You could also use our M120 10” x 12” Sport Tabs.



I hope this is helpful.
Tom McGow
Bennett Marine

[ February 02, 2003, 08:53 PM: Message edited by: Tabman ]

[SECF3114M73J]

Tabman is right on the money. I've got 12x12's on my 23' mounted in the same location as Scott.bobfish in your other post you refer to a vee hulls tendency to lean into the wind, I have a cc so this causes a good deal of spray to hit the helm area. With the tabs I'll raise the windward rail higher than level, which cuts out most of this spray.

[ February 03, 2003, 12:09 AM: Message edited by: SECF3114M73J ]

[ScottM]

Tabman, no problem using the picture. I'm glad it could help in your explanation to bobfish. Now, just send me your address so I can send a bill for using it [img]images/icons/grin.gif[/img] , or perhaps a future discount on new tabs? [img]images/icons/wink.gif[/img] Hehehe.

Those are Bennett 12 x 12's, not sure of model, and they do a great job of adjusting the boat's attitude. We've found the adjustment from side to side is what we need most, seeing as the boat has a list to port when on plane, perhaps from prop torque.

[Billybob]

I'd take a hard look at the Bennets over the Lenco's.I really don't think the install is much harder, and you can't beat their service.