trim tabs on a 23 tsunami

[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 ]