We've had our '67 Commander 31 for several weeks now and are really enjoying her! After a few short jaunts it's becoming apparent to me that Trim Tabs would be very useful indeed.

I've been reading all I can about them and am zeroing in on Bennetts. From what I read it seems to me that 30" x 6" would be about right (agreed?) This will probably be a winter project as I've arranged for inside heated storage.

There's one little thing that has me wondering though. Where have those of you with tabs installed mounted the switch(es)? I have a rather unusual helm configuration, see the attached pic. TrueNorth%2006.30.16%20%2824%29.jpg

I'm not sure if this is original or not, but it's what I have. Any suggestions &/or photos of the tab switch(s) location would be very useful!


Greg - Green Bay

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Well that's the other dilemma, what to make the curved shims out of and how? When I thought I was going to get this done in time before launch last spring, I made a set out of UV resistant plastic lumber. The stuff will never rot and is just as easy to work with as wood. I tried to cut them on a band saw, and they just didn't turn out very well. I'd be more than willing to listen if anyone has any ideas on how to make them! 

Here's what I've got so far...

Plastic lumber is what I was thinking of. Idk if it’s the best to use or not though. Those don’t look too bad, remember you’ll be bedding them in adhesive so they don’t have to be perfect.

To my knowledge the tabs on my '68 35 were added early in it's life.  The transom contour was filled with mahogany or teak, the through bolts are bedded into the transom slightly above the hull, my hull is flush at the transom so the bolts are probably one or two inches above the floor inside the transom. The wood is still in good, eroded, condition, I am grateful, idk if I would have the patience or talent to match the contours, maybe talent but certainly not the patience.  Plastic lumber is probably a better option but hull was built in late 1967 so the 50th year really has past and the wooden spacer is good so choose 50+ or 100 years as the choice spacer.

Mike, I hadn't considered bedding/gluing the shims to the transom's surface. I figured I'd just squirt 4200 in the holes before screwing the whole thing on the back. Now that you mention it, I suppose it IS a good idea to bed the whole shim in adhesive. I'll do that and mount them loosely so as not to force out all the 4200. Once set, it will become a big gasket and I'll finish tightening.

That makes me feel a whole lot better about the shape of the shims not being "perfect". Thanks for the tip!

Mike H said:

Plastic lumber is what I was thinking of. Idk if it’s the best to use or not though. Those don’t look too bad, remember you’ll be bedding them in adhesive so they don’t have to be perfect.

In the center roo of helm is a typical location. If your gas tanks are in front of the transom make sure you run them dry so you don’t have to mess with fuel transfer. If tanks are elsewhere it is an easy install.

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