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post #6 of Old 03-26-2008
sailingdog
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Chris-

Most kickup rudders have a serious problem with trim tabs for wind vanes. The kickup rudder has a pivot point, and the trim tab needs one as well... however, the pivot point for the trim tab has to accommodate the movement caused by how far from the rudder's pivot point the trim tab is located. So it generally has to slide as well as pivot—or otherwise accommodate the horizontal and vertical components of the rudder kicking up. Making something like this isn't easy or simple, especially if you're trying to make it so that it doesn't interfere with the windvane or rudder's functions. It also has to allow for transmitting the turning movement past the pivot mechanism without damaging the pivot mechanism or torquing the trim tab's shaft out of alignment.

Quote:
Originally Posted by chris_gee View Post
Surely the shaft that turns the tab is vertical and attached to a horizontal plate. Is there a problem making that attachment able to turn vertically fore n aft with a pivot bolt through a bracket?

Sailingdog

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