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Old     (monstertower)      Join Date: Mar 2003       04-09-2003, 1:36 PM Reply   
Just wanted to share what we (OK, A really smart retired engineer named Wayne) came up with for mounting towers to a curved surface. We were not able to find anyone who had addressed this problem yet, so here's what we've come up with.

- - Skip this paragraph is techie stuff bores you - -
On a rectangular base the axis of the curve will likely be in the long direction of the base so by opening up space in the center of the base pad (that goes between the boat and the base) it allows it to "straddle" the curvature of the boat. By using a radius on this edge, as the base is tightened it allows the material to "mush" to match the contour. The correct material & durometer of the pad was the hard part. By using a much thinner edge on the ends it allows the pad to contour to the boat curve. An added benefit is it moves the pressure away from the boltholes, lowering the stress on the gelcoat at the holes, which should reduce chances of stress cracks.

See picture below or at

Love to get some comments on the idea.


Old    jmccallum            04-09-2003, 2:05 PM Reply   
So you're basically making a clamp that pinches the fibreglass sandwich further away from the holes. Should work... anything you do to spread the load should help. My one caution is that it may preload or deflect the fibreglass and induce a stress. Depending on the direction it may be additive to the stress due to line load on the tower and make things worse.

Ideally, you match the curvature of the fiberglass and just clamp it. My little angle here may not be a concern most of the time. However, watch out for DIY'ers that crank them down and have cracks before they even mount the tower.

Does any of that make sense?
Old    jmccallum            04-09-2003, 2:06 PM Reply   
Ops... wait a minute took another look. You don't actaully change the curvature of the fibreglass do you?


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