To: | Swiftsolo <swiftsolo@xxxxxxxxxxxx> |
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Subject: | Rudder rip-off |
From: | Dave Lindsey <lindsey@xxxxxxxxxxx> |
Date: | Sun, 09 Sep 2007 22:14:42 -0700 |
Thread-index: | AcfzaX5VvRV4wV9cEdy5OAADk0R7GA== |
Thread-topic: | Rudder rip-off |
**Just a little info I thought I would pass onto other builders.** My rudder pulled off my boat today. Mike offered to sail the Red Violin as a sort of sea trial. It was a beautiful day with winds at about 12-15 kts. Mike pushed off with no problem. I watched him as he sailed her close hauled west of the pier. Later I watched as he very skilfully doused the main and struggled to come in on the jib alone. Eventually it became obvious he required some assistance. The rudder had completely ripped off the boat. See the attached pictures. I think it is fairly obvious what happened. A strong bending moment bent the pin which lead to the upper gudgeon block pulling away from the bar. I think this lead to the lower end of the pin bending and the whole works falling off. If my assumption is correct, the lesson is that we need to eliminate all bending moments on the pin. Do not use a spacer as I did. Keep the rudder box attachment point as close to the gudgeons as possible. Shear is acceptable, but try to eliminate any and all bending moments. Now I have to figure out how to fix this mess. Any suggestions. No smart ass remarks please? Oh, one final point; I used screw (4) to attach the gudgeon to the bar. I'm glad I did. I very purposely wanted this to be a failure point vs. breaking the bar. Now I question if the rudder box should be designed to pivot with a shear pin. Comments? David Lindsey CAN 046
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