Modification of transom

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We would like a step thru gate thru the transom to get aboard. Anyone having information on structural design limitations, I would appreciate hearing from you.

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I'm afraid I don't really have an exact picture of your boat's transom in my mind, specifically how deep the cut will be, but in general I think the operation might involve a horizontal stiffening member below the gate. I'm thinking of something on the order of a 4" or 6" x 6" horizontal "ledge" member fiberglassed right below the opening. I think that the remaining upper-transom around the gate will be sufficient to distribute forces to the sides and deck without much if any extra reinforcement.

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There are many design factors to take into consideration for a transom door. The following web page contains pictures of a 27' boat that I built that has transom door. http://www.parasailboat.com If this design is of interest to you I will be glad to offer assistance for your project.