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Cutting in a transom door

Old 08-13-2020, 09:32 PM
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Default Cutting in a transom door

Hi everyone,, in the process of buying an older 89’ Silverton 40 convertible and love the boat but one of my hang ups is there is no transom door and have kids and wanting to upgrade the swim platform for outings,, anyway I know it has been done plenty of times from what I have read but has anyone ever did it on an older Silverton? Just curious as to any structural issues I might encounter on that model or should I not be concerned and start laying it out and go with it,, thanks
Old 08-14-2020, 05:48 AM
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We ending up putting in a tuna door (leaving the top area structurally intact) for our two large Labradors to get on and off, but us humans still need to go over the transom. The reason we did this was the yard who we have great respect for skill wise told us what ever we do you will still get cracks around the door area. Not to say if a lot of structural work is performed this couldn't be mitigated, but everything comes at a cost.

Now we run the ocean a lot so we kept that in mind when deciding what to do. Now I've seen guys on my dock literally take a saws-all and cut a door and it came out amazing good, plus it was a very low cost, and now here is the detail, they only do bay runs, anchor out etc, so the stresses on the transom area is minimal.

It's all what you plan to do with the boat, but the boat won't break apart by cutting out a transom door if that's what you are worried about, nor do I think you are heading to the canyons in that boat.

Good luck
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Old 08-14-2020, 06:38 AM
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I did it on my '89 40 Luhrs (same hull) for the same reasons you mentioned. There's not much to the transom, just the outer skin and inner liner. No coring etc. We cut the door opposite the hinge on an angle so it can't be pushed in. The transom inside we made up a flange of fiberglass on each side to support the transom wall. Also had to build a starboard step/threshold to go over the cockpit drain channel. It's definitely not as strong as original, but I'm also not concerned about taking large waves on the transom.
Old 08-14-2020, 09:26 AM
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Thanks guys for your replies and input and knowledge on this,, and no we wouldnt be taking it across the Atlantic just maybe Chesapeake bay down the road from time to time and tight along the coast lines for a rare trip to Virginia beach maybe but 90% protected waters and calmer conditions for the most part,, its not that kind of boat that can go way out there anyway,, so that was my main concern about it possibly becoming to weak but doesn't sound like there is a whole lot to it and pretty easy to do besides any glass work afterwards and touch ups and thanks for the tip on cutting on an angle 👍,, thanks again guys for your help and peace of mind,, lol the wife will be happy to hear that one for convenience
Old 08-15-2020, 05:12 AM
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Originally Posted by Transamconvert View Post
I did it on my '89 40 Luhrs (same hull) for the same reasons you mentioned. There's not much to the transom, just the outer skin and inner liner. No coring etc. We cut the door opposite the hinge on an angle so it can't be pushed in. The transom inside we made up a flange of fiberglass on each side to support the transom wall. Also had to build a starboard step/threshold to go over the cockpit drain channel. It's definitely not as strong as original, but I'm also not concerned about taking large waves on the transom.

Smart move. Could the hinge side could be cut at a very slight angle to reduce stress on the hinge?
Old 08-15-2020, 08:06 AM
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Originally Posted by ole_blue View Post
Smart move. Could the hinge side could be cut at a very slight angle to reduce stress on the hinge?
Probably. On that side though the flange for the wall and the flange for the door end up butting when the door is closed.
Old 08-15-2020, 01:11 PM
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Hey I was wondering if I could trouble you for a couple pics of your transom door project on your Luhrs? If not I can fully understand 👍. Thanks again for the tips

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