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Old 07-24-2018, 11:39 AM   #1
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Mainship 35/39 1999 swim platform

Would like to mount Weaver dinghy davits on platform. Have no idea how it is built, all fiberglass / fiberglass wood, how thick any problems with doing this? Would appreciate some knowledge on this. Hard bottom inflatable 10'6" Aquascan How would one detect leak if there was one. Jay
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Old 07-25-2018, 06:12 PM   #2
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thread moved from "How To Use The Forum, Site News & Account Concerns" to "Mainship" subforum.
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Old 07-25-2018, 06:15 PM   #3
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The 1999 would be a 350. Does your swim platform have the recall work done? It would have either 2 or 3 access hatches in the top of the swim platform if it does. There should be no issues with installing mounts into the deck of the platform.
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Old 07-25-2018, 06:28 PM   #4
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Welcome aboard.
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Old 07-27-2018, 04:48 PM   #5
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Having trouble using system. Thank you for your reply. No hatches. Should I install? Called Marlow and got no info. Would make sense to be able to view sump in platform. Hope this gets to you. Jay
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Old 07-27-2018, 05:12 PM   #6
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Will keep trying

Not getting system function, will figure it out, Hope posts have gone out. Jay
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Old 07-27-2018, 05:16 PM   #7
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Do I install hatches? Any suggestions. Jay
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Old 07-27-2018, 05:26 PM   #8
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I donít think anyone is having any luck getting Marlow to support the older Mainships. I donít own one, but I think the recall had to do with water getting into the swim platform. I believe the recall included putting in access hatches and maybe installing a bilge pump. I would also check around the swim platform where it is attached to the hull for any stress cracking. Good luck.
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Old 07-27-2018, 06:29 PM   #9
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The recall was to remove the top of the platform, dig out the foam that Mainship installed inside and then add access hatches to the top of the platform. I'm not sure if any of this was actually necessary as water will continue to get inside. Every year when I pull the boat i remove the drain plug from the bottom of the platform and get between 1-2 gallons. I don't think installing the hatches will do you any good as the foam would still be inside. Next time you pull the boat look for any possible stress cracks where the platform mounts to the hull. I get them on occasion right at the water line. However i dont think that is where the water is coming from. I dug out the caulk at the top of the platform where it meets the transom and recaulked. I'll know in November if it worked.
As far as the Weaver davits are concerned, we have them and they work great. the platform is plenty strong enough and we have rood to walk on the platform between the dingy and transom when the dingy is in the up position.
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Old 07-27-2018, 07:39 PM   #10
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We looked at one before buying our current boat. It had the recall done and they installed a bilge pump. When we were on the boat it did pump some so maybe some boats take on more water than others? It would be fun to remove all the foam. We had a Triumph that was foam filled. When I added some cleats it was tough to get the foam out. I finally used a drill with a flexible extension and used a drill bit on the end to sort of route out the foam. With large access hatches and the larger interior area the swim platform may be easier than the small tight areas I was working in.
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Old 07-28-2018, 10:02 AM   #11
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Thanks to all

What a great resource Thank you for your knowledge it was truly a help. Am now confident to install dingy davits, Jay Hope this gets to all who took the time and effort to help.
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Old 07-29-2018, 02:36 PM   #12
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350s/390s, and especially the swim platform 'issue', have been extensively discussed in the Mainship Yahoo group.

Yeah, in 2018 Yahoo s*cks, but there is a LOT of good information about Mainships there that has been accumulated over the years.
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Old 07-30-2018, 09:55 AM   #13
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Thank you, as soon as I figure it out I will post picture of JUSTINA C. Jay
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Old 07-30-2018, 01:07 PM   #14
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With the insulation in place, there is no means to remove the water. In most cases, three holes were cut into the deck of the swim platform. This is because there are two small bulkheads splitting the cavity of the swim platform into 3 sections. One hole is cut in each section and the foam and water removed. The holes were replaced with deck hatches. some have to manually remove the water. some installed a bilge pump. It looks like at least one installed a new garboard plug.

There will be no way to install washers or a nut to bolt on a davit without getting access to the interior of the swim platform. There will be no way to get an arm and tool in there with the foam still installed.

You might be able to use a toggle-style seatpost mounting but I would be more concerned with getting the foam out of the swim platform at this point.
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Old 07-31-2018, 10:40 AM   #15
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Shrew, Are the compartments the same size, if so I can determine a center line for each of the hatches Jay.
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Old 07-31-2018, 12:06 PM   #16
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Hi Jay,
if i remember correctly from when I had mine done, the compartments are divided by the trim tab actuator locations. If you look from the bottom the tab rams are in pockets, these pockets create the divisions. The real purpose for the access plates being cut into the swim platform lid is for trim tab fitting service. If it is of any assistance to you I have the original Mainship work instructions, including drawings, in a PDF format. PM me if you would like them,
Gary
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Old 08-01-2018, 10:41 AM   #17
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Gary, I would truly appreciate the file. Thank you. Hope one day I can help someone as much as this thread has helped me THANKS TO ALL. Jay
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Old 08-02-2018, 08:21 AM   #18
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If you place your first hatch dead center in the swim platform, once you remove the foam, you'll see the two bulkheads. You can determine where to place the other two hatches from there.
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Old 08-02-2018, 09:54 AM   #19
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Hi Jay,
PDF's attached, if they do not come through PM me, thanks and good luck, Gary
Attached Files
File Type: pdf Mainship.pdf (642.0 KB, 79 views)
File Type: pdf Mainship2.pdf (272.5 KB, 51 views)
File Type: pdf 39-Trawler swim platform bolt location.pdf (221.7 KB, 57 views)
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Old 08-02-2018, 09:54 AM   #20
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Thanks for allowing me to put my MIND IN GEAR great help as usual Jay
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