1981 Dolphin 20' Commercial

Questions about boat repairs with our resins and fiberglass: hull patches, transoms and stringers, foam, rot etc.
Jaysen
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Re: 1981 Dolphin 20' Commercial

Post by Jaysen » Wed Jun 06, 2018 7:08 pm

Sell him on the SOB tool. I’m surprised I’m the one bringing it up.



MSRiver
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Re: 1981 Dolphin 20' Commercial

Post by MSRiver » Wed Jun 06, 2018 7:13 pm

After some further investigation looking inside from the now battery box and sanding some areas to see if i could find a seam of fiberglass it is all one piece. Looking down the inside there wasn't anything i could see that is holding the cap and sides down, i believe where the floor starts must be epoxied to the stringers or something similar cause those spots seem to be more sturdy. If so when cutting what would be the best bet to be able to glass the cap and sites back to the floor? Picture below.

Image

OrangeQuest

Re: 1981 Dolphin 20' Commercial

Post by OrangeQuest » Wed Jun 06, 2018 7:36 pm

Jaysen wrote:
Wed Jun 06, 2018 7:08 pm
Sell him on the SOB tool. I’m surprised I’m the one bringing it up.
This could be your best tool for probing around.

3090

Can always glue things back together.

Jaysen
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Re: 1981 Dolphin 20' Commercial

Post by Jaysen » Wed Jun 06, 2018 7:39 pm

Those SOB tools are ... SOBs

Grrrr

fallguy1000
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Re: 1981 Dolphin 20' Commercial

Post by fallguy1000 » Wed Jun 06, 2018 9:20 pm

I use the HF every day. Today I cut the excess glass of the beaching keel before it came out of the mold.

Step it up with carbide blades.
My boat build is here -------->

viewtopic.php?f=12&t=62495

fallguy1000
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Re: 1981 Dolphin 20' Commercial

Post by fallguy1000 » Wed Jun 06, 2018 9:38 pm

I have a few general comments.

First, make sure you know what the hull is made of before you progress at all.

If the hull has a core, like balsa core, you want to make sure the core is not rotten. A rotten core in a boat such as this renders the project nearly useless, imo.

Second, before cutting away the sole/floor, take a few pictures of it and submit them here.

Oftentimes, leaving a portion of the sole intact on the edges will make repairs easier. Sometimes the sole is tabbed into the sides and if so, leaving a small piece of the old sole will provide a place to make a tab for the repair. Removing it fully makes it a pita to fix.

Otherwise, submit a lot of pictures to the forum; it'll pay off.
My boat build is here -------->

viewtopic.php?f=12&t=62495

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cape man
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Re: 1981 Dolphin 20' Commercial

Post by cape man » Thu Jun 07, 2018 7:12 am

I would contact Dolphin. They should be happy to help get a 1981 boat back in service.

I fished out of a friend's Dolphin several times in 1978 in the Everglades. Nice boat!
The world always seems brighter when you've just made something that wasn't there before - Neil Gaiman

IpswichGrady
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Re: 1981 Dolphin 20' Commercial

Post by IpswichGrady » Thu Jun 07, 2018 8:36 am

OrangeQuest wrote:
Wed Jun 06, 2018 7:36 pm
This could be your best tool for probing around.
3090
I have this exact tool and have used it a ton with my transom and other area repairs that I needed to cut out. One thing I found is that the HF cutting blades are not the same quality as a more name brand blade.

MSRiver
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Re: 1981 Dolphin 20' Commercial

Post by MSRiver » Thu Jun 07, 2018 12:19 pm

Im going to try and give dolphin a call today to see if they can lend some advice at all. From the picture where all the wires come through the hull. i probed around in there. One thing i found is all the plywood is gone, as if that wasnt a given, but what seems to be supporting the deck or what it sits on seem to be 2 huge stringers or a false floor on either side of the gas tank compartment. Seems as if there is some foam in there but not filled all the way up. They are made with heavy duty fiberglass. Heres a cross section of what it looks like. You can also look back at the other picture that looks on the inside running down the sides. You can see that the cap/mold floor sits on these. The floor is not directly attach to these for the majority, but seems like they are attached on the outer edges.

Image

fallguy1000
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Re: 1981 Dolphin 20' Commercial

Post by fallguy1000 » Thu Jun 07, 2018 3:35 pm

A lot of times the sides meet the sole and no stringer under. If so, leaving a tab or the tab of sole about an inch allows for you to glue a tab under, but if you have a stringer there; no need.
My boat build is here -------->

viewtopic.php?f=12&t=62495

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