1990 Seanymph 16ft sportfisher Complete rebuild

[SickVoodoo]

I purchased this boat last fall and noticed lots of floor movement when I was ten miles away from port on lake erie. Further inspection showed a old repair to the left side of the axle on the trailer. It looked like someone hit something with that tire and bent the axle. I then started to tear into the boat and noticed most of the left sides ribs cracked, stringer separated from ribs, and most rivets loose of gone. I just completed tear down tonight and am still contemplating scraping the project. What do you guys think?

 

[jbcurt00]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

You own it, do YOU want to fix it?

Welcome to iboats dry dock, tin division

Lots of tin boat building here @iboats dry dock.

Get the rest of the foam & etc out of the hull ('cleaned' aluminum will get a higher scrap price anyway) and take LOTS of pix, esp of any further damage. Several are currently working on severally damaged tin hulls, get the demo done & get some pix up. They'll be along soon enough to help out.

Fishing big water makes the decision & repair methods even more important, IMO.

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I will take some more detailed pictures tonight. I currently have all the foam removed. The next step is the quarter car wash. As for repair techniques I plan on welding all the cracks possibly platting some of the key areas and re riviting the whole interior structure with aluminum monobolts. I like the monobolts because of the added streangth.

 

[jasoutside]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

Looking forward to seeing the extra photos hereopcorn:

Welcome to iboats!:welcome:

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

 

[glnbnz]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I say rebuild her...one of the good things about tinnies (I know I know...like I would know lol) I guess is that you can work on it anytime. You don't have to wait until the weather gets better or anything like that!!

I looks like you have a good start going on there!!

 

[jasoutside]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I say rebuild her...

Agreed! I don't see anything that can't be fixed there:encouragement:

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

It was more the cost and time to repair it. With the full interior the hull repair is the easy part. I have everything welded up and installing the first new monobolts in now. I will post pics later tonight.

 

[jigngrub]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

The beauty of restoring an old boat is that you get a like new boat for a fraction of the cost of a brand new boat when you're done.

... and you also get to design/build it the way you want it.

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

A sample of the many welds on the ribs. This was my first time welding with this spool gun for my miller 211 and I am very happy with how it welds. I also only had it plugged into 110v. Should be even better with 220v and new clean aluminum.

 

[glnbnz]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

It has been a long time since I did any welding, and when I did it was steel. But those look good to me

 

[jbcurt00]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

Although welded, and the welds look pretty good (I'm not a welder, nor did I stay at a Holiday Inn Express last night) I'd be inclined to fab & install some additional continuous aluminum 'patches' over the welded ribs to carry any load/stress across the repaired area. Aluminum is fairly easy to work harden, particularly when welded. Could lead to cracking along areas near or besides the welds.

Any indication from the seller or boat's condition as to what caused the ribs to crack along the keel & at the end of the stringers that were clipped to install a belly tank?

Perhaps a previous owner changed the below deck layout to accommodate the addition of the tank? Maybe?

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I was also thinking about running some three inch long strips to help spread the load across the repair. I think the fuel tank is original and the damage was caused by the trailer bunk when the axle was bent. Unfortunately I purchased the boat from a coworkers father in law who has since passed away.

 

[jigngrub]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

The welds look good to me.

What kind of plans do you have for floatation foam, decking, and deck finish?

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I am going to purchase pour in foam but debating what kind. It comes in 2lb psft or 4lb psft. For the decking I was going to go to manards and get marine grade treated plywood. I am planning on using a vynal flooring like the link bellow. The only carpet I will be putting back in is around the consoles.
http://www.************/product/Dor...o=0&destination=/category/Vinyl/104672880.uts

 

[jigngrub]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

The 4 lb. density foam is more water resistant than the 2 lb.

If you use treated plywood make sure it's CCA pressure treated and not ASQ formula, the ASQ is highly corrosive to aluminum. You can save some money and use MDO plywood instead and it's really good stuff and is used in marine applications.

Your link for the vinyl didn't work, but the URL you posted looks like you intend to use the Dorsett brand which is good stuff. You may want to compare prices to the Nautolex vinyl sold here:
Tried to post the url to Defender but it didn't go through, just google Defender Marine or Nautolex vinyl and it should come up on the search engine. It's the cheapest place I could find to buy it online and they have great service too.

I used the Nautolex in my boat and love it:
http://forums.iboats.com/boat-resto...ir/97-tracker-pro-deep-v-facelift-509163.html

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I checked out your boat build and that flooring looks very similar to what I am looking at. How well dose the mdo plywood hold up to moisture? I was told that manards has the proper treated plywood that gets along with aluminum.

 

[jasoutside]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I checked out your boat build and that flooring looks very similar to what I am looking at. How well dose the mdo plywood hold up to moisture? I was told that manards has the proper treated plywood that gets along with aluminum.

MDO is good stuff but you still really should seal it up.

Menards is great but as far as I can tell their treated stuff eats alum just like all the other treated ply.

Cheers!

 

[jigngrub]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild

I checked out your boat build and that flooring looks very similar to what I am looking at. How well dose the mdo plywood hold up to moisture? I was told that manards has the proper treated plywood that gets along with aluminum.

If Meynards has the CCA plywood it'll be between $80-$100 a sheet for 3/4" and it will have the words Chromated Copper Arsenate and Kiln Dried stamped on the back.

Moisture resistance is what MDO plywood is all about, it's used for making outdoor signs and we use it on the construction site to form up concrete walls because it's very strong and the water in the concrete doesn't penetrate it. The overlay face is very smooth, slick, and shiny and makes for a really good looking deck with vinyl on it. You can read about it here:
Medium density overlay panel - Wikipedia, the free encyclopedia

... and here:
http://bluelinxco.com/Portals/0/docs/LiteratureLibrary/Structural Panels/APA HDO and MDO Plywood.pdf

 

[SickVoodoo]

Re: 1990 Seanymph 16ft sportfisher Complete rebuild