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'46 Runabout 25 Feb 2023 02:25 #124586

I'd love to sink this boat in a vat of WD-40.

 

 

 

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'46 Runabout 16 Feb 2023 23:20 #124503

I decided to take another look at the bottom where the punctures are. There is corrosion filled with fiberglass resin. Something was left laying on the hull for many years. I built a cradle to hold the boat.
 

Nat helped me lift it up and surprise, it worked even though I had just eyeballed the fitment.
 

Looks like a good portion needs replaced.
 

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'46 Runabout 06 Feb 2023 15:05 #124370

The Meteor I am working on had two stringers that were attached by widespread rivets that were installed in oversized holes. Previous owners had used a tar like substance along the edges of these stringers I'm assuming to try to stop leaks. The sheeting under these two stringers was corroded. The other two stringers were attached with closely spaced rivets in correctly sized holes. There was no corrosion under those stringers. All of these stringers were fabricated from two formed "C" channels riveted together to form an "I" beam. This "I" beam has a channel where water can flow in and out at the ends under the stringers but the ones that were corroded underneath also had the tar along the edges and ended closer to the transom and they both had cracks in the sheeting under them so water had an easy path in (and I'm assuming out) so they may have held more water under them. Charlie has access to a Metallurgist at the Aluminum rolling plant where he works, he asked his opinion on coating the corroded sheeting with something before attaching the new stringers and he recommended just thoroughly cleaning the sheeting and assembling without a coating. I am still considering using a zinc primer on the corroded part of the sheet under the stringer. And yes, even fresh water trapped between Aluminum sheets can induce corrosion.  

“Keep thy shop and thy shop will keep thee”
- Poor Richard’s Almanack, 1737

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Last edit: by Locomotion.

'46 Runabout 06 Feb 2023 13:45 #124367

Here's corrosion between the back seat flange and the hull.
I plan to use anti-oxidant on it when putting it back.
 

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'46 Runabout 06 Feb 2023 05:06 #124361

I don't know anything about corrosion between like metals but I could see a possible problem with water trapped between two pieces of aluminum for extended periods of time.
John

1958 Vagabond II & 35 HP Evinrude
1955 PlastiCraft 12 Ft. Delux Runabout
1957 Clipper & twin 35 HP Evinrudes
1957 AlumaCraft 14 Ft. FD
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'46 Runabout 06 Feb 2023 01:27 #124351

Does aluminum corrode in fresh water ?  I can see a problem if salt water gets between them but would that hold true if only fresh water may intrude ?  I know aluminum oxidies in air.  Is that the concern, John ?

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'46 Runabout 05 Feb 2023 13:16 #124348

That's a very good question John.
I guess there are a few different ways to address it.
Treat both layers with zinc chromate, apply an anti-oxidant, or use one of the various marine sealants.
For now, I have hit the pause button. That happens every time I think of drilling holes in an FC.
What's best for the boat.
 
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'46 Runabout 04 Feb 2023 16:50 #124335

Terry,
Are you at all concerned about water collecting between your patches and the original hull resulting in serious corrosion?
John

1958 Vagabond II & 35 HP Evinrude
1955 PlastiCraft 12 Ft. Delux Runabout
1957 Clipper & twin 35 HP Evinrudes
1957 AlumaCraft 14 Ft. FD

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'46 Runabout 04 Feb 2023 01:26 #124322

Twenty degrees and twenty mph winds, I had to run the electric heater and the gas heater to make the garage tolerable. Usually the electric knocks the chill off.
I copied the stringer rivet spacing and did a layout. Center punched and pre-drilled, 36 rivets each panel.
 

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'46 Runabout 03 Feb 2023 21:11 #124316

Terry, Sorry for the slip on the name, I’ve done that before, I’m claiming clutch slippage. ;-)
“Keep thy shop and thy shop will keep thee”
- Poor Richard’s Almanack, 1737

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