Aluminum Barrelback

Steel and aluminum boatbuilding. See: "Boatbuilding Methods", in left-hand column of the Home page, for information about alloys.

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Aluminum Barrelback

Postby whsoxfan » Tue Nov 14, 2017 1:30 pm

Hello Fellas

anyone ever attempt building a metal barrelback with rivets?

Any pics?

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Re: Aluminum Barrelback

Postby steveh41 » Tue Nov 14, 2017 4:02 pm

Here's a vintage aluminum runabout... sort of the same idea. Adapting the Barrelback plans to aluminum would be a project in itself but would make up into a really unique build.

aluminum runabout.jpg

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Re: Aluminum Barrelback

Postby JimmY » Tue Nov 14, 2017 8:00 pm

They clean up pretty well too...

Nothing says poor craftsmanship like wrinkles in your duct tape!

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Re: Aluminum Barrelback

Postby Roberta » Wed Nov 15, 2017 6:35 am

Might be kinda cool!! Maybe anodize the AL in different colors for an interesting effect.

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Kevin Morin
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Re: Aluminum Barrelback

Postby Kevin Morin » Fri Nov 17, 2017 10:55 pm

Using the pics as a jumping off point- there are lots of shape related issues to overcome in a one-off, home build of this hull in aluminum. First is the fixturing- to get sheets into this shape, especially the topsides with their radical 'roll' or twist from flam to tumblehome (!) would be an expensive investment in time.

The shape of the topsides' bow would not be unique by itself, nor does is present a challenge- however combined with the gorgeous tumblehome in the after 1/3 fo the hull- this implies some from of collapsible fixturing- either end is simple by itself but when combined - how would you removed the hull of the fixture that held framing/sheathing in place? Not impossible but then, a complex fixture I suspect was justified by the manufacture of the hull shown?

Next main one off challenge would be doing the various components shown- as they are shown- the edges of most panels shown- almost all transverse sections are flanged or edge beaded and that implies a -non-marine alloy (meaning not 5000 or 6000 series alloy) so the material could be formed/ shrunk and stretched adequately to create the transom/bulkhead/dashboard/other transverse panels with their built in stiffeners and rounded flanged perimeters used to rivet the thin skin too.

Last, and not the least challenge is the design of the chine- not shown in detail in the photos- as this would seem to be a formed section that holds rivets for the topsides and the bottom panels. This piece would need to have a changing cross section- in the stern the angle between topsides and bottom may be nearly 90deg- however at the bow- depending on the chines' rise in profile view(?) the chine rivet strip will be nearly flattened?

Taken together, this beautiful example of the barrel back run-a-bout in aluminum would sure be a challenge to build one-off.

If, as steveh41 mentions, this boat were converted to aluminum - it looks to me that it would be easier to build in welded metal- but that would still be a challenging project for even someone with lots of experience in welded aluminum skiffs.

Pretty skiff, evokes Carlos Riva's lines for the Florida, but smaller and with more pronounced tumble home.

Kevin Morin
Kenai, AK
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