Building a 25' Ply on Frame Cabin Cruiser #8: Finished scarf joints and work with the keelson

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Blog entry by AlTriolo posted 05-10-2017 10:34 PM 3015 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 7: Scarfing Chine Logs & Sheer Clamps Part 8 of Building a 25' Ply on Frame Cabin Cruiser series Part 9: Progress! Keelson, Stem, and Transom »

I finished all my scarf joints. They say this thickened epoxy is supposed to be hard to sand. Tell that to the belt sander with an 80 grit belt! It was no match.

Here’s an example…they weren’t all this bad. :-)


And just as everyplace in the house is a boat staging area, everything around gets to be a tool.

And here are the four 30’ boards side by side.

I installed tracks at my 20” marks to help get the frames square with the keelson. These will be removed later. The keelson is 25’ and I need all but about 9” of it!

I had tried to square everything with 1×2 strips but that did not work! The boards were so warped that everything was terribly out of line. That was before the keelson and tracks. So, to work with the keelson, I cut 18.5” spacers and used them to space the frames. Bingo! Like a charm!

2 comments so far

View English's profile


692 posts in 2632 days

#1 posted 05-10-2017 11:47 PM


The scarfed boards look straight. I had a lot of problems when I put on my chine and sheers on with keeping the boat straight. I had to go back and use a clamp to pull the boat straight has I was installing the side planking. So your braces are a good idea, but keep a eye on the frame. It would be a lot easier to fix before the epoxy goes on the chine and sheer.

That’s going to be one big boat!!

-- John, Suffolk Virgina

View AlTriolo's profile


28 posts in 1722 days

#2 posted 05-11-2017 12:07 AM

Hi John,

The plan is to finish screwing the keelson in place then adding the c/l and s/c without expect. Once I confirm that everything is in line, I’ll back them out and epoxy them in one at a time.

I really couldn’t believe how well the keelson tracks and spacers worked. Even without rotating the frames at all, the were lining up so much better than with the 1×2s.

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