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A Raven from Scratch

Thanks Brian. Your explanation makes sense & I welcome the suggestions... it's how we learn (unless we insist on making every dumb mistake on our own- I sometimes do that lol)

Given the extra width of this seat (my last was about 6 inches narrower) and the fact that this one's maiden voyage may be 3 weeks solo outside of Wabakimi, I'm wondering if I should make another or perform some kind or real-world testing (It won't be easy to replace once it's epoxied into place).

You are correct, the cross pieces are 7 plies (alternating stack of 4 Sassafras & 3 White Oak while the spreaders are 3 plies Sassafras top & bottom w' White Oak in the center) If I dado on the side, should I increase the thickness to 5 plies? I won't be drilling any of the seat pieces, I wrap the paracord around so as to provide an extra layer of security. In the event of breakage, the wrapped paracord will (theoretically) prevent catastrophic failure. (here's the last one)

IMG_20230812_201226044.jpg

I also need to find a better way to clamp the seat pieces in order to keep them all on plane. I've got a slight twist that, while not a deal-breaker, it would probably be easier to fit the seat without the deviation.

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(the other 3 pieces of the cross-rails are sitting on the hull)

Also, speaking of suggestions: I spent a few hours in the boat shop today and got the inside sanded sufficiently. I used the half-round files and then went over the whole thing with an orbital and 40 grit. One word of caution to anyone considering Tamarac: The same splintering properties that caused me to discard 1/3(+/-) of the strips during beading & coving came into play when sanding.

When the staples came thru, many of the strips developed splinters which I found everytime any bare skin was exposed alongside of the file and, frequently, while feeling the hull for smoothness. There were a few places where the strips were badly misaligned and I found that taking a Surform shaver across them at an angle seemed to quickly take the edges off.

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I made it about 3/4 of the way around the hull when I got tired of bleeding and I grabbed the orbital, slapped on a 40 grit pad and gave the whole entire hull a once-over.

DSCN3600.JPG

Now the "suggestions" part... there was one place that I'd had to piece in a small section of Sassafras when closing the football. That small piece was proud on the outside & was, therefore, sanded flush with the longboard. This, of course, means that it is recessed on the interior and I'm undecided as to what to do.

DSCN3601.JPG

I have some Sassafras shavings from making the paddles and I could glue / epoxy some of them into the low spot and then sand it flush. At this point, however, I'm thinking I could use a scrap or two from the outside, lay it in the hollow & glass over it like this.

DSCN3602.JPG

the extra material should provide adequate strength and I doubt that it would be visible. (there will be 2 layers of 4 oz e-glass over this area regardless of how I fill the void)

Your thoughts?
 
I would probably just fill that void with thickened epoxy, that's probably the easiest way to get it flush.
Concur with Mem, thickened epoxy slightly proud, then use a flat scraper to get it flush, tint it with the copious amounts of wood dust you are currently producing (lol).

If you want it to colour match, use cabosil (fumed silica) and wood dust in about a 10:1 ratio
 
Personally, with all the stuff you need to get done, I would be inclined to suspend that seat and bounce in it a bit, if holds, it holds ,,, if it creaks or cracks, you know it is something you need to do ... otherwise you have lots to keep you busy. Maybe figure a way to "fasten" instead epoxy it in place, that would make your life a lit easier when it needs work.

When I do seat glue ups, I like to turn it upside down and clamp the corners, but generally it lays flat, the skew may be that top dado.

As far as the seat spacers (for/aft stringers), I don't usually make a lamination for those, they don't bear the same weight and unless it is a fashion thing, where you want all seat panels to match, I don't think it really is required. I like to make a full thickness piece (fill the ado) shape the extra bits away, cut an arch to save a little weight and call it a day. We are essentially making the same seats, there are lots of pics in the last build thread I did on seats, you may get an idea there : https://www.canoetripping.net/threads/light-weight-solo-tripper-build.105054/post-111763
 
I'll grab 100# of feed and flop down on it like I got fat(ter) and lost my balance. I just hope I don't take a couple of plies in the posterior if it fails. :rolleyes:

Either way, I'll probably dado it your way next time as that would also make it easier to arch the stringers like Jim has been doing. Looks pretty comfy.
 
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