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Kamis, 10 Maret 2016

Those Troublesome Skegs Part the First

When we built punk rafts and floated several big rivers, we powered the rafts with canoe paddles and our own arms.  Though the big innertubes that floated the rafts provided so much flotation, they drew no more than a few inches of water, it was still like pushing a truck.  After a long day of avoiding Swirlies (eddies) and River Sharks (snags), we were exhausted.


Since the raft had no keel or centerboard, it had nothing to provide lateral stability.  So when we were going forward, we had to synchronize our rowing or else wed be zigging and zagging all over the water, which we did plenty of anyway.


As an aside, having no keel did have one advantage:  We could rotate on a dime. So for example, avoiding an object in the water dead ahead, the Caller might call, "Okay, give me one easy backward stroke," while paddling forward herself to pivot the raft toward the hazard.  Then shed call, "Okay, now give me three strong backward strokes," to put the raft out of the way of the snag. Facing the hazard forward thusly, we could always push off if we hadnt rowed fast or strong enough.

In short, it was a big pain.  And exhausting if we had to row any distance, for instance in still water.


The plans for the shantyboat have long skegs (sorta like double keels) that run the length of the bottom of the hull. This gives the boat lateral stability when it is powered and keeps it from skipping all over the water when the boat is turned.

While it really didnt seem like a big deal to make and install the skegs on the finished hull, it turned out to be a bit of a long process.  Heres why:
  1. The skegs had to be made out of a rot resistant wood that turned out to be hard to find in the lengths I needed.
  2. I ended up having to splice board together to make adequate lengths.
  3. They had to be bolted through the beautiful hull Id just finished making watertight, and I was scared.
  4. I screwed up several times and had to redo stuff.
  5. I had inadequate tools for some of this work.
It sounds like Im making excuses, but it feels more like:  "Haha, look how dumb I am, yet I still got it done."


The plans called for any of a variety of woods, none of which the local lumber yard had in anything approaching the lengths I needed.  White Oak, Yellow Cedar, Port Orford Cedar, a few other ones that are found on the East Coast. Ideally, I was looking for 16 foot lengths. But these are increasingly rare hardwoods that simply dont come in those lengths.

I found a specialty hardwood vendor only a half hour away. They had the Port Orford Cedar and what they called Alaskan Yellow Cedar. Neither of these are actually cedar, but are cypress. For you botany nerds, Port Orford cedar is officially known as Lawson cedar or Chamaecyparis lawsoniana. Alaskan yellow cedar is Cupressus nootkatensis.


Of those, the longest they had was 14 foot lengths. A conversation with the hardwood dealer goes like this:
"Can you get either of these trees in sixteen foot lengths?"

"We get what we get."

"I mean do you ever get 16 foot lengths? Can you order that length?"

"We get what they bring us."
O-kay.  That didnt sound too hopeful.  I knew if I had to, I could splice a longer length together.  There was lots of frantic maths at the lumberyard trying to see what lengths gave me the most efficient use of wood.  While still expensive, the Port Orford cedar was half the price of yellow cedar, so that decided it.


This was expensive wood, so I wanted to make sure I got the best use out of it. I had to use the cedar for the bottom skegs, the fore skegs, the trim boards along the bottom side, and the edge boards all around the top edge. So I created a cut plan so that every bit of the wood was put to use.


Then I spent days cutting and ripping and making lots of sawdust, sure that every cut I made was going to render this expensive piece of wood unusable.

Next well talk about the splice that turned four shorter pieces of wood into two long 16 foot skegs.

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Rabu, 10 Februari 2016

First Build Day Building Form

After months of hemming and hawing over plans and possibilities and uncertainties and even driving to the Middle of Nowhere to get a trailer, finally we start building the boat.  Or at least we build something that is essential for building the boat.


The Glen-L plans call for making a building form upon which to build the boat.  With the building form you get the boat at a height you can work on it, as well as have a level, plum, and square form upon which to assemble the individual pieces.


From these photos you also get an idea of just how beautiful a location we have to build the Shantyboat  Thanks to Lawrence and his family for their generosity, and perhaps their healthy curiosity as they watch the project slowly come together from a pile of lumber to a boat.


I actually found an error on Glen-Ls otherwise flawless building plans.  The plans called for the cross spalls to be 97", which is one inch over 8 (a frustrating waste of conventional length lumber).  Another measurement in an end view gave half the measurement of the cross spall as 3-11 1/2", or 95 inches. As usual after a little back and forth clarification, I got a message from Gayle:
Wes,

I had Glen take a look at the plans and heres his
response:

Seems to be an error. The cross palls should
extend 3 11-1/2" each side of CL or 95" long. You
have thickness of side planking, plus FG plus rub
rail to obtain beam of 8 2". This will make an 8
width on the bottom to match the two 4 wide PW
panels.

Gayle Brantuk

This building form was mostly made of scrap lumber.  The stringers (the frames of the boat that run longitudinally) will sit on top of and perpendicular to these cross spalls on top of the building form. 


I actually built the form wrong, at least according to the plans (the side pieces are reversed inside out).  And though it didnt hurt anything, it set me off on a cascade of self-recrimination at my carelessness.  If I assembled the boat with as little attention to detail, I would be wasting material, causing undue frustration, and making an ugly boat.

This made me rethink ways I could balance my eagerness with my sense of precision.  The next week I switched gears from my cavalier construction of the building form to a slower more careful approach.

Jen and Kai both helped me make the building form.  And after Kai and I had a pretty pointless conflict, I realized one very important boatbuilding need that I hadnt taken into account for people working hard in the hot sun all day:  Snacks!
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