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Sabtu, 07 Januari 2017

Eastern Arctic Kayak Reconstruction sort of

I have started the construction of an Eastern Arctic Kayak based more or less on the information provided by Dr. David Zimmerly in various articles.  Zimmerlys own reconstruction is, as he states in his article in Sea Kayaker Magazine, a composite of various designs.
My own construction is in turn a variation on Zimmerlys interpretation. 
Major deviation for me is that I did not want a 22 foot kayak and so shot for something more like 17 feet long and lighter in weight,  hoping to keep is under 50 pounds rather than ending up with a 65 pounder.
Step one is the fabrication of the gunwales which for the Eastern Arctic Kayak are a good deal more complex than two straight boards I normally use for building Unangan style kayaks.
Whereas Zimmerly built his gunwales from two lengths of 3/4 by 5-1/2 boards scarfed together, I started with a 16 foot two by four that I ripped down the middle giving me something like two 5/8 x 3-1/2 x 16 boards which I then built up to approximate the Zimmerly design.  Lots of clamps and Gorilla glue in use. I used Gorilla glue rather than epoxy because Gorilla sets up faster and is easier to clean up than epoxy and less hard on tools.

Here the nose piece goes on.  The design I am copying has the gunwales more or less flat up to the front of the cockpit, then rising from there forward.

After the glue has dried, I faired the lumps out of the top of the gunwales resulting in something like the above.

Here I am using a spline to draw the part of the bottom of the gunwales that I intend to remove.

And heres the whole thing with the top faired and the bottom scooped out.  The gunwales are made to rise amidships because normally, when you bend them, the middle drops down.  The rise counteracts that drop to give you a more or less flat deck.

And some additional rise at the bow to help the bow stay out of the waves.

And thats how it looks faired and trimmed.

And finally, the long view.


I am thinking I probably overdid the midship rise in the gunwales by at least an inch, but Ill stay with it since it doesnt affect the bottom of the hull at all.  Sometimes it is good to go with ones mistakes just to see how much harm they do to the proper functioning of the boat.  After that you can speak with authority on why the way you did it was not a good idea.  Still, you have to admit that what I ended up with looks pretty cool.  And by the way, when you do gunwales that are 3-1/2 inches deep, you dont need fancy lumber since small knots dont affect the structural integrity of the end product by much.
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Minggu, 29 Mei 2016

The Yurt Gets a Door and other improvements

The sixteen foot yurt has lived for over a year without a door.  But now that it has a stove, I discovered that the yurt loses heat quickly without a door.  Actually, I already knew that, but since my improvements on the yurt tend to be on a just in time basis, having a source of heat made a door imperative.  The first stab at a door was to just staple some pieces of vinyl banner to the door frame, but in a wind they were practically useless.  So the next step was to build a door with a wooden frame, something more substantial that would actually keep the drafts out.
The stove, blazing away.
The stove pipe now has a hat which keeps the rain out of the pipe but the smoke hole needs some flashing around the pipe so the tarp that covers the hole in the rain doesnt get melted by the heat from the stove pipe.
One of my neighbors at the shop has donated a chair, a mockup for the console/chair for the boat he is building.
And here is the new door, a wooden frame with a piece of plastic banner stapled to the front of it.
And here is a view of the door from the outside. Love that shanty-town look.
Closeup on the latch mechanism. The string goes through a hole on the top and another on the bottom.  When outside the door, you pull the top string to pull up the latch or the bottom string to pull the latch down. 
By the way, the yurt has now withstood 65 mile an hour winds and survived.  Little by little, small improvements make it a better structure.  Surprisingly, the most challenging task was how to keep the roof in place since wind going over the top of the roof creates a vacuum which wants to lift the roof cover up and then blow it off.  An improved tiedown system did the job.
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