Old Kayak Bent Ribs Buckliballs

 

In my previous post, I described how one of my kayaks spontaneously changed shape in response to a shrinking skin.  While this type of response would generally have been regarded as mechanical failure, researchers are now trying to steer this kind of phenomenon to make it perform useful tasks, that is by creating a variable shape that can adapt to conditions.

Buckliball changing from large to small (left to right) in response to external stress

Paraphrasing here - One stress makes you larger, one stress makes you small, and the stress that mother gives you dont do anything at all. Never mind.  Pause for groans to subside.

geodesic dome assembly

By the way, if you didnt grow up in the sixties, which is likely, you probably missed Buckminster Fuller and his geodesic domes and also buckyballs which he invented and which I suppose buckliballs is a pun on.

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Unangan Aleut Kayak Terminology

Unangan kayak terminology has been set down in an article written by Knut Bergsland, Norwegian linguist, now dead, in Contributions to Kayak Studies, Eugene Arima, editor. I think thats the most commas Ive ever put in a sentence.
Ive been wanting to do an illustrated version of that article for some time, but what has discouraged me is the messy nature of the information in Bergslands article.  The information is messy because there was never just one official way of naming kayak parts in the Aleutians.  For one thing, Unangam Tunuu, the Aleut language had multiple dialects, at one time, probably as many dialects as there were tribal groups, something like nine, possibly more.  Along came the Russians, consolidated settlements and moved people around and a number of dialects disappeared.  The documented dialects remaining were the Eastern Aleut, the Atkan and the Attuan dialects. Then during WWII, the Japanese invaded Attu and moved the Aleut community there to Japan while the US moved the remaining Aleut population to the Alaskan mainland.  After WWII, Aleuts were repatriated, Attuans moved to Atka and so the only two dialects that were still alive were the Atkan and the Eastern Aleut. 
So when Bergsland collected his list of kayak terminology, he had some historical sources available that documented Attuan terms and speakers of both the Atkan and Eastern Aleut dialects. Not surprisingly, documented Attuan terms are fewer in number than for the other two remaining dialects at the time that Bergsland did his compilation. 
And terminology varied over time so that some kayak part may have been called one thing in the 19th century and then something else in the 20th.  Keeping all of this straight is not an easy thing. 
On top of that, we have to deal with Bergslands dense and sometimes cryptic writing style.  I give one example here.
"On top of the taamx^aax^, on the right side in front of the hatch, there was a hook for holding the paddle when not used, made of wood or baleen, or sometimes ivory (Atka 1952), possibly in the shape of a sea otter (Jochelson 1952:131), called in western EA (1909, 1950) x^aach(a)g^iilux^, in AA (1840, 1952) haachachag^iilux^, derived with the suffixes -g^i- + -alug^- place for having - from the above-mentioned term for paddle, EA (1778-) x^aasi-x, AA Au hassi-x."  inhale.  and so on he goes.  So you rub your eyes, go back to the start of the paragraph, try to match up the English with the Aleut term the two of which are invariably separated by a string of parenthetical phrases and hope you dont miss the period that lets you know that you have finally arrived at the end of the sentence.  By the way, the AA, Au and EA sprinkeled liberally around the sentence are abbreviations for the dialects respectively, Atkan Aleut, Attuan Aleut and Eastern Aleut. 
You get the idea.  I thought it might be nice to have a version of this that puts the Aleut term right with a picture of what it is referring to. 
I might put the pictures and words in this blog if I can make that work, the problem being that the blog software controls the size of the pictures, (small) and the layout of the text. Stay tuned.

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The Americas Cup

The Americas cup is one of those sailboat races that has been going on for a long time and happens again and again at various intervals.  Seeing as it involves large sailboats, only the very rich can compete, albeit with hired crews.  This year the race or part of the race is happening in San Francisco Bay on which I live and so the news about it reaches me.  I have nothing to offer on the merits of the race but it did happen that the Swedish race team is working out of an aircraft hangar close to my own modest boat shop and so on the way to work or going home from it, I see the boats that compete in the event.  So I want to offer some photos of the Swedish boats because I find the boats interesting.
By the way, I understand that the current crop of boats are a short version of what will be in the final competition.  And all the boats were built in New Zealand by the same builder to the same specs so that he race is about who has the best crew and not about who has the best boat.

 This is one of the two Swedish boats tied off to a buoy in the Seaplane Lagoon.  In the background, one of the maintenance hangars from the Naval Air Station days.

 The boats and the sails are moved in and out of the water by a crane.  They are not that heavy as boats go, around 3000 pounds. 

 Here is the boat itself, without its rig.  Dagger boards are in their retracted position.

 And the Americas Cup logo and Swedish flag.

 The boat has a wing and a jib.  The wing is symmetrical about the center plane unlike an airplane wing which is usually flatter on its bottom face.  

 And there are the Swedes, out on the bay doing their stuff with their support boats motoring behind them.

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Old Kayak Bent Ribs

Ive got one more set of photos on deck for the old kayak series.  Not that I dont have more old kayaks or old kayak photos, but its a matter of being able to find them.

Todays tale of woe is all about the lethal combination of heavy nylon fabric and a boat left out in the sun for too long.  Nylon, if you dont already know, contracts with high temps and as you can see in the photos, pushes down on the keelson and bends the ribs into a reverse curve.  This isnt that bad, mostly it makes the hull a little flatter.  What is worse is the end to end shrinkage of the fabric which compresses the keelson which responds by taking on something of an S curve when viewed from above.  This makes the boat pull to one side.  But even that is not lethal and I managed to fix it with a rudder.  Its just that the boat is not the elegant craft that you started out with. So beware of heavy nylon combined with heavy sun.

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Old Boat Reverse Sheer

I know what youre thinking. That boat was warped on account of that concrete pillar coming out of the cockpit. But not so. The concrete pillar coming out of the cockpit is an accident of framing.  I could tell when I was taking the picture that maybe my framing was not that good, but I was not in the mood to reposition the boat just for a picture.
Anyway, what I am trying to show here, and it may be more obvious if you click on the photo to see a larger version of it, is that the sheer line has gone into reverse, that is, the sheer is higher in the middle than at the ends. And the bottom of the boat has flattened out to the point of almost no rocker. 
The sheer line for the non-nautical is the line made by the tops of the gunwales, that is, the two boards that form the edge of the deck.
This was not a boat I built, but I am sure that when it was built, it had more sheer and rocker and that the downward movement of the bow and stern with respect to the middle of the boat was the result of the nylon skin tightening up over time. 
The other thing I noticed when I build boats is that since both the keelson and the stringers are bent into place over the ribs, they exert a downward force on the ends of the kayak that combined with the force of a shrinking skin will tend to make the keel line of a skin on frame boat more straight over time.
I am theorizing here, but the Unangan (Aleut) builders always built their keelsons in two or three parts and the parts were carved into a curved shape, not bent into place to avoid this kind of downward pressure on the ends of the boat. 

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This Old Kayak Old Paint Part 1

People occasionally write me to ask whether they can use this or that material or process in the building of their boat.  I sometimes have answers for them and more often do not.  When I dont, I like to tell them to try whatever it is they are asking about and they will find out if it works or not and then they will be the experts on that particular topic.
In any case, I try a lot of stuff, more or less indifferent that a lot of it wont work.  I also am casual about boat storage so most of my boats are subject to accelerated aging. I also like to use off the shelf, not yacht approved materials to see whether there is a cheap way out of any particular conundrum.
So lets move on to todays topic, Old Paint. No not the horse.  Old paint that has turned dry and brittle and stressed and developed cracks.  To be more specific, old varnish.  Because the substrate of the varnish on a skin on frame boat is a flexible fabric, impact on the skin causes fractures in an interesting way. So proceed and feast your eyes on a variety of stress cracks in old varnish on a nylon skin.  Enjoy.

A small running critter.  The green flecks are fake gold leaf I put in the varnish.  The gold is actually brass and has oxidized to a green.

stretch marks.

Southwestern US petroglyph, what of, Im not sure.

and a braid.

More stretch marks.

This one kind of looks like an ancient shrimp fossil.

This one, Im not sure, kind of like a cartoon bird in flight.

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Old Kayak Old Paint Part 2

For the premise of this post, go back one post.  This post is about yet another instance of a paint job gone wrong.  Not functionally wrong, just esthetically wrong, though not entirely, not in my estimation anyway.

 I took these pictures just before repainting the hull of my favorite Unangan kayak, (baidarka).  The reason I was repainting was not that the finish looked spotty. I actually liked the look, sort of organic, but rather that there was wear in the base coat that was letting water leak in.

The original sealer on this boat was varnish which gives the boat a vaguely rawhide colored look.  But I wanted something darker like rawhide thats sat in a museum for 200 years.  I was able to achieve that look, or so I thought until I questioned other people what it looked like and they said it looked like tree bark.  What I had done was mix oil color with varnish and I painted that over the original varnish coat. 
If I had read the label on the varnish I would have found out that once the varnish is fully cured, you need to sand it before you try to paint over it.  As you might guess, I just painted without sanding and so after about a year or so the new paint turned brittle and on exposure to sun started flaking off a little at a time.  As I said, I liked the look - kind of like lichen on a rock or a seal with the mange, but I finally had to throw in the towel on this paint job and scraped and sanded and then covered it over with a coat of gray latex paint.

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