Showing posts with label double. Show all posts
Showing posts with label double. Show all posts

Unangan Single Bladed Paddle to Double Conversion and Back Again

When I first saw this picture of a double bladed paddle, I thought it was a new Aleut type.  And so I made a copy of it.  As it turned out, it was too short for me and I never used it after its original trial. Later, the photo showed up on some forum and somebody perceptive pointed out that the double bladed paddle looked like it was two single bladed paddles lashed together, possibly after having been sawed to better fit together. Sure enough, if you look carefully, you can see the lashing that made one paddle out of two.  The picture was taken at the Chicago Field Museum when it was the site for the World Fair.
The problem with using a single bladed blade shape for a double-bladed paddle is that the single bladed paddle is designed to be used more or less vertically so that the full blade is immersed in the water at then end of the stroke.  The blade on the double bladed Aleut paddle is widest near the tip so you can get more blade in the water at the beginning of the stroke at a lower blade angle.

Click on the photo for a better view.  Note the single bladed paddle tucked under the improvised double bladed paddle.
Just recently, it occurred to me that the one paddle out of two process could be reversed and if I cut my too short double paddle in half and spliced some more wood to it. Then I could have two usable single bladed paddles instead of just one unusable double bladed paddle.
The double cut in half on a bandsaw. The half on the right already has its extension glued to it. 

And here, a close-up of the sliced portion of the paddle.
Soon as my paddle transformation is complete, I will report on the performance of these paddles.
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Fire Good Fire Bad and Whatever Happened to Pyrodiversity


I recently bought a book called California Indians and Their Environment. California Indians unlike most of the other Indians in what is now the US had never developed any agricultural technologies.  Instead, California Indians made their living exclusively off plants growing wild in their environment.  However, Indians managed their environment by burning practices that encouraged their food and medicinal plants to thrive.
Enter the Europeans.
Fire, an environmental management tool for the Indians was a threat to property for the Europeans.  The use of fires intentionally set  by the Indians, what are now called prescribed fires was outlawed by the Europeans. I imagine that the dwellings of Indians were subject to fire damage just like the dwellings of the Europeans but given  that the Indians set fires to manage the vegetation in their territory did not build dwellings where they would get burned down.  In addition, Indian dwelling may have been more temporary or movable and therefore more disposable or more easily relocated if a prescribed burn was called for.
I have never seen the reasons for antipathy to fire spelled out anywhere in text, but the idea that fire is bad seems almost self evident probably at least in part because of a massive public relations campaign by the department of Agriculture.  The appeals were mostly emotional and aimed at a population that probably had very little contact with forests on a day to day basis. The reasons for preventing forest fires are primarily economical and have little to do with ecological concerns.  Fire is a natural phenomenon and ecosystems have adapted to fire and in many cases depend on fire to keep the ecosystem in balance.  Not so in National Forests managed by the Department of Agriculture.  National forests produce lumber.  The lumber is sold to lumber companies and the Department of Agriculture collects money when the trees are cut down.  Trees that go up in smoke dont produce any revenue and whether by training or by natural disposition, most people, myself included dont like the look of burned over forest. 
The National Park people on the other hand dont sell any lumber and so they can afford to let forest fires burn.  No revenues are lost as a consequence.  Perhaps park attendance goes down during a forest fire but quickly picks up again afterward.  National parks even do prescribed burns since some trees like the giant Sequoias dont reproduce unless the ground is burned over.
But back to the Department of Agriculture anti fire campaign.  While the motivation to prevent forest fires was primarily financial, the advertising campaign instead focused on the fact that forest fires could potentially kill cute baby deer and bears, and so Smokey the Bear was created.
OK, so fire wastes resources, not to mention displacing or possibly orphaning young deer.
Heres the orphaned deer theme again.  no mention of wasted resources this time.
And again, this time, who knows, might be Smokeys nephew thats getting bandaged up there.  Smokey wants to know WHY?
This time, no orphaned animals, but the implication is clearly that those two cubs would be in a heap of trouble if there were to be a fire.  Smokey meanwhile is taking a break from shoveling dirt on top of camp fires to read a fan letter.  In the background, city dwellers recreate on a lake in the woods at a forest service campground in an environment of statuesque ponderosas unmarred by fire.
And for the children, a reminder that theres lots of critters that would be indisposed by forest fires, the advertising campaign bleeding out into the culture at large via childrens books.
And finally, WWII poster.  Needs an update there with Putin and Osama.









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Double Ridged Unangan Aleut Kayak Paddle

A while back, Suzawa Ikunori of Japan posted some pictures of several Unangan paddles in a Japanese Museum. Unlike most of the Unangan paddles I had seen before which have one face which is more or less flat and one face which has a ridge running down the center,  these paddles had ridges running down both the front and back faces. 



The paddle is quite long assuming the the loom is the usual length of about 22 to 24 inches.


This photo shows three of these double ridged paddles.  The middle one seems to have some damage to the tip.

And this is a drawing of the paddle blade and the relative size of the ridges and the location of the blade edge.
It appears that the layout of the blades is similar to that of the single ridge paddles except that the normally slightly convex side of the blade also has a ridge carved into it.  I have taken one of my single ridged paddles which I found to be too stiff and heavy and have carved away at the flat face of it to create a low ridge on that face.  Testing of this configuration is still pending. 
One thing that double ridged paddles might eliminate is arguments about which is the right way to hold them, ridge forward or ridge backward.  But since the paddle is not symmetrical, there is still room for argument.  I hope to test my own version of the double ridged paddle soon and report on results.
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