46301142 Making an Asiatic Composite Bow

Making an Asiatic Composite Bow

by Markus Klek

What is an Asiatic composite bow?It is the most sophisticated and technologically advanced type of bow, being made entirely of naturalmaterials like wood, horn, sinew, and hide or fish glues. These type of bows have been developed inmultiple styles all over Asia and were in use until slowly replaced by firearms. Several of these bows arestill being made by professionals today.

This is the first bow of this type I have made and it was more of a learning process than anything else. Iwas able to make a bow that shoots and did not break, but it was a far cry from a masterpiece.

After having made a number of selfbows and sinew backed recurves, this king of bows was always in theback of my mind. Over the years, I collected materials and read articles and books on the subject and itseemed harder and harder to actually make one. Then suddenly, while my lovely wife was on a trip toIndia, the time was right.

I did not replicate a certain bow or any specific style of bow, but opted to make a bow that would be onthe safe side, that would not break or warp and be reliable to use.

This article will be on the work process only and not on composite bows in general.

Getting started:

The Horn Strips

The length and width of the bow were pretty much determined by the pieces of horn I could cut from thegemsbok horns (Africa) that I had ordered.The horn was split down the center into two halves with a hacksaw, while being held in a vise. The solid

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tips and the somewhat thin and frizzy ends were cut off, so that I ended up with two pieces, 19 incheslong. Then the rippled outside was worked smooth with a coarse file and the inside was shaved down witha homemade tool held at a 90 degree angle, in order to achieve an even thickness of ca. 3/16 inch.

Finish strip, unworked horn and horn shavings

This was many hours of work already, but now the fun starts.Bending those pieces into nice flat strips that actually end up looking like store bought pieces of fiberglass.What an amazing transformation!!!By boiling the horn and clamping it down flat, it will stay in that shape once cooled. I used a big squarealuminum foil dish and put it over two flames on our kitchen gas stove. In my case, the horn is beingclamped between two solid flat surfaces like a block of wood and a metal strip.If you put your C-clamps right on the horn, you will get some deep dents. Now place the whole assemblyunder boiling water with only the C-clamps sticking out so you can gradually tighten them while the hornsoftens. I boiled the hell out of the horn and it was not damaged! Refill your pan with hot water whennecessary . It took a while of fiddling with those clamps while steam was fogging up my glasses. I burnedmy fingers on the hot pan and almost got boiling water on my feet. Imagine the workshops back then,where they were working on batches of 500 bows at a time.Once I got those pieces 90% flat, I took a knife or file and filed them into nice rectangular strips. I thenshaved the horn strips to their final thickness of 2/16 inches. The final dimensions were: 19 inches long,2/16 inches thick, and tapering from 1 inch to 1 5/8 inches wideHey, look at those two neat strips!!!.

The Wood Core

I used rock maple for the core. Moreover, as with a piece of wood for bow making, the grain should runstraight. I did cut it with a table saw into a rectangular strip of 2/16-inch thickness. That's it!!

The Handle

The handle will be glued to the back of the bow and not to the belly as with self-bows.Some bows have an extreme reset in the handle, but I settled on ca. 20 degrees because more reset wouldstress the limb-handle connection more and make the bow unstable.The question of how thick, how wide and how long of a handle to make takes some playing with thosevariables. I tend to make them fairly chunky because weight in the handle does not slow down the arrow. Ifeel it adds weight to the bow where it is permissible and so adds stability (any comments?).I make bows symmetrical, meaning no long and no short limb and I shoot from the center just holding thebow lower in the handle. Why? I don't know. The handle ended up to be ca. 6 1/2 inches long, 1 1/8


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inches wide and 1 1/2 inches deep. I steamed the wooden core and clamped it to the handle. After itcooled and dried, I glued the pieces together with epoxy.

Gluing Horn to Core

Epoxy sounded like one more safety feature. I did not have the nerve to play with fish glue!I made the horn reach ca. 1 inch into the handle and filled the space between the two horn strips with apiece of sheet brass. Again to add weight to the bow. I used metal straps as support for an even gluing and8 clamps on each limb. After that, cut the excess wood to match the horn. At this point, I used rawhide tobind the handle-core-horn connection, as this area will undergo a lot of stress.

The Ears

Spruce is recommended for its lightness and stiffness, so I opted for 6 inches long ears coming of at anangle of 45 degrees. I made them out of two parts, to leave the limbs as long as possible and to get anextra glue line. Next time, I will use a less complicated way of making them. However, at this point I didnot want any part to break off or separate when I string that bow up.The grain ran nice and parallel with the ears and they ended up being just under 1 inch thick and taperingfrom 1 inch to 1/2 inch at the tips. I also bound that ear limb connection with rawhide strips.

Spruce ears being clamped on. Finished ears after shaping.


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Sinewing

I used roughly 8 deer backstraps and 7 leg tendons. I sinewed the bow the same way I would sinew anyother bow. Two layers were put down. Then I waited 7 days and put on another two layers. My hide gluewas rabbit skin glue from the art store. Before putting down the sinew, I pulled the bow into more of areflex and secured it with a string between the tips. In addition, I bound the handle and ear areas somemore to hold down the sinew. I took a 4 week break while everything was drying!After removing the string between the tips, the bow measured 18 inches of reflex between handle andears. On one side of the handle, an air bubble had developed between sinew and wood core. The sinewprobably pulled up while shrinking, even with it being bound down. After some debating of what to do, Idid not touch it at all and oddly enough, the bubble seemed to have disappeared.The misalignment of the limbs that occurred and seemed to come out of the handle area might havesomething to do with that flaw, but unfortunately, I did not mark if it was left or right of the handle. So myadvice is, always mark the areas where some irregularities appear, so that you might learn something ifthat area later ends up being a weak spot.

Shredded sinew and the bow ready to be sinewed.

The Covering

I did not sand the sinew smooth but covered both limbs with thin homemade goat rawhide that I had dyedbrown with black walnut husks. I slightly soaked the hide and then just laid it on, overlapping onto thehorn. No binding was necessary. The handle area is covered with a dehaired road kill squirrel skin (finally,I found some use for that tiny hide).

The Bridges

They were made of two oval pieces of thick leather each. I soaked the parts in hide glue and then clampedthem together to dry. This makes a nice hard fileable leather. I concaved one side to receive the string andthe other side was ground to fit the knee of the ears. Elmers glue held them in place. They are 1 1/8 by 113/16 and 1/2 inch thick more than I needed actually.


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The Nocks

For the string nocks, I cut a square section out of the ears, a little less than half way through and glued in apiece of horn with a groove just deep and wide enough to hold the string. This is another area that receivesa lot of stress. Cutting the nocks any deeper was somewhat scary.

The whole bow got three coatings of homemade varnish, made from finely ground pine pitch dissolved inalcohol. It looked great and had a wilderness smell.

And now, I'm finally done!!!

Nevertheless, the worst part is stringing that thing. I had tremendous respect for the weapon I created afterI had read how powerful these tools can be and what a procedure it was to string them.

Stringing the Bow

So far, I have not spent much time on the bowstring. I replicated a Korean bowstring made out of separatepieces for the loops, tied onto the main string. But the knots for tying seem to stretch out, so I will have towait for some advice from the pros.I nailed together a crude stringing jig, put the bow on it, got all breakable things out of the way, locked thedog up, put on full body armor, and strung the thing up. I gradually pulled it over a couple of days.Everything was fine, no cracking, no nothing.BUT! The limbs are not perfectly aligned and the bow only draws about 40 pounds at 32 inches. (I haveno problems with finger pinch with the bow being 55 inches measured along the belly) Therefore, it seemsto be a fairly slow shooter. In addition, the reflex came down from 18 to 10 inches after a while. Howthose guys get the tips to touch is still a mystery to me.


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The bow in the stringing jig, with one limb bent.

Heat Treating

To align a composite bow, it needs to be heated and clamped into the desired shape. Taking horn off thebelly is the last thing you want to do. So, what I tried was a localized heat box. Meaning, I put a piece ofwood and C-clamp in place (limb seemed to come off at a wrong angle from the handle) and encased thewhole area with cardboard and tape. I left an opening for a hair dryer. Also, the top of the C-clamp wassticking out. While the heat inside build up, I gradually tightened the clamp. After a cooling down periodovernight, I restrung the bow and it looked pretty good. However, after a day of shooting, the problemcame back. I need help from the pros!!!

All in all, this bow is a beautiful piece of work and I marvel at the combination of materials, each doing itsshare and fitting into the whole. Nature at its finest, once more showing me again that everything isconnected and all things work together as one.

With this, I will leave it.

My thanks to the three volumes of the Bowyer's Bible and Tim Baker for his telephone counseling.Check out these web sites for more infomation on composite bows:- www.student.utwente.nl/~sagi/artikel/- www.atarn.org

E-mail your comments to "Markus Klek" at [email protected] Klek resides in Germany.

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46301142 Making an Asiatic Composite Bow