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My horn bow build-a-long

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DC:
I thought I would bring Bownarra's measurements back here

"Here are the measurements from my 40ish# bow. 121cm.
Center - 33mm
5cm  - 26mm
10cm - 14mm
15cm  - 10.4mm
20cm - 9.6mm
25cm - 9.1mm
30cm - 8.9mm
Kasan eye 35cm - 9.5mm
40cm - 12mm
45cm - 13.5mm
50cm - 14.5mm
Base of tip 52cm - 17mm"

I'm a little thick(that's well known)at the 15 and 20 cm marks so that kind of goes with J's comment. I'm just not confident that I have enough horn. Maybe I can take a bit of horn and a bit of sinew? I heated the eye on the right limb and took a little reflex out. We'll see if it holds. It looked better to my eye. I'm not doing much, still got the crud.   

JNystrom:
Well, its not an easy task to make a hornbow. I've broken plenty :D.

In case you run out of horn in sal section, basically the only effective thing to do is to add sinew to the outer limbs. Then while drying, make an effort to reflex the outer limbs as much as you can.
Other choices are to deflex bending parts or narrow them. But those doesn't really add much.

I think you have good chance of adding 2mm more sinew (as a kasan ridge). Do it in two rounds and roughen the existing sinew back properly.
Some old bows actually had even a 4-5mm thickness of sinew in the kasan ridge. Adam K. writes in his book that if you run into this kind of tillering problem or bow coming under weight, under sinewed or such, adding sinew layer after long curing is still viable option.
After this extra layer, i wouldn't wait more than 2 weeks to continue tillering.

If you can take of sinew from sal sections, after that you would need to put a full layer of sinew on top of sal, to bind everything together. But that is a viable option too. Actually, you might be best of by using both, taking of sinew from sal (if there is too much in the first place!) and adding sinew to kasan.

DC:
If I add more sinew the DW will go up, right? If it goes over 40# it's just a wall hanging for me, I can't pull it.

" Here is some measurements of some of my bows, a typical turkish: limb next to handle 13mm thick, mid sal (most bending part) 12,2mm, kasan eye 11,7mm and from there quite fast growing to  kasan 15mm. "

What is the DW of this bow?

DC:
Is a tillering tree ever used?

JNystrom:
As i described, you can take of sinew from sal and add to kasan. Cause now the balance is wrong. Just an idea. This wont raise the draw weight, but balance the bending.
If you already have only the minimum 2mm of sinew in sal, then the problem is your core. Its hard to go and tiller your core at this point.

I gave those measurements as a example of proportions, that bow should be about 90-100 pounds when tillered.

Tiller tree is used when you get to brace the bow and have it straight, so it wont unstring itself.

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