| From: Tim Baker
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| Date: 20-Dec-21 |
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Cut a straight Gemsbok horn in half, lengthwise. Overlap the pointed ends by 5 inches. Wrap the overlap/grip grip securely. You're done.
In the pictured bow most of the bending is near the grip, the rest of the limb being relatively straight, so stack is lower than typical for a 41" bow. The unreduced base of the horn rests toward the nocks so outer limbs are quite wide and heavy. Speed with an 18 gpp arrow was 103fps.
This was a relatively skinny horn, so the 3/8"-thick bending area only allowed 17lbs at 23". Other horns would allow 1/2" thick working horn, for a bow in the 30lb range.
A sinew cable back could near double that. Horn with considerable natural reflex would have better cast.
The ends will be narrowed on any future models. Kids love the rugged wild-animal corrugations so they were left on for that look. These are great kids bows.
For future versions, since they mainly bend near the grip, the outer half of the limb might be cut off, replaced with a light wood extension.
Adam Karpowicz emailed that similar all-horn bows are seen in museums, that people seemed to play with the idea for centuries. Such bows were likely one route to later proper composites.
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| From: Tim Baker
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| Date: 20-Dec-21 |
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Another version, but with the base ends overlapped at the grip, was 45" long. 17lbs at 24. With narrow ends toward the nocks speed was 116fps with an 18 grain per pound arrow. Brace height was 4" Gotta try a sinew cable back, maybe doubling the weight.
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| From: Altitude Sickness
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| Date: 20-Dec-21 |
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With the second version. Would the leaf spring tactic from your previous post. Or a wood backing work??
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| From: Tim Baker
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| Date: 23-Dec-21 |
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Just found that bottom horn bow hiding in a corner. The plan is to secure the base ends to the ends of a 12" or so 1 1/8" diameter branch, this lengthening the bow and creating a comfortable grip area. The crowned side will now be the belly, a sinew cable somewhat elevated above the concave side. Never heard of such a design but it might have exceptional cast, the elevated sinew forced to do far more work per mass than normally, the 'hollow' concave limbs having low mass also, the elevated sinew holding the unbraced bow in large reflex. Will possibly replace the heavy outer half of the horn with narrow, thick, light wood. We'll see.
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| From: Catskills
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| Date: 23-Dec-21 |
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This is pretty cool. I will reveal my ignorance: Where does one get gemsbok horns ?
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| From: reb
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| Date: 23-Dec-21 |
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Cool.
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| From: Wayne Hess
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| Date: 23-Dec-21 |
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That’s better than a sapling, if you have access to Horn, Nice
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| From: Corax_latrans
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| Date: 23-Dec-21 |
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“ I will reveal my ignorance: Where does one get gemsbok horns ?”
From Gemsbok, silly!!
LOL…. I think they were sold out at Walmart, last I checked!
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| From: Corax_latrans
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| Date: 23-Dec-21 |
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“ I will reveal my ignorance: Where does one get gemsbok horns ?”
From Gemsbok, silly!!
LOL…. I think they were sold out at Walmart, last I checked!
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| From: cobra
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| Date: 23-Dec-21 |
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Very unique. Good job.
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| From: Arvin
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| Date: 23-Dec-21 |
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What would happen if you put the bases of the horn together and slightly thinned last four inches or so at the tips? Just asking? Arvin
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| From: Arvin
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| Date: 23-Dec-21 |
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Looks like one happy young man though. Well done!
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| From: Tim Baker
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| Date: 23-Dec-21 |
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Google gemsbok horn and sellers will appear. Many for sale on ebay too. Get the straightest one possible, so both limbs will have equal curvature. Or buy two horns with equal size and curvature, cut both in half and pair the two reflexed halves together for one bow, the two deflexed halves for another bow.
Arin: Yes, the base of the horn will be at the grip, and more. See my last posting above.
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| From: Arvin
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| Date: 23-Dec-21 |
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Corral reef Enterprizes out of Florida for the Horn. About a 1.00 per inch of length. Minimum order I think is 100 bucks.
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| From: Tim Baker
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| Date: 23-Dec-21 |
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Took the top pictured bow apart, whittled a handle to fit the curve of the bases and roughly tied it in place for inspection. The former open belly will be the back. It will be strung backward as shown here while an elevated sinew cable is attached, this holding the bow in considerable reflex. The outer limbs might be replaced with lighter wood, maybe. Next step is making the sinew cable. This might end up being a dumb design, maybe not.
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| From: George Tsoukalas
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| Date: 23-Dec-21 |
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Very nice, Tim. I like to see happy kids with bows of any ilk. Jawge
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| From: Catskills
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| Date: 24-Dec-21 |
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I guess mine really was a dumb question. The answer is the same answer to everything: Google it
I wonder what other magical materials are out there to make bows. Dried sting-ray tails ?
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| From: Arvin
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| Date: 24-Dec-21 |
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Don’t get Tim started he can make bow out of anything I think!
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| From: JMartin
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| Date: 24-Dec-21 |
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Pretty dang cool!
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