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Interesting HLD bow explosion (Pic heavy)
BoltBows:
--- Quote from: Jim Davis on November 20, 2018, 05:24:46 pm ---One thing seems to be missing from this post mortem. When a half cylinder is bent, there is more happening than simple longitudinal tension and compression. Bending opens the radius so that the inside radius is in tangential tension---and has almost no strength to resist that tension.
Try bending a long piece of PVC that has been sawn in half lengthwise. It probably won't break easily, but it will have a nearly flat cross section where it kinks.
O.L. Adcock tried to revolutionize laminated fiberglass bows by making the limbs concave. Lots of hype, but only a memory now.
--- End quote ---
Hi Jim, you have a good point on the tangential tension, something I’m aware about. I think the question is if it adds something to peformance or doesn’t. For sure it shouldn’t be overbent because like you point out, it will just flatten and break. However I think if the flattening effect is kept to a certain maximum, it might even benefit the bows peformance. If I’m not wrong it will even smoothen the draw a bit.
Enough stuff to experiment on! That’s what makes bow building fun!
Ps: please don’t take this the wrong way, but Da Vinci also tried to build flying machines. Not everything will work the first time. Maybe this also won’t! But I want to find out.
Jim Davis:
Boltbows, I am sure such a bow will hold together if the stresses are limited to what the wood can bear. Don't know what to think about a performance gain. I think any gain would be due to reduced limb weight and perhaps less hysteresis.
leonwood:
My experience is that HLD bows have less set also, so the combination of lower mass, less set and les hysteresis (which are all performance killers!) when added up it is a good possibility that HLD does enhance the performance of a bow ;D
Badger:
I am curious about the mass, are there any examples that show the mass and dimensions?
leonwood:
--- Quote from: Badger on November 23, 2018, 11:06:16 am --- I am curious about the mass, are there any examples that show the mass and dimensions?
--- End quote ---
I can measure the dimensions, draw weight and mass of my black locust bow if that helps?
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