Main Discussion Area > Bows
“Y” or “V” cross section
Jim Davis:
Go ahead. Defy the physics of wood bows. Draw your own personal conclusions from the failures. You can have a personal relationship with the conclusions recorded down through the ages since the invention of writing. Maybe you could test out your own designs for wheels while your are at it. ;-)
mmattockx:
--- Quote from: superdav95 on October 31, 2023, 09:07:53 am ---I’ve messed around with this idea on the tips of my molle style bows. Here’s some pics of the lever on one of my molle bows. It made the transition look nice and it’s functional in that it reduces mass. I could have gone even thinner on mine here really.
--- End quote ---
Those look great, but you can remove more mass for the same strength if you flipped the triangle around and put the narrow side on the back. That assumes your wood is compression strong as most of our bow woods are. If you were using something tension strong like cherry then your levers are correct.
Mark
superdav95:
Thanks mmattockx. These are hickory bows. There are known for good tension strength as well. They are ok in compression to.
Selfbowman:
Jim I don’t get it. Your an engineer aren’t you. You convinced me with the pyramid! Yes I pushed the limits by putting recurve in the outer limbs. Putting more stress on the inner limbs. But it got faster just saying. Speed is not everything by any means . But is it not good to try to improve your skills?
Jim Davis:
There are limits to every stress factor. Bow design is limited by the nature of the materials. Nearly every wood is 3 to 4 times stronger in tension than in compression. Reducing the amount of wood that carries the compression load can only reduce the strength of the limb.
If the belly of the bow is narrowed greatly, the narrow ridge (or two ridges) will fail early, but if narrow enough and the limb is thick enough, the stress may be handled successfully by a deeper layer of wood. In that case, the bow will not fail, but will be carrying the failed ridges along for the ride with no benefit from that wood.
Yew has its own rules. I've never used it, but it does well with a thicker rounded belly.
Please forgive my earlier abruptness. I'm 75, and sometimes forget that I was a long time learning a lot of things that others learned earlier.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version