Main Discussion Area > Bows
6 piece Asiatic style bamboo bow
superdav95:
--- Quote from: Bob Barnes on March 06, 2022, 09:56:38 am ---I'm following your experiment...it looks like it would have a very heavy draw right now. Very cool... :OK
--- End quote ---
Thanks. It would be nice if it survives. Ya it’s quite heavy in draw right now. I’ll get to scraping belly and narrow up the limbs bit more before bending too much. I’ll post results good or bad of what I find.
bassman211:
I will be anxious to see how much limb reflex you lose when you are finished tilllering ,and hitting poundage at you draw length.
superdav95:
Well I got part way thru tiller and got it braced at about 5.5-6” at which point I heard a pop! I’ll post a couple pics but looks like the failure may have been due to my over toasting the top boo lam a bit. Under the lift it looks pretty dark and brittle. I had it rolled out to only 21” so still had a ways to go and it was at 48lbs draw. I’m guessing that it’s a failure of the top strip or and a combination of a few things on my part. The other thing I think may have contributed to this is no wraps either at the handle. Also the hot melt glue I used for purposes of reversible nature of it and swapping out different limbs may have failed. My hunch however is that this is a simple failure of that particular slat of boo. The reason I say this is that after making about 20 of these little bows over the past year this is the first time I’ve seen a failure like this at the handle. The hot melt glue I use for these test bows is quite strong. Surprisingly strong. Obviously I never shoot these with out wraps on the glued sections for safety but often I would brace them up for some final scraping and them wrap them. I wonder that maybe the reason it popped off a lift like this at the handle when braced and not when on the tiller tree is that it’s being held at brace for a longer timeframe then when pulling on the tree and releasing almost instantly. Other failures that I’ve seen in these bows have mostly been splits in the limbs running with the grain. I believe due to over heating the boo and making it brittle. It’s a fine balance heat harden bamboo and rid a lot of the moisture without going too far. If done right though you can end up with a good little quick bow. Prior to the failure on this little bow it seemed like it was going to survive and hold up. It lost about half of the induced reflex as seen from the pics. I’m gonna keep at this concept and try what mike said and taper the strips out to the tips to a thickness of 1/8”.
Here’s a few pics of where it failed.
Let me know what you think and your theory’s as to
Why it failed.
Cheers
Bob Barnes:
sorry to see that. I hope that you can figure the break out and reuse most of the parts.
bassman211:
That is were they will let go. I have broken a few limbs off in the same place right in front of the riser. Though the side profile of your bow looks really nice you can only reflex a bamboo slat , so far before it takes a lot of set, or lets go. Sinewing the back may, or may not help. I never tried one that way.
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