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Blacksmith's *s'Gretel* 78" Yew Warbow +125#@32"
Ruddy Darter:
I think a perfect arc is always best, an even draw throughout with a smooth constant loose with the whole bow working evenly. And better for the bow long term as set begins to happen mid upper limbs if tillered like this, the minor advantage is o.k. for a compitition bow maybe but not worth it for a regular everyday bow, just my personal opinion and preference, I feel an even arc gives the bow a lasting strength and makes a sweeter shooter.I'm always going to aim for a perfect arc myself...when I can find some wood :), still, a very nice bow and excellent work . 8)
Ruddy Darter.
Marc St Louis:
--- Quote from: bownarra on November 23, 2015, 02:09:03 am ---
--- Quote from: Marc St Louis on November 19, 2015, 07:09:24 am ---Very nice. Any particular reason you have the outer limbs doing most of the work?
--- End quote ---
This how to tiller an elb. Perfect in my eyes.
After a few hundred elb's and monitoring set on them all this is the 'correct' tiller shape. People talk about 'full compass' tiller but to get the handle doing too much is a mistake. As the fella says it has loads of early draw weight and I bet it wouldn't if it had more bend in the center.
--- End quote ---
Interesting theory but if you look at the unbraced profile you will see that the bow took more set in the outer limbs. It is true that tillering the bow like that will reduce hand-shock though. Getting a bow to work where there is more wood to do work is always better for longevity and there is always more wood to do the work in the middle of the bow.
I've made a few ELB's myself.
In any case a very nice bow
Ruddy Darter:
*apologies, when I write mid upper limbs I mean mid "outer" limbs, noted I have to correct my terminology*
Ruddy Darter.
bownarra:
Ruddy - Wood at a given thickness can only bend so far before it takes set. Fact! You make that piece of wood thicker and it can only bend to a lesser degree before taking set. Make your piece of wood thinner and it can bend further....again these are simple plain facts!
Now look at an elb......notice the large thickness taper. Apply those facts to a tapering piece of wood.
The tiller shape for an elb should have a little bend through the handle (depending on what you want the bow for, target only a little less bend is ok) and as the wood gets progressively thinner towards the tips the bend should be increasing proportionately.
Marc - the bow should take more set in the outer limbs? Why would you want set in the inner limbs? Any set there would have a negative effect on string tension and therefore performance. All this talk about getting this part or that part of the bow to do more work is a misnomer the whole bow should be working evenly. EVERY part should be strained to the same level, afterall wood doesn't know where it is on a bow it only knows the strain it is feeling and will respond accordingly eg. set or not. I don't hold with what you say about the part where there is most wood should be doing the most work. If you did a strain analysis of this bow I bet you would see that the inner limbs/handle area is doing plenty of work! My guess would be about the same strain as the outerlimbs. That handle area cannot bend much because if is a thick piece of wood BUT you can bet your bottom dollar that it is strained it certainly isn't sat there doing not much.
It's not a compettion of who's made the most bows you know! I only said that because I see a load of comments from people who clearly haven't made what they profess to know about and I was just quantifying my statement. I won't comment on things i'm not certain about.....I'm sure you have made many bows and are very good at it! ;)
Ruddy Darter:
"Ruddy - Wood at a given thickness can only bend so far before it takes set. Fact! You make that piece of wood thicker and it can only bend to a lesser degree before taking set. Make your piece of wood thinner and it can bend further....again these are simple plain facts!"
Thanks for the info, very helpful... I've often wondered why bows are bigger in the middle and got thinner towards the ends, clears up that little puzzler for me. 8)
Ruddy Darter.
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