Primitive Archer
Main Discussion Area => English Warbow => Topic started by: Bob W. on October 08, 2017, 04:40:28 pm
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Greetings warbow enthusiasts, I spend quite a bit of time over here reading old threads and always look forward to new topics. Between Del and Wills and everyone else on both sides of the pond you guys rock, thank you! Well here is my first contribution to the warbow forum, the ELB I posted a couple years ago don't count even though I've since took the handle wrap off and added horn nocks. This Warbow was from an 80" live edge yew log that was 1 3/4" thick and 7" wide. The sapwood was toast so i cut it off and sawed a tapered slat right under it and glued a piece of bamboo I tapered right on top with about 2" of reflex. Well Ive been tillering her and would like your opinions and advice. Shes got a mary rose profile or as close as I can get with about 2MM coming off every 6". Right now its 110# @ 28 and(https://i.imgur.com/VmPuCQo.jpg) thats as far as i have pulled on the tree. Thanks Bob
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(https://i.imgur.com/gXmii7n.jpg)Braced
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Hi Bob
Are you going for a longer pull?, or have much weight to loose?
from the braced view, my eye sez to scrape a bit on the left mid limb. The full draw pic would be easier to evaluate if it was taken straight on.
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+1 to what Willie is saying. Cheers- Brendan
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Your right Willie a better pic would help , is this better? I could take it to 32 if my tiller looks good at 28, does'nt really matter I can only pull it back 20 or so inches now. Thank you Brendan as well!(https://i.imgur.com/CGQdUvJ.jpg)
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I took the liberty of drawing an ellipse over your pic. Not to say that the ellipse is a "correct" shape, but just to aid in seeing symmery if that helps. I do think that your corrections should stay away from the center third. looks like just some minor tweaks to get you good. :)
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Excellent, Thank you Willie!
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Ah! This shows up the problem with the "Ellipse". There are an infinite number of ellipses! And a badly fitting ellipse is worse that pointless.
No one actually has ever defined how elliptical the ellipse should be and that's my big beef with the whole thing! >:(
IMO, arc of a circle or slightly elliptical is fine!
Here's my Ellipse... it's nearly a circle but not quite and it's near perfect IMO :)
Here's another one too, I think they both show the left limb being a hint stiffer which is fine if that's the lower limb.
Del
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Del, that ellipse seems to match up pretty close, the left limb is the bottom so I am good there. Thank you, Bob!
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Del, that ellipse seems to match up pretty close, the left limb is the bottom so I am good there. Thank you, Bob!
I've just measured the ellipse (in MS Paint) and it's 805 wide and 735 high, so it is a bit elliptical... dunno what to do with those numbers or what they really mean ::) except it isn't a circle ;D
I think it illustrates how "elliptical" is hard to quantify meaningfully.
Del
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I think it illustrates how "elliptical" is hard to quantify meaningfully.
Del, you bring out a good point, that a method such as using ellipses in paint, in order to judge correct tiller, needs to be quantified. I actually do quantify, in my own notes, the ellipses I use when tillering my own bows. I would need to build a few more with different tillers, and do some comparative shooting, before I could offer any specific suggestion or recommendations.
No one actually has ever defined how elliptical the ellipse should be and that's my big beef with the whole thing! >:(
Of course , if one wishes to replicate a Mary Rose warbow tiller shape, that would need to be defined somehow. Just out of curiousity, has anyone seen any study done on the differences between the bows found on the ship (regarding profiles and expected tiller shape)?
Having taken a second look at the pic I posted, I realize that it is not very becoming of Bob's nice workmanship, and will let your more well fitted drawing serve as an example of the usefulness of paint.
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At least one of the MR bows was taken to close to full draw.
I'll look for a pic... Ah, got it, from Robert Hardy's book "Longbow"
Del
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When you draw an ellipse for checking tiller, where do you put center of it? At desired draw length?
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When you draw an ellipse for checking tiller, where do you put center of it? At desired draw length?
I move the ellipse about for best fit, then look at where the centre and "corners" are.
I start off with the top centre roughly at the grip and the drag the corners around.
Del
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What software are you using?
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Thanks for scanning the pic ,Del. it looks straight-on enough to be able to work with in paint.
In a nearby thread, I have plotted some average dimensions for MR bows, but have no idea if bow 1648 is typical or average.
Have the dimensions for 1648 been published? Hopefully, if so, someone might be kind enough add 1648's dimensions to the other thread. No need to side track Bobs presentation any more than we already have.
http://www.primitivearcher.com/smf/index.php/topic,61640.0.html
stuck, I use inkscape
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What software are you using?
MS Paint
Del
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Cheers
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That tiller, imo, is about as good as it gets. Don't mess it up now ;-)
I also tend to use inkscape (a freeware vector program), you import the photograph as a bitmap, and draw a circle or arc of circle over it, and modify the dimensions as needed.