Primitive Archer
Main Discussion Area => Bows => Topic started by: simson on September 16, 2012, 05:25:41 pm
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Here is an osage hunting bow with static recurves and hollow limb design.The stave was a nice coloured piece with some areas of several pin knots, but still holding up so far without problems. Recurves are steam bent, selfnocks no overlay, handle buckskin leather, bends slightly in the handle. Simple stick.
cross section is a pipe section (right word?) and runs into a triangular section at the levers.
Specs:
57" ntn
4,5" bh
26" dl
85# dw
608g mass total
4" handle
3" levers
41/19 mm just below grip
43/15 mm midlimb
28/12 mm below levers
enjoy
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0002.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0006.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0047.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0031.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0017.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0012.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0011.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0008.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0036.jpg)
(http://i1252.photobucket.com/albums/hh576/orangesimson/Osage%20Hunting%20Bow%202/_DSC0042.jpg)
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nice bow , good tiller, i guess i have not seen one w/the limbs hollowed out what are the benifits of that type of tillering?
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Very beautiful bow. I will be making one similar, soon.
Did you add the reflex in the thickest part of the levers?
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Hunter: I always bend my recurves with extra wood (thickness) and work it down when shaping the levers. Hope I could answer your question ...
At the curve is most of the wood to stiffen it to static recurves
simson
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Nicely made bow, interesting cross section. Is it significantly harder to tiller?
Hamish.
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Great looking bow,cool design. :)
Pappy
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Looks good - probably the heaviest osage bow I've seen. Any concern about the "dings" on the back and it letting go over time?
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A beauty AND a beast! ;D
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Love those lines!
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Very nice bow!!
Was 85#s your target weight? Tell us more about the purpose of the design. It looks like it worked out very well but what are the advantages?
Does this design give you more speed? Take less set? I mean 85@26 and only 57"s?
Very curious??
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Great looking bow.
Lovely limb shape, certainly qualifies as 'primitive'.
I'll bet that belly feels nice to your thumb.
Del
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That had to take a considerable level of skill to tiller that way. Amazing!
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I love this bow. The stats are very impressive. The design is something I have been wanting to see or try myself. Seems it would add lateral limb stability and really make use of osage's compression strength. I am dying to know how fast/far, does that bow shoot? Or just your opinion as compared to your other bows.
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Thanks everybody for comments!
sa: the benefits of hollow limbs are lower mass, compare a rectangular (cross section) piece of any material with a curved one ( kinda section of a pipe. Which one would be stiffer?
Please see the fantastic site of OL Adcock (http://bowmaker.net/index2.htm), he can it explain a lot better than I. Also interessing his statement about bow tuning.
I will post another with this hollow limb design in an other thread
Hamish: IMO it is a bit harder to tiller than an other cross sections
Parnell: I don't know what you mean with 'dings'. perhaps you have seen the print from my recurve jig?
coaster: I can shoot 85#, but here is my personal limit. Normally I draw 28-29 on target shooting. This bow is made as hunting bow. It shoots hard and very fast, can not say the fps - I have no chrono. But compared with other bows I estimate its over 180 (750gr arrow). The bow is short, but it bends through the handle
Del: The handle is upholstered with a thich leather strip for comfort
Gordon: Thank you for all the inspiration I got from your work
CMB: please see above
Again thank you all
simson
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Thanks for the pointers on the hollow/concave limb design. If you're up to it, you should do a build along that shows both the design and construction process for such bows -- do you just round the back and invert the belly? How do you find the correct radius? Do you use a special tool for tillering? Etc., Etc.
It's a beautiful bow and you should be extremely proud of it.
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Your bow is truly dished out compared to the Adcock bows which were only slightly dished toward the tips. The Adcock bow just turned out to be a case of skinny tips with no effect from the hollowed out limb, just hype in other words. I would be interested in how well your bow performs as well.
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Very unique and extremely beautiful bow. Well crafted, I love everything about this bow.
Greg
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You say hollow limb design, and cross section is like a pipe?
Does this mean cross section is round or....? Like a canoe?
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You say hollow limb design, and cross section is like a pipe?
Does this mean cross section is round or....? Like a canoe?
Take a look at his other thread, it's much easier to see it there. In essence, it looks kinda like
back C belly
Where the C is the shape of the limb.
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I like the amount of recurve you put in the bow, but it looks like your limbs have small cracks right at the bend on the belly side. Did you use steam, and do you think those cracks will pose a problem down the road?
Tiller is sweet.
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do you just round the back and invert the belly? How do you find the correct radius? Do you use a special tool for tillering?
The back is the natural grown grothring in its origin shape, I do not bend a radius in a flat limb or so ... . The belly is hollowed out with this tools
http://www.mehr-als-werkzeug.de/medias/sys_master/700945V_01_P_WE_4.jpg
http://www.mehr-als-werkzeug.de/medias/sys_master/711071_01_P_WE_4.jpg
http://www.mehr-als-werkzeug.de/medias/sys_master/703516_01_P_WE_4.jpg
and sandpaper
you have always to measure the thickness with a caliper. I made my own with a pencil hold on one side by a srew-nut so I can easily attach different thickness. Hope you understand my bad english ...
I would be interested in how well your bow performs as well.
Steve, please point me in the right direction. should I do some testings? IMO the hollow limbs are more springy (hope this is the right word) compared to flat limbs, in case of this bow there is really a lot of early drawweight.
I like the amount of recurve you put in the bow, but it looks like your limbs have small cracks right at the bend on the belly side. Did you use steam, and do you think those cracks will pose a problem down the road?
rps3 you are right, there are small cracks from recurve steaming/bending, they are not deep and I filled them with glue. So no problem, here is the stiff area of the levers.
thank you all for your input, very interesting!
I'm glad, I found this site ...