Primitive Archer
Main Discussion Area => Bows => Topic started by: PatM on October 14, 2014, 11:21:37 pm
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Here is the second attempt at the Ipe/Bamboo flight bow I attempted earlier this year.
It's very similar but hopefully glued up better. ;)
I think I will add silk as the secondary backing rather than sinew this time. I'll request that this topic be moved to the flight forum after the bow proves it can actually shoot an arrow. ;D
Here it is so far.
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1792_zps21c33708.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1794_zps315ba14e.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1789_zpsea154239.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1788_zps73f15a3e.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1790_zps6df6e636.jpg)
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Looks pretty cool, Pat. Do you think you could reduce the outer tip width a bit to reduce the physical weight some more?
Looks like some of that good dark ipe like when it was first imported for decking.
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For sure. They are still in rough form. They will also be tapered to a teardrop cross section so the string loop can straddle the siyah. Needs a small bridge too.
The Ipe wedge is in there to stiffen the tips and allow a nock to be cut into the back.
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Nice. Love a slender, sexy spliced siyah. ;D
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If you can maintain most of that profile she should be pretty hot. What kind of weight are you going for?
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Pat, what is the length, 30" or so? I'll get up some pictures tomorrow of one I have roughed out.
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Wow that looks pretty sweet. Have you ever had a siyah come off before?
Would you ever huge a siyah splice under the bamboo backing?
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Thanks guys.
Eddie, did you mean 50? It is about that across the tips.
WG, Never had one come off but I always wrap a simple v splice as well. You can see the underlay over the splice but running the backing up the back of the splice as well eliminates any need for wrapping.
I would have done that but the bamboo piece was too short.
I do have another in the works that will have the splice covered.
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Very cool Pat. Looking forward to seeing it bent over.
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Very nice Pat. Personally I would trim the length of the siyahs down by a couple inches each but that's just me
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Very interesting bow design Pat, attractive style and just looks as though it will be a strong performer. This will one for some of us to watch and learn from for sure.
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Man I can't wait to see that thing bend. That is one wicked looking side profile :)
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Marc, I wanted to leave them a bit long so I could tip-toe down with the length and do a bit of exploring on siyah length.
The bows of this design that Harry Drake made seemed to have them on the longer side so I figured I'd start there.
Got the silk glued down tonight. I flattened the bamboo nodes to make everything be more linear so we'll see if silk is up to the task.
Thanks all for the comments.
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Why silk on top of bamboo? I know it's not heavy stuff but still....if this is going to be a flight bow why add extra weight?
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Flattening bamboo nodes gives me goose bumps. I'd never even consider that! If weakens the structure so much. Not even silk can strengthen it back to it's full potential. A raw bamboo backing is the best you can achieve.
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Great and fast!
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The silk is to test out a more scientifically applied silk backing. It is also there to protect any slight run-outs in bamboo fibers over such a short, narrow limb.
Then it is also there to contain things and protect me when I blow it up by overdrawing it . Which I intend to do. >:D
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Should be interesting
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Silk applied.
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1804_zps2e538caa.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1801_zpsf07a2ffb.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1802_zps5274ccad.jpg)
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Here's the old silk backing link again.
http://books.google.ca/books?id=oScDAAAAMBAJ&pg=PA140&lpg=PA140&dq=silk+bow+backing&source=bl&ots=CP09OxzTht&sig=adoSqAmd54bKfw6OMltbrsOdrg0&hl=en&ei=wpEiTaj8G4KB8gbn46mFDg&sa=X&oi=book_result&ct=result&redir_esc=y#v=onepage&q=silk%20bow%20backing&f=false
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I am glad that you wrapped it, I was going to suggest that, I don't think it will be any problem at all wrapped.
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The silk wrapped like that is just for a ballistics bag, right? Doesn't add any strength?
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does that mean the bow is pre tillered???
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It's not actually wrapped Steve. That's just the marks left from the tape. It does curl down the sides though so it's effectively 3/4 wrapped.
The belly is not covered.
As to whether silk adds strength try pulling a one inch strip in half. I put five layers on.
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I look forward to seeing this thing bend
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I'd worry about the Ipe blowing in my face. Have you ever seen that stuff let go?
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Here's a few more pics. Siyahs tapered a bit and refined. Black Cherry bridges in place and rough shaped. The bridges are lengthy because the belly was so narrow and I wanted a decent glue surface area.
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1808_zps4b85b3cd.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1814_zps97b38fbe.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1811_zps7aa43ee0.jpg)
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Looks pretty sweet! Ur work is always impeccable... Looks like ya got it handled
eddie, I've blown up 3/4 ipe bows I've made. One punches me in the face. I have one floor tillered now. Hoping I done it right this time.
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Stress points wrapped and bow strung. Managed to do a Flemish twist with long loops that don't twist themselves up the siyah.
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1861_zps212276a0.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1860_zps8fbd56e4.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1862_zpsabeaefe9.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1864_zps8a0393f8.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1866_zps246862e0.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1867_zpsf7e6cf12.jpg)
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looking great,, did you shoot it ??? :)
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Looking good Pat.
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Sweet! Like it a lot!
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Man I can't wait to see that thing bend. That is one wicked looking side profile :)
+1
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No full draw :(. Lookin great Pat.
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Full draw on a flight bow only happens on the range when going for maximum distance. ;D Not going to risk all for a pic. I did zip a few arrows from short draw. Pretty scary how hard a 20 inch draw from high string tension can throw an arrow.
I'm making a couple of bamboo flight arrows. Stay tuned.
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I think the bow should do well, looking forward to the results. Are you going to shoot a range of weights?
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When/where are you gonna test it Pat? Lemme know if you need a cameramen :)
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Probably just make a few of the lightest stiffest arrows I can, Steve. I'd just be guessing at the weight. I don't have a scale of any sort.
I have access to a few long fields Bubbles. I'll request filming services if things work out OK. :D
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Sweet.
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Here's a few more pics. Siyahs tapered a bit and refined. Black Cherry bridges in place and rough shaped. The bridges are lengthy because the belly was so narrow and I wanted a decent glue surface area.
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1808_zps4b85b3cd.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1814_zps97b38fbe.jpg)
(http://i399.photobucket.com/albums/pp78/pat_05/IMG_1811_zps7aa43ee0.jpg)
I've always wondered, but never asked... what's the purpose of the bridges on the static tips?
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I think it just helps with the string alignment. I often have problems on recurves with the string comming off the limb, especially with low brace heights.
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You'll hear all sorts of theories about the bridges stopping the string and shortening it abruptly and acting as a launching pad etc. etc. What it definitively does is give the string a definite stopping point when the siyahs are at a certain angle and tear-drop in cross section.
If the bridge was not on this bow the string loop would be resting on a virtual knife edge. If the limb flared out more at the base of the siyah the limb/siyah transition could act as the bridge as it does on some Turkish bows.
Look at a typical strung bow with bridges and then picture them removed and visualize what would happen if the bow was strung and shot without them.
The alternative is the bow with the belly groove and the narrowing of the siyah to the back. It's easier to make the tip lighter the other way, even with the added weight of the bridge.
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The bridge also prevents the siyah from tearing open the loop of the string.
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Surely the big simple reason is it makes sure the string stops at the belly and doesn't slip one side or the other allowing the bow to go over centre, throw the string off, flex the wrong way and explode.
Of course, on a modern olympic recurve (spits on floor ;D) with wide flat limbs the limb is wide enough to act as one big bridge.
Del