Turkish reflexbow disaster ...
Dear all,
below you can see my last construction. The bow had some mistakes, one hornstripe delaminated a little in the kasan-area and the grooves of horn and core suited not 100%. Anyway, to my astonishement I braced the bow without any lowest crackling. The string you see was too long (bracehight 10cm), but kept the bow braced good. I made a shorter string and the bow throw it off, without being hurted. I made little longer loops, braced it again and the bow throw off the string with the result you can see on the last picture.
Technical details: ntn 120cm, physical weight 350gr, core 5 pieces spliced, waterbuffalohorn, deerachilles tendons, hide-, tendon-, fishbladderglue, drawweight +50pds,
Peter
below you can see my last construction. The bow had some mistakes, one hornstripe delaminated a little in the kasan-area and the grooves of horn and core suited not 100%. Anyway, to my astonishement I braced the bow without any lowest crackling. The string you see was too long (bracehight 10cm), but kept the bow braced good. I made a shorter string and the bow throw it off, without being hurted. I made little longer loops, braced it again and the bow throw off the string with the result you can see on the last picture.
Technical details: ntn 120cm, physical weight 350gr, core 5 pieces spliced, waterbuffalohorn, deerachilles tendons, hide-, tendon-, fishbladderglue, drawweight +50pds,
Peter
:evil: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Peter, you are not alone with such a disaster.
It happens!
At first it looks like a kind of glueing failure, but it could also be caused by a crack in the horn.
Maybe you could glue it again, it would be worth the whole work, but usually that works not to well.
Go on! Michael
It happens!
At first it looks like a kind of glueing failure, but it could also be caused by a crack in the horn.
Maybe you could glue it again, it would be worth the whole work, but usually that works not to well.
Go on! Michael
I have some this accident too... For me its horn crack. I never have problems vith glue. All problems was vith horn or bad tenjing -rope bending technik. I know how you feel :shock:
your bow looks really good. I assume the gluing was not that perfect and second since a buffalo horn has different layers (like our nails) it might be, that in the kasan area/kasan eye you have scrapped off too much horn and damaged some(?)layers - and at the weakest point it broke off.
... do not worry too much, you still can repair this bow. File off the horn, do the groovings again (resp. clean them), put on several coats of glue and fix it with a new horn. Since now their is not much wood for the core anymore for easy binding/wrapping of the two layers (wood and horn) you may use a jig (i.e. thin tempered bamboo lath?) like the Koreans and use the wrapping technique with the rope or try the wedges technique. The breaking of a horn also happened to me once. The time cost is very high and also the uncertainties for repair whether it will work or not, but it is worth to try. Pleas let us know..
Good luck.
R
... do not worry too much, you still can repair this bow. File off the horn, do the groovings again (resp. clean them), put on several coats of glue and fix it with a new horn. Since now their is not much wood for the core anymore for easy binding/wrapping of the two layers (wood and horn) you may use a jig (i.e. thin tempered bamboo lath?) like the Koreans and use the wrapping technique with the rope or try the wedges technique. The breaking of a horn also happened to me once. The time cost is very high and also the uncertainties for repair whether it will work or not, but it is worth to try. Pleas let us know..
Good luck.
R
I have remove and put on new horn a couple of times.
Heat gun to remove, clamps to put on the new. Done in some hour.
Ones I did remove both horns and let it be for weeks with sinew on, I just let it hang in my shop were it don't dry below 15-20%.
Heat gun to remove, clamps to put on the new. Done in some hour.
Ones I did remove both horns and let it be for weeks with sinew on, I just let it hang in my shop were it don't dry below 15-20%.
I think I had a very similar catastrophe yesterday...
My Manchu bow replica crashed like yours while on the tiller. The failure in the horn went from midlimb to the "kasan". A diagonal piece of the hon strip separated with a loud bang, when the bow was on the tiller board for testing strength. I have no real explanation for what happened. The bow was at a draw of approx. 28 inches. I think that somehow the string left the nock notches, although that seems immpossible. If the horn blew away while the string was still attached I suppose the bare wooden core below the siyah must have been ripped off instantly at over 70 pounds draw weight. But surprisingly it is intact... The string was lying 2 metres behind the bow, I had to search for it ;-)
The bow was drawn so many times now I can?t think of a glue failure. But how can the string slip out of the nocks at nearly full draw?
It will remain a mystery to me. I learn that I have to watch the ends more carefully while drawing a composite on the tiller...
JJ
My Manchu bow replica crashed like yours while on the tiller. The failure in the horn went from midlimb to the "kasan". A diagonal piece of the hon strip separated with a loud bang, when the bow was on the tiller board for testing strength. I have no real explanation for what happened. The bow was at a draw of approx. 28 inches. I think that somehow the string left the nock notches, although that seems immpossible. If the horn blew away while the string was still attached I suppose the bare wooden core below the siyah must have been ripped off instantly at over 70 pounds draw weight. But surprisingly it is intact... The string was lying 2 metres behind the bow, I had to search for it ;-)
The bow was drawn so many times now I can?t think of a glue failure. But how can the string slip out of the nocks at nearly full draw?
It will remain a mystery to me. I learn that I have to watch the ends more carefully while drawing a composite on the tiller...
JJ
Hi JJ,
bei mir war?s ein Torsionsbruch! Das Tip des zerst?rten Wurfarms drehte sich immer seitw?rts und der wurfarm selbst war in jeder Auszugsposition S-f?rmig (vom R?cken aus gesehen), im Gegensatz zum anderen.
Das r?hrte aus einem Bruch seitlich an der Verleimstelle des Kasan-inserts in die Ahornleiste, als ich das Horn aufleimte und die Schraubzwinge zu fest anzog. ich hab zwar versucht das zu reparieren, hat aber doch nicht so recht geklappt.
Beim 3. Aufspannen des Bogens in den vollen Auszug (73,5 cm) schaute ich auch nicht auf besagtes Tip und, wie auch bei dir, explodierte der Bogen f?rmlich. Er sprang an die Decke und schlug dort ein Loch!
For all: my bow had a defect in Kasan-Tip area from the wooden part. A torsion-break was the result.
Peter
bei mir war?s ein Torsionsbruch! Das Tip des zerst?rten Wurfarms drehte sich immer seitw?rts und der wurfarm selbst war in jeder Auszugsposition S-f?rmig (vom R?cken aus gesehen), im Gegensatz zum anderen.
Das r?hrte aus einem Bruch seitlich an der Verleimstelle des Kasan-inserts in die Ahornleiste, als ich das Horn aufleimte und die Schraubzwinge zu fest anzog. ich hab zwar versucht das zu reparieren, hat aber doch nicht so recht geklappt.
Beim 3. Aufspannen des Bogens in den vollen Auszug (73,5 cm) schaute ich auch nicht auf besagtes Tip und, wie auch bei dir, explodierte der Bogen f?rmlich. Er sprang an die Decke und schlug dort ein Loch!
For all: my bow had a defect in Kasan-Tip area from the wooden part. A torsion-break was the result.
Peter
Yes, the siyah had a slight lateral deviation, but it didn?t look dangerous at all... I?m not convinced that this was the cause of the failure.
Here?s the photo of how it looks like.
[external image]
Here?s the photo of how it looks like.
[external image]
![[external image]](http://i281.photobucket.com/albums/kk224/upo546/IMG_1454.jpg){kind=link}