BBO like to share...........but then Ka-Boom!

[RT]

Hi all,

I have recently come on board PA and would like to share with all my lastest bow, The specs are 56.5 NTN tiller to 24" at 64lbs "D" bow. This bow is made up of two raw boo lams, pre-tapered then glued up. Tillering is done from the sides and trapping at 45 degree on limbs.

The bow has made it to final tiller at 24" but when I was "shooting in" the bow , I heard a tick at 3/4 draw, stop right there and checked the bow. Did not see any visable damange, then next drawn to full draw and Ka-Boom! it broke. Lucky there was no injury..........

I guess one of the node has lifted and that how it affected the other limb and broke.

Well, the pics will tell the story. Any comment and suggestion welcome. RT

[RT]

Bow in the glue up form

[attachment deleted by admin]

[Pappy]

Welcome a board,can't wait to see it when it is finished.
   Pappy

[RT]

Sorry guys you will have to go to the append link to see more pics of the broken bow as I keep getting error message that i can upload too big a file and i dont know how to reduce them.

http://s43.photobucket.com/albums/e356/robt188/Broken%20Boo%20bow/

[Ryano]

looks to me like you took the nodes down to far......to bad it looked pretty good.

[tom sawyer]

It was a pretty bow.  My first thought was that node looked a little rotten, it is dark brown right in that area.

[Pappy]

Well it was looking good.Sorry about your luck.
   Pappy

[Hillbilly]

Bummer, that was shaping up to be a nice one. It's harder to get away with little flaws in the backing or stave on a bow that short, too.

[Justin Snyder]

Beautiful tip overlays.  What a bummer. I'm with Lennie, I think it was bad boo. It lifted right before the node not on it.  Justin

[Marc St Louis]

Looks like it de-laminated and that might be the real cause of the Bamboo splintering, that and you may have smoothed the nodes down too much.

[Badger]

      Looks to me like the node was taken down too far also, I just clean mine up but leave them basicaly undisturbed. If you nock the tip off the top of the node that can be enough to cause a failure, Steve

[OldBow]

Sorry guys you will have to go to the append link to see more pics of the broken bow as I keep getting error message that i can upload too big a file and i dont know how to reduce them.

http://s43.photobucket.com/albums/e356/robt188/Broken%20Boo%20bow/

You will have a photoeditor on your computer, probably under program files.  It will resize the image you need.  Best is to use 640x480 pixels per inch at a resolution of 72 although you might try 150.

[Rich Saffold]

Bummer RT, These things happen, and it's a good thing bamboo is either free or cheap..Your bow on the "shelf" thread, and I think you had entered in  the contest is very cool looking, and I am getting ready to prep some bamboo to make a similar one, probably longer..

Rich-popped a node or two

[RT]

Thanks for all the feed back guys, I do agree with Hillbilly that with shorter bows, it is harder to get away with flaws........

Second thing that came into my mind is that for the belly of this bow, I used the boo that is closer to the ground thus thicker and i used the thiner boo higher up from the ground(say 20 feet upwards)............

I harvest my own boo that is 5 to 6 inches in diameter, after you split the boo, the boo closer to the ground is 3/4 to a 1" thick(back of boo to belly) but the boo that is higher up is thiner after spliting , say between 1/2 to 1/4". I suspectthis may be another cause for the node lifting.   

having said that , i have built many lighter bows say 45lbs and below that didnt have this problem, this is my 1st heavy boo bow above 60lbs.

Well back to the drawing board and start planning again, cheers!     RT