I recently built a hybrid long bow for my brother and after 60 shots it blew up. I didn't get pictures to help me diagnose why yet. I was very confident on it. The glue lines looked great and it was around the tenth bow off of that form. I did clean the laminations with 91 percent isopropyl alcohol prior to gluing. Is there something in this that could cause a delamination?

I use NO chemicals on the wood. I do clean the glass with acetone.

Did the bow separate at the glue joints or did it shear the wood lams?

Not saying that this is the cause but 91% means 9% water... Did you use alcohol on the wood lams?? I would like to see pics of the bow, strung, unstrung and at full draw... Close-ups of fade area and break area...

This is the only picture I have so far

That does not look like a glue line failure. More like the wood grain sheared at the fulcrum created by the riser. Did you use highly figured wood lams?

No very straight grained ash lams

OK then, I'm out.

Ha yeah I am stumped too

Welllll...  That's standard failure area...  Waiting for more pics...

Just my SWAG but I think the glue joint failed on the face side of the riser.

Yep looks like the glass lifted there at the front of the sight window.

Quote from: monterey on July 25, 2019, 02:41:53 PM
Just my SWAG but I think the glue joint failed on the face side of the riser.

x2 at the end of the fade

but looking again at the picture the glass lifted at the arrow rest and sight window. yes?

My brother lives in Montana and I'm in Michigan. I'll ask for more pictures

Here are more pictures

but looking again at the picture the glass lifted at the arrow rest and sight window. yes?

Not sure! I only have the pictures to go off too

From what I can tell on my little phone screen......there are two wood lams on the back side and those two lams is where the separation started. I can't see any tear out on the lam that is still on the riser.

Bvas that's what I see too. Maybe a dry glue joint?

What was the core? Hickory?