delamanated limbs ok but three sets???

Covey · February 05, 2012, 07:52:00 PM

118 degrees... WOW! That and your 31.5"draw probably had alot to do with the delam. How long was they strung in that kind of heat? If they was in the heat for a period of time and drawing them to that length???

That would be my guess! Jason

atatarpm · February 05, 2012, 07:59:00 PM

Cyred4d no sir they are both still very carefully watched over as I hope to have new limbs made for them.
JimB that seams to be the consenceous I am planning a BW later this year and I don't want the samething happening to it.
Trad in cali sorry about the timing but this took place in Aug.of last year. Although you did bring a big smile to my face and a loud laugh. Thank you sir for your wit.

sticksnstones · February 05, 2012, 07:59:00 PM

QuoteOriginally posted by Covey:
118 degrees... WOW! That and your 31.5"draw probably had alot to do with the delam. How long was they strung in that kind of heat? If they was in the heat for a period of time and drawing them to that length???

That would be my guess! Jason

I'm thinking the same things. These weren't in your car the hours before and hours in between these events were they?

I've shot a few times at 110+ and I draw 31.5, no bow problems yet but I'm very careful with mine at those temps. A good 60" recurve should be fine at that draw, and the 66" should be great. I don't think that should be a problem.
Thom

atatarpm · February 05, 2012, 08:04:00 PM

Covey and Sticksnstones. All three about 20 minutes each

LongStick64 · February 05, 2012, 08:10:00 PM

118 would make me delaminate, phew that's hot, I would think even storing a bow in that heat would cause it.

atatarpm · February 05, 2012, 08:10:00 PM

Inside the house was 70 degrees and going out side would make it a 48 degee change. A very interesting thought.

Jake Fr · February 05, 2012, 08:16:00 PM

This is just my thought but whas it strung before hand in the heat and did you use a stringer or not cause that hot and not using a stringer and using your foot or behind ur leg coult twist it not knowing it has happened and made a crack in limb while hot then when shot it delamed just a thought

February 05, 2012, 08:17:00 PM

If this happened to 3 different limbs on 2 different bows that were built in a 4 year span, I would have to accredit it to exposure to the high heat. I shot my bow in the heat all last summer but never left it strung when not being shot and nearly never left in in my vehicle....even unstrung!

Bisch

atatarpm · February 05, 2012, 08:32:00 PM

Jake Fr great thought sir and I always use a stringer.
Bisch the bows always stay in the A/C .
The thing you all have brought up that I had not thought about is that I put togeather the bows in the house in 70 degree temps and then walked out into a 48 degree temp. change without giving them any time to adjust just started shooting.

Sixby · February 05, 2012, 09:15:00 PM

Are they glass or carbon limbs? Also how do you string your bows. If you shoot three under and the bow is not tillered for it that could cause more pressure on the bottom limb and do it but that is unlikely. to delaminate on the bottom and one side only suggests that the bow is being twisted somehow. Do you have a quiver that you are putting on the limbs?
Just some thoughts, God bless you, steve

atatarpm · February 05, 2012, 10:05:00 PM

Sixby they are glass and they are bare nothing on them both are tillered split and I shoot split. I also was wondering about possable torque on the string as to why they all three did that on the same side. I know that a recurve is more subject to string torque then a long bow and none of my long bows have shown any signs of this problem.

Bjorn · February 05, 2012, 11:55:00 PM

There is nothing shooting related that you could have done even with your draw-nothing short of a dry fire. I am also inclined to discount the 45 degree theory, sounds like glue failure to me.
You have mentioned the string torquing a coupla' times-can't see that affecting the failure at all.

mmgrode · February 06, 2012, 12:51:00 AM

Richard,
were these bows used before you bought them? Three different limbs from two different bowyers seems to suggest something other than materials and workmanship.
Most bows are not built for a 31.5" draw...significantly more stress than a 28" draw! The overbearing stress, mixed with the heat, could cause delamination.

Were these bows built to a 28" draw length?

atatarpm · February 06, 2012, 06:46:00 AM

No Matt, the 66" was bought used and it was built to a 29" dl. The 60" inch was built to 28" and it was ordered in person in his shop where dl. was talked about and was told the bow would take it quite well.
Bjorn I would love to say glue failure, but I am having a hard time with three of them in less the.n an hour

Ray Lyon · February 06, 2012, 07:59:00 AM

Hmmm, If same bowyer you could say perhaps glue. But with 3 different bows I'd say it's a combination of heat, change in temperature and draw length all combined. 31.5 is a lot of stress on a bow limb.

Danny Rowan · February 06, 2012, 08:40:00 AM

Did you lay the bows in the sunlight in that heat? If so I would bet the heat did it. Laying in direct sunlight in that heat strung could very well cause the failure. In the shade, doubtful but 118 is very hot.

LongStick64 · February 06, 2012, 08:46:00 AM

How are the limbs connected to the riser, one pin or two or by two bolts ?

wingnut · February 06, 2012, 09:05:00 AM

Sounds like they cooked off. 118 degrees in direct sun can easily go much higher. Epoxy has a temp that it will soften and then stuff happens. A few years back we were at the shoot in McAlester OK and it was HOT! Our display tent was in the shade but another bowyer had his in the open. The sun dipped down and put recurves strung in the direct sunlight. I heard the bow go from 50 yds away. I saw four bows that did the same thing that day being left strung in trucks. Epoxy does not like heat.

I'm real surprised that after the second one let loose you kept at it.

Mike

Austin · February 06, 2012, 10:11:00 AM

My guess is that it was heat. Extreme draw may have exacerbated the situation. Not saying there's anything wrong with your draw length, just seems logical that the longer the bow is drawn the more force and flex on the limbs. Did the bows spend any time in a hot car?

SERGIO VENNERI · February 06, 2012, 11:14:00 AM

I also say excessive heat at the same time or place!