Author Topic: Limb failure  (Read 498 times)


Offline pditto613

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Re: Limb failure
« Reply #1 on: June 26, 2019, 05:43:47 PM »
Sorry, pics posted out of order. First and third are the same break.   Second is the failure I forced
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Offline Buemaker

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Re: Limb failure
« Reply #2 on: June 26, 2019, 05:50:03 PM »
If you go about one inch and two inches in from the tip of the fade out it looks far to thick I think.

Online Crooked Stic

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Re: Limb failure
« Reply #3 on: June 26, 2019, 08:23:37 PM »
Yeah fades look thick. 48 seems short for even 24 in. unless the riser is short.
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Online Mad Max

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Re: Limb failure
« Reply #4 on: June 26, 2019, 10:43:49 PM »
This 50" one can be drawn to 30"
Fades need to be longer.
Who's design ?
any pictures braced, unbraced?
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Online Crooked Stic

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Re: Limb failure
« Reply #5 on: June 27, 2019, 06:51:18 AM »
Design csn determine how far a bow can be drawn. This one seems to have a problem in design or build.
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Offline pditto613

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Re: Limb failure
« Reply #6 on: June 27, 2019, 08:52:15 AM »
The bow is my design.  Youth longbow, shallow r/d, 12” riser.   Every consideration is given to make lay up and build simple and quick.   The goal is to keep labor low to get a sale price low as possible. But not at the cost of safety.   I would like to have seen it draw further before failure, but for a bow this short 28” isn’t bad.   Thinning and extending the fades is good advice.  But what really concerns me is how clean that one break is.  Has anyone seen that before? Cause?
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Online Mad Max

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Re: Limb failure
« Reply #7 on: June 27, 2019, 09:23:20 AM »
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Online Crooked Stic

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Re: Limb failure
« Reply #8 on: June 27, 2019, 10:15:18 AM »
Most times .250 2 in. back will work and thinner dont hurt.
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Online jess stuart

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Re: Limb failure
« Reply #9 on: June 27, 2019, 11:30:30 AM »
I would agree fades need to be thinner.  I always try to be less tha .250 three inches in.  Thats hard to do on a 12" riser.  There is more room than you think, the kids have small hands.  I struggle with not making the grip area to large thus robbing from the fade out area. 
If the fades are to thick it concentrates all the pressure in a small area, a recipe for failure.  Believe me I have had the same thing happen.  It is probably impossible to make your fades to thin and flexible.  At least that is my thinking

Online bigbob2

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Re: Limb failure
« Reply #10 on: June 27, 2019, 08:30:33 PM »
my first FhLB did almost the same clean break across glass and stack near fades. I believe it had a similar problem, fades just a little too abrupt away from end. Made the second with more progressive taper and has had hundreds of shots with zero problems. It is a very high stress area at end of fades and and anomaly will soon show up.

Online Forwardhandle

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Re: Limb failure
« Reply #11 on: June 29, 2019, 06:12:47 AM »
I had one limb failure and it made me rethink my riser tapers I now keep a smooth taper back in the riser to the point where the lams and glass keep it from flexing seems to work good for me I think by doing the thinner longer tapers it probably acts performance wise as a shorter riser giving a little bit more working limb all guessing on my part !

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Online Crooked Stic

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Re: Limb failure
« Reply #12 on: June 29, 2019, 09:17:07 AM »
Although Ihave a top name longbow here 58 in. With a max draw of 33 in. And the fades are not thin at all. But riser is short.

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« Last Edit: June 29, 2019, 06:29:33 PM by Crooked Stic »
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Online Forwardhandle

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Re: Limb failure
« Reply #13 on: June 29, 2019, 09:26:20 AM »
Its weird Mike some designs work with almost non smallish fades & some will blow I think carbon limbed ones help to ,maybe thicker PL on some to ,who knows but I know Kennys FH likes the elongated fades , interesting topic !
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Online Roy from Pa

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Re: Limb failure
« Reply #14 on: June 29, 2019, 09:59:48 AM »
Quote
Although Ihave a top name lingbow here 58 in.

Who makes the lingbow?

Never heard of it.

Online Forwardhandle

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Re: Limb failure
« Reply #15 on: June 29, 2019, 11:52:03 AM »
Mike you got a pic of the lingbow fades ? :biglaugh:
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Online kennym

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Re: Limb failure
« Reply #16 on: June 29, 2019, 01:13:46 PM »
Quote
Although Ihave a top name lingbow here 58 in.

Who makes the lingbow?

Never heard of it.

Prob from China.  Hop Sing make lingbow … :)
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Online Forwardhandle

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Re: Limb failure
« Reply #17 on: June 29, 2019, 01:25:01 PM »
 :goldtooth:
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Online Mad Max

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Re: Limb failure
« Reply #18 on: June 29, 2019, 01:27:50 PM »
Limb taper, width and thickness have a lot to do with how much the fades need to work.
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Online kennym

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Re: Limb failure
« Reply #19 on: June 29, 2019, 01:47:32 PM »
Limb taper, width and thickness have a lot to do with how much the fades need to work.

Yup and I’d add length to that list
Stay sharp, Kenny.

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