Need info: lam thickness for 56 or 58" youth longbow w/ .040 glass to hit 20lbs @ 24"

[insttech1]

Straight D-shaped, dacron only, simple glue-up...just need to know lam thickness...can't find the calculator for Binghams' stuff for their youth bows...just the adult ones...

I made a really pretty bubinga youth longbow for my cousin's son...which was promptly broken by their neighbor by pulling it too far...so I am making one with two pieces of clear glass.

I have .040 glass on hand, and some 1/8" thick lams of red oak and ash...which suck, I know, but I'm out of bubinga and hard rock maple now...I just don't know if those lams are too thick.

So what thickness do I need to hit 20lbs at 24"?
I can make this bow to be 58" down to about 54" with no problems...I'd like to keep it 56" NTN.

Thanks for the info!!
Marc

[Benoli]

I'd be very interested in this as well. I just received the Bingham instructional tape and plans for a youth longbow but it does not include a chart for calculating weight. I will be calling to see if they have one handy. I'll pass on any info I get. Here is a good build along that may help:  http://tradgang.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=051817

[insttech1]

Thanks for the info; I'll keep looking too.

[**DONOTDELETE**]

You've asked a question with a whole lot of variables here....Even the Bingham projects tables are not very reliable, and subject to very little variation in limb width, length, and shape....

PM sent....Kirk

[insttech1]

Kirk,
I didn't see a PM yet...

To clarify, if someone gives me the number from the Binghams chart, for the youth 56" longbow, 1.25" wide, I can extrapolate pretty much everything else.

I have the Bingham blueprint, so can match the riser length, limb widths/tapers, and fades to get the correct formula.

Thanks much,
Marc

[insttech1]

ttt

[**DONOTDELETE**]

OOOOOPS!      PM really sent this time....Kirk