Bingham pronounced longbow

[kennym]

Has anyone built a 45# ?  Have a fellow wanting to build one and I don't know if it takes .040 or .050 glass?

Have the stack but the glass will make some difference in weight result.

Also riser block size needed?

Thanks!
kenny

[derekdiruz]

Kenny, which one is this? I have a PILE of the bingham kit plans that some guy gave me, knowing I was building bows. off the top of my head, I know I have the one that's RD and 64" for certain.

[kennym]

They call it the pronounced TD longbow

I had a set of plans once but gave them away

I don’t know if the plans will say which glass

[Mad Max]

Bottom right
Doesn't give glass thickness
https://binghamprojects.com/learn-from-the-pros/bow-draw-weight/

[kennym]

Thanks, I have that sheet, but don't know which thickness of glass they used. Seems like they used a lot of .050 on longbows.

[Kirkll]

There is really no need to use .050 glass on any long bow unless its exceeding 70-80# . The added weight of the .050 kills the performance.  I built a few of those binham designs in the one piece version, and instantly altered the taper rates to .004, added power lams to push the fades out, and added in tip wedges. But after a few, i got rid of that form and altered the design completely.

Riser block size on a TD bow all depends on what type of grip shape is going to be used. I use 1.5" thickness on my one piece bows, but go with 1.75" on a TD  with both the glass and riser so i can customize the grip and use Recurve limbs on the same riser if wanted.

Its all adjustable....   Kirk

[kennym]

These guys have the form and templates so I'm just trying to hit weight first try .  A student is building the bow, so a success first time will be great.

I agree , I never use anything but .040 on mine and unless over 55# I never advise it.

I was thinking Binghams used .050 on a lot of their longbows is why I asked...

[Mad Max]

Call Binghams and ask

[Crooked Stic]

I Google and found the charts. It shows .290 for 45 is. If I remember those limbs had a Reverse taper. Making it parallel.

[kennym]

Binghams doesn't answer fone, says to order from website.

I found a guy who gave me his layup for the desired weight.  I have the charts, my main concern was what glass thickness to use on it...

Thanks all!!

[OldRawhide42]

Kenny I found the instructions and blue prints. It does not say how thick the glass is.

[kennym]

Think I have it covered, will try to report back when he gets doe and see how the .040 came out...

[Crooked Stic]

Leaving out .020 core for .050. Or adding .020 for .040 maybe 4 lbs. 

[Kirkll]

Leaving out .020 core for .050. Or adding .020 for .040 maybe 4 lbs. 

Typically glass has about .002 thickness  per pound ratio when reducing weight, so I’m thinking adding .020 in glass may bump the weight up a bit more than 4 pounds…. But I could be wrong.  I just don’t work with a lot of .050 glass.

Ha!  I say this as I get ready to lay up a couple sets of 90-110 pound limbs out of .050 glass.

[Crooked Stic]

Don't know why anybody needs 90-100 bow Hulkster maybe 

[Kirkll]

Don't know why anybody needs 90-100 bow Hulkster maybe 

I know a lot of guys that used to shoot heavy bows... Most of the guys i knew worked in construction and basically lifted weights for a living 40-50 hours a week. I was one of them. I've had several bows with 100# draw weights, but prefered the 80# range for hunting. I hunted with 80# until about age 55.

Do you really NEED that much draw weight?  Of course not. But breaking ribs on an elk doesn't happen at 45 -55#.  I've blown right through both sides of an elk with an 84# bow and took two ribs out doing it.

The guy in Germany i'm building heavy bows for now is in his late 30's and in his prime.....I remember those days....    Kirk