Disclaimer: I am a wood hack at best, without a notebook of thickness info for bow designs.
But, I have started one, with the first being the T/D recurves. I have made a few Bingham's T/D recurves and have a working knowledge of how changes made to the riser length, wedges and limb length/width changes the out come of the bow. I do have all of the Bingham's plans with their lam thickness recipes for success, but I would like to hear from everyone that has made the Bingham's pronounced T/D longbow. When you recieved your limb package from Binghams, what were the total thickness of the glass, parallels and tapers, as a whole and individually. Also the wedge length in each design. I am courious to learn the thickness for all of the Prononunced T/d longbow models, 64',66'.and 68'.
I am at the stage in my building, where I want to start experimenting. I could jump in with both feet and start swinging for the fence, but I'd like a good jumping off point.
***Also, I came into some clear E-glass at .060, is there a particular style limb/bow design the .060 glass is used with, or would you thickness sand it down to a thinner thickness and use it?
Thanks all for reading and replying,
Kevin Breaux
Edit: changed thickness planed to thickness sand
Thanks Kenny
I've only been in on one of those,so can't help you much there,but most bowyers keep glass at 20 to 25% of total stack.
.060 glass sounds mighty thick for most bows,keep in mind glass is stiffer per thickness than wood.
I don't think a planer will work for thinning glass,will probably splinter it.
JMHO
If you use the same lay up of reverse tapered lams and the wedge they recommend Binghams charts are very close in # for their design.
Been making my own lams for years and use a different combination of taper than binghams. Didn't keep good records back in the days I used their lams so I can't help you there.
If memory serves me correctly binghams design will increase 7# for each decrease of 2" of bow lenght using the same stack height.
You can call and ask they will be more than happy to help you with your ? on their designs.
I'd grind the glass down.
I have done two take down longbows, with the pronounced R/D, one a 38# 68" and a 43# 68", both had reverse tapers with 8 1/4" wedges, the first was .265 and the second .282 measured on the thick end 1 inch in. Hope it helps
Good Luck
Mike
Could you look this over and suggest changes as your experience dictates, thanks. The bow I am shooting for, is from the Binghams (bow form) for Take/Down 68" Pronounced Longbow, Reflex/deflex. As per Binghams recipe, a Pronounced T/D 68" longbows stack measured w/o wedge calls for .305 for 50#s @ 68"
1.) I do know this stack calls for a 8.25 length wedge, but I am unsure of the thickness, would 3/8ths be a good starting point?
2.) What is the percentage difference from parallel to tapers, (normally?)
I am making all the lams and wedges, this is what I have so far:
This is for a 32" lam stack
Glass .040 .040
Taper .124 .060
Parallel .041 .041
ReverseTaper .060 .124
Glass .040 .040
.305 .305
1.) 3/8 is the thickness of the binghams wedge
2.) IMO it makes no difference % wise as long as the total taper(in this case parallel) is reached. When glued together the lams act as a unit.
Good luck and keep us posted.........
Still grinding