Help with making a hill style longbow

[Djoseph]

Guys does that mean the wood stack should be about .32 to .33" when using the .04 glass that I have
For a straight laid bow?
Thanks for your help.
Dan

[bigbob2]

No!. the stacks given are wood [.40 etc,]only plus 2 x .040 glass

[Djoseph]

Thanks Bob that's clear now.....
So if I go with your plan the lay out would be as follows
.04 glass
4 × .100 lams tapered .001"/in each
16" riser
.04 glass
66" ntn, 1-1/8" at fades tapering to 1/2" at nocks
Without tip wedges.
Should I make the btm limb 1" shorter or keep both limbs the same length?
Thanks for your help
Dan

[monterey]

The stacks I suggested were total and include the glass.

[Djoseph]

Hello Monterey, got your internet running again? I certainly hope so!
So the stack you gave includes the .04 glass too..ok
But that's for 1.25" width at fades, for 1-1/8" what will the stack be for straight and 3/4" reflexed?
Thanks for your patience, after clarifying this I should be able to decide what measurements I would like to go with...
Dan

[bigbob2]

i suggest go with monterey. my notes say .390 stack [wood only]  of 3 x .001 tapers plus one parallel using  given measurements of bow, would give 55# @ 28'' and 66 ntn This is straight laid only.

[Djoseph]

Bob I apologise for my confusion but I don't understand what you mean by

 " my notes say .390 stack [wood only] of 3 x .001 tapers plus one parallel using given measurements of bow, would give 55# @ 28'' and 66 ntn This is straight laid only."

 Are you saying that for 1.25" fades to 1/2" nocks straight laid bow with 16" riser the wood stack is .390" and using .003"/ inch taper?

Please clarify this for me....thanks for your patience with my questions....
Dan

[monterey]

Ok, I have got all my tools up and running and done some final calculations.

Here is what I come up with:

All 66" NTN
16" riser
these are total stack including glass measured at the thickest (butt) end of the laminations.

55# bow with reflex at 1.25 inch wide = total stack of .425

55# bow flat at 1.25 inch wide = total stack of .438

55# bow reflex at 1.125 inch wide = total stack of .438

55# bow flat at 1.125 inch wide = total stack of .451

To make any of the above a 50# bow, reduce the applicable stack by .014

While Bob's numbers differ somewhat from mine, don't discount them entirely.  Think it through.

As you can see by the .014 figure to reduce 5# of weight, it does not take very much to effect the strength of the limb.

Choice of wood cores may have some effect but contrary to the anecdotal observations of many archers and even bowyers, I don't think you will find much difference in the draw weights of various woods.  Heavier core woods may result in slightly slower shooting bows, but not by very much.  

What is your source of instructions on the actual build?

[Djoseph]

Hello Monterey thank you very much for your valuable input and time. It's nice that you sorted out your com and internet problems..,
I don't discount Bigbobs input it's just that I was confused a bit by his reply between the stack for the different widths and between flat and reflexed but now you have answered me in a very clear fashion
Thanks once again....
I have been looking at some build alongs here and I got to go on that....any advice you give me is most welcome.
The specs you gave I assume from your previous reply is for .003"/in right?
Dan

[monterey]

Yes, .003 taper.

Don't be surprised if you come up a bit off these predicted weights, but it shouldn't be too far off.

[Djoseph]

Thanks Monterey, I'll give this some thought before I commit to building either to your or Bob's specs.
After that I want to build a mild deflex/reflex bow with my .03 glass about 35 to 40#@28" will do.
Regards, Dan.