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Hazel longbow, 100# @ 28"

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WillS:
I think you might be surprised.  Reflex of any kind bumps the weight significantly, especially at the very beginning.  If you were confident enough to brace it at full height and draw to 25" immediately you'd see just how heavy this bow could be, but by the time you've got your eye in, worked on the tiller, missed a few minor hinges, caught them too late etc etc, that reflex will be gone, the weight will be dropping and you'll end up somewhere sensible.

You still need to get a rough estimate of weight so everybody knows what you're actually dealing with, otherwise all we can offer is supposition and guesswork.  It could be a 70lb bow or a 140lb at this point, and your approach will change dramatically depending on the answer.

I can't remember now what dimensions Joe used, but it wasn't that big.  Possibly just over 30mm deep.  It's more about how you make a bow though really.  Two people could start with the exact same stave, exact same dimensions and end up with completely different bows based on how often the bow is drawn on the tiller, how slow the process is, how well they treat the bow etc. 

FilipT:
I pulled the bow on tiller so that the tips touched bracing line and the scale says this is around 100#. Does that mean that bow will be 100# at full draw with short string? I think I read something like that before.

Also, did a read about spectra power pro and the result is mixed opinions. A lot of people say that it stretches too much and some people say it doesn't at all. I just love contradictory opinions.

P.S.
I have already pre made FF string for 70" bows but it's endless with thin padded loops. If I were to use this, this would have slightly bigger brace height than usual as string is 66,5" long and not 67" but I could finish the tillering. On the other hand I worry that nocks will snap during tillering. I wouldn't shoot the bow with it though.
Use it or not use it???

Del the cat:

--- Quote from: FilipT on November 23, 2017, 07:03:04 am ---I pulled the bow on tiller so that the tips touched bracing line and the scale says this is around 100#. Does that mean that bow will be 100# at full draw with short string? I think I read something like that before.


--- End quote ---
No!
Just to clarify and reinforce what Badger said about the long string.
If the long string just dangles down about 6" or less it will pull to the same weight and length as when braced.
IF it is a VERY long string (say dangling down a foot) it won't read right.
I recently checked this on the last warbow I made (120#)
So get a string that will just slip on to the bow. Pull it to your target draw weight and read off the draw length, that will agree pretty closely to the draw length when braced.
Del

FilipT:
Ah, ok, I pulled with string that lay against the belly. I will pull again to the 90# and see where it it shows as draw length. I am not completely sure but I think it was about 20" where it showed about 90#.

By doing math it seems that at the 28" bow will be 141# or have I calculated wrong???
90# @ 20"
20" - brace height (6") = 14"
that means 90# @ 14" -> 90# / 14 = 6,43
28" (full draw) - 20" = 8"; 8" * 6,43 = 51,4#
-------------------------
51,4# + 90# = 141,4#

JNystrom:
Yep, it was excactly that. Try spiderwire, if you don't have anything else. Not that spiderwire is any bad, its just slippery. I have shot all my flight shoots with spiderwire and really heavy tension at brace. 80 pound 50" shorties and such.

About the poundage, just go ahead and thin the bow a lot. There is still heat treating to be done....

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