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Sneak peak.
Selfbowman:
Mark my cross section looks like Steve first cross section on the thread. The cross section kept the same ratio in diminishing mass .I trapped the bow before I started the tiller. Some fine adjustment on the traps after.
mmattockx:
--- Quote from: Selfbowman on January 02, 2023, 11:57:39 am ---Fade to mid limb.
--- End quote ---
Now that's interesting. The straight width taper pyramid profile will overstress the outer mid part of the limb (~2/3 of the way from fade to tip) if the thickness is kept constant as most people say to do with the pyramid shape. To maintain constant thickness from fade to tip the limb sides need to be curved out a bit from straight to keep the strain the same all along.
Did you want to go with the same 1-1/8" width out of the fades or try a bit wider this time?
Mark
avcase:
--- Quote from: Selfbowman on December 21, 2022, 06:56:08 pm ---Well the bow came in at 20.9 oz. 50@27 shot one arrow between 220-230 several times. Shot a 500 gr arrow 200 plus. It lost half of the reflex from fade to mid limb in set. Good bow. May need to do a stretch test on this bow.
--- End quote ---
Hello Arvin,
I just read through the 8+ pages of this bow build and have some questions. According to the statement above, you initially shot a 10 ggp arrow over 200 fps with the bow drawn 27”? The 27” draw is measured from the bow back or belly? Next, you narrowed the tips some amount, the bow started taking some set and then the speed dropped to 169 fps with a 497 grain arrow. This is drawn the same 27”? Do I have this right?
Was the draw weight with the 169 fps shot less than with the 50# draw weight measured for the initial 200+ fps shot? Of course, draw weight changes will effectively change the grains per pound for the 169 fps shot compared to the initial shot. Thanks!
Alan
Selfbowman:
Alan the bow never shot 200fps! It shot 500 grain over 200 yds. The arrow that shot 220 -230 several time’s weighed 460 gr. When I took more mass off the ends it did not do as good at 28” the set killed the bow. I always measure to the back of the bow.
avcase:
Thanks Arvin. I misunderstood that you were talking about yards, not feet per second! Ha!
Alan
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