Main Discussion Area > Flight Bows
Arvins 62" osage design
mmattockx:
--- Quote from: willie on December 28, 2024, 02:13:02 pm ---this crown is gotta be accounted for some how and I have got an idea, although it might take a couple of days and be after the new year.
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--- Quote from: Selfbowman on December 28, 2024, 06:08:34 pm ---Here is a end drop off the stave.
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Willie, that is easily dealt with in autocad using the section properties calculator.
Arvin, assuming you are using the outer surface as the back I need to know how wide it is at the outer ring and how much crown there is. Measure crown by putting a straight edge across the outside edges of that outer ring and then measure to the highest part of the curve.
Mark
willie:
--- Quote from: mmattockx on December 28, 2024, 09:20:52 pm ---
Willie, that is easily dealt with in autocad using the section properties calculator.
Arvin, assuming you are using the outer surface as the back I need to know how wide it is at the outer ring and how much crown there is. Measure crown by putting a straight edge across the outside edges of that outer ring and then measure to the highest part of the curve.
Mark
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Hi Mark,
if you dont mind trying the calculator in autocad that would be nice.
The limb crossection at the fade the time looks like a segment of a circle who's radius is 3.5" on top of a rectangle, both elements being 2.6" wide. (my sketch here shows the heigth of the segment to be about .28" and the "equivelent' rectangular section from Virtualbow is 2.6" wide by .42" thick, but that thickness is still tentative and may not work further down the limb as there is a gentle thickness taper in spite of the bow being a pryamid back, thus It would be interesting to see if that composite section can be compressed in the vertical direction without the radius of gyration changing.
willie:
Arvin, heres what we got so far. Comments from others are welcome
willie:
more...
hmm the projected arrow velocity with 190gr arrow seems low. Should we look to tweak it up, Arvin?
Bob Barnes:
--- Quote from: willie on December 28, 2024, 11:38:51 pm ---Arvin, heres what we got so far. Comments from others are welcome
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so you went from carrying the 2.6" to 35% of the limb length to a Pyramid? Is it more efficient?
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