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AVCase design Arvin bow build

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willie:

--- Quote ---The missing 5# you are trying to account for is on his shop floor.
--- End quote ---

lol, but dont most bowyers find that some woods "loose more poundage" than others when tillering, even without taking visible set due to the compaction or hidden set that happens as wood is worked at stresses near the max?

I don't expect this behavior to be well quantified in typical wood strength of materiels studies, as wood is almost always used at much lower stresses. Even airplane fuselages and sailboat masts have higher saftey factors in their designs than most bows, let alone bows for flight shooting. 

avcase:
For those who are curious, here are the correct osage material properties, based on the average of a number of samples I measured a couple of years ago.

Elastic modulus (bending): 1.87 Mpsi
Bending stress at “yield”: 15000 psi. This is approximately the point where higher bending stresses produced some noticeable set.  Strain at this point is about 0.79%.
Ultimate stress at failure: 20000 psi
Density: 50.5 lb/ft^3

Alan

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