(Based on Bernard Hunt's published BASIC program code)

Stiffness coefficient values:

less than 90 is poor 90 to 100 is average 110 is good 120 or better is excellent

Example:

Length = 18"

Width = .25"

Thickness = .125"

Weight = 1 gram

Load = 200 grams

Results:

Stiffness Coefficient = 104.61

Density = 6.76

Elastic Modulus = 24824807

Elastic Modulus(psi) = 353886

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Basic Formulas used:

Elastic modulus (gr per square cm) = .188*length^2*(buckleload-woodweight)/(width*thickness^3)

Density = 3.8*woodweight/(length*width*thickness)

Stiffness Coefficient = (elasticmodulus*2500)/(density*density*13000000)