Just Wrong?
I tried using this App for wood beams. But deflection is just wrong. Lodgepole pine round beam 12 inch diameter, 144 inch span (12 foot); 1400 pounds per foot uniform, says total deflection is 0.04 inches -- four hundredths of one inch. Yikes -- off by several orders of magnitude.
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Beams, Deflection, Bending, Stress Calculator