---------------------- multipart/alternative attachment Delwin D Fandrich wrote: > Remember the stiffness of the ribs increases directly with its width > but with the cube of its height: > [Image] > > > > Just one more question on this.... how do you figure P when the load > is not at the center ?... > > > y = deflection of beam (measured at center) > K = a constant (0.25 for a center-loaded beam) > > P = load on beam (at center) > > E = modulus of elasticity (1.57 x 106 for Sitka spruce) > > l = length of beam > > b = width of beam > > d = depth of beam ... and we get to manipulate both the height and the > width of the rib. I can make that rib enormously stiff before I run > into mass problems. Del -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html http://www.hf.uib.no/grieg/personer/cv_RB.html ---------------------- multipart/alternative attachment --------------38E09619C16DA0A7DDB834ED An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b1/56/5c/10/attachment.htm --------------38E09619C16DA0A7DDB834ED A non-text attachment was scrubbed... Name: clip_image002.gif Type: image/gif Size: 551 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/e5/8a/e3/f5/clip_image002.gif --------------38E09619C16DA0A7DDB834ED-- ---------------------- multipart/alternative attachment--
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