This is a multi-part message in MIME format. ---------------------- multipart/related attachment ------=_NextPart_001_03C4_01C388CD.E386A070 ----- Original Message -----=20 From: "Richard Brekne" <Richard.Brekne@grieg.uib.no> To: "Pianotech" <pianotech@ptg.org> Sent: October 02, 2003 8:33 AM Subject: Re: RC vs CC again >=20 > All of this suggests to me that in general, a CC board has an easier > time generating a higher stiffness to mass ratio...as long as the > compression in the panel holds. Yes ? >=20 > RicB=20 -------------------------------------------------------------------------= ------- No. Remember the stiffness of the ribs increases directly with its width but = with the cube of its height: y =3D deflection of beam (measured at center) K =3D a constant (0.25 for a center-loaded beam) P =3D load on beam (at center) E =3D modulus of elasticity (1.57 x 106 for Sitka spruce) l =3D length of beam b =3D width of beam d =3D 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 ------=_NextPart_001_03C4_01C388CD.E386A070 An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/1f/72/eb/f0/attachment.htm ------=_NextPart_001_03C4_01C388CD.E386A070-- ---------------------- multipart/related attachment A non-text attachment was scrubbed... Name: not available Type: image/gif Size: 552 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/4d/bb/5a/d4/attachment.gif ---------------------- multipart/related attachment--
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