Return-Path: Received: from dub-img-9.compuserve.com ([149.174.206.139]) by truman.olsusa.com (Post.Office MTA v3.1.2 release (PO203-101c) ID# 0-44819U2500L250S0) with ESMTP id AAA4925 for ; Sat, 26 Sep 1998 14:02:17 -0400 Received: (from root@localhost) by dub-img-9.compuserve.com (8.8.6/8.8.6/2.14) id OAA05119 for lancair.list@olsusa.com; Sat, 26 Sep 1998 14:02:14 -0400 (EDT) Date: Sat, 26 Sep 1998 14:01:37 -0400 From: Guy Buchanan Subject: Carbon vs. Glass Sender: Guy Buchanan To: Blind.Copy.Receiver@compuserve.com Message-ID: <199809261402_MC2-5AC0-6D2A@compuserve.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Disposition: inline X-Mailing-List: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> All, Error in my last post. "Spruce perp. to grain" should have read "Spruce parallel to grain." Sorry for the confusion. Scott, your responses are on the mark, but I think you slipped some zeros in your epoxy modulus. I get a range closer to 500,000 psi. That would make your epoxy stress be only 1800 psi so your example still holds true. Also, I hope noone ever reinforces with purely unidirectional carbon. It has great stiffness but lousy strength. Guy Buchanan Buchanan & Newcomer