Return-Path: Received: from slkcpop3.slkc.uswest.net ([206.81.128.3]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with SMTP id com for ; Sun, 3 Oct 1999 09:46:58 -0400 Received: (qmail 19318 invoked by alias); 3 Oct 1999 13:50:57 -0000 Received: (qmail 19311 invoked by uid 0); 3 Oct 1999 13:50:56 -0000 Received: from pppdsla7.slkc.uswest.net (HELO scottdah) (216.160.232.7) by slkcpop3.slkc.uswest.net with SMTP; 3 Oct 1999 13:50:56 -0000 Delivered-To: fixup-lancair.list@olsusa.com@fixme From: "Scott Dahlgren" To: "___Lancair list" Subject: holes in spar Date: Sun, 3 Oct 1999 07:52:34 -0600 Message-ID: <001301bf0da6$8b537d20$0200000a@scottdah> Importance: Normal X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Dan Schaefer has a good point on drilling holes in the spar web. It's something to be done with a lot of examination (if done). To minimize problems, make sure to drill your hole(s) in the center of the web, away from the spar caps (Cutting the spar cap = death). You could probably taper reinforce the area around the hole with tapered 45° layups to get some of your shear strength back. It might be a good idea to contact a professional composite/aircraft engineering to have a look at all the variables and it should cost very little. (2nd member of the certified chickens) Scott Dahlgren >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html