Return-Path: Received: from imo-r17.mx.aol.com ([152.163.225.71]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Fri, 11 Aug 2000 17:55:55 -0400 Received: from RWolf99@aol.com by imo-r17.mx.aol.com (mail_out_v27.12.) id k.b9.5cc437d (4396) for ; Fri, 11 Aug 2000 18:02:17 -0400 (EDT) From: RWolf99@aol.com Message-ID: Date: Fri, 11 Aug 2000 18:02:16 EDT Subject: LNC2 Seat Pan Forward Lip To: lancair.list@olsusa.com X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> I just laid up the "3-BID lip" holding the forward edge of the seat pans to the forward spar on my 360. I use the term in quotes because I did it a little differently than the manual, in an attempt to forestall the peel failures experienced by Ric Argente and others. The manual calls for a 3-BID layup from the forward face of the forward spar, over a foam-and-micro spacer/adapter, proceeding aft onto the seat pan itself (which is covered with release tape). The failure modes experienced by at least two people are debonding of the 3-BID from the forward face of the spar, presumably in a peeling failure. Repair is reportedly simple and efective by bonding the lip back in place with Hysol. To preclude this failure mode, I used a pair of 2-BID layups done at the same time and co-cured. With the spacer/adapter in place (per the manual, except I used prepreg instead of foam) and the micro fully cured and sanded, I made a 2-2.5 inch 2-BID which went on top of the spacer, but under the seat pan for about 1 inch, and laid the pan in place. The part of the 2-BID that extended forward was then folded back atop the seat pan, forming a pocket for the seat pan. While still wet, I laid a wider 2-BID from the forward face of the spar up onto the micro and aft onto the seat pan, covering the 2-BID just applied. I brushed a little liquid epoxy into the "crotch" where the 2-BIDs meet in hopes of minimizing air bubbles. The end result is a 4-BID lip, with the 2 inner plies tucking under the seat pan and the 2 outer plies running down onto the forward face of the spar. This should prevent the peel failure mode. I'll let you know how well it works in a few years.... - Rob Wolf >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>