Return-Path: Received: from imo18.mx.aol.com ([198.81.17.8]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Tue, 22 Dec 1998 02:07:40 -0500 Received: from RWolf99@aol.com by imo18.mx.aol.com (IMOv18.1) id 8KJGa21691 for ; Tue, 22 Dec 1998 02:08:47 -0500 (EST) From: RWolf99@aol.com Message-ID: Date: Tue, 22 Dec 1998 02:08:47 EST To: lancair.list@olsusa.com Subject: Shimming Main Gear Aft Attachment X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Concerning shimming the main gear attachment to the aft spar -- I had a perfect fit on one side, but a 0.050" gap on the other, which needed six bid to shim. That worked out well. I don't think I would shim a quarter inch gap with BID, however. I'd use a piece of 6061 aluminum. Alodine or anodize it, first. It really shouldn't matter what type of aluminum you use. The loads are small compared to the compressive stress of aluminum. The shim wouldn't really be loaded up in shear or bearing. 2024 is susceptible to stress corrosion cracking (unlike 6061) but that's not an issue here. Of course, it you have a chunk of 2024 lying around, it'll do fine. I don't think I'd use bare phenolic here due to concerns about long-term degradation. Of course, if you beveled the edges and put 2 BID over it for water protection, you'd probably get good results and be substantially lighter than the aluminum. - Rob Wolf