Return-Path: Received: from king1.vineyard.net ([204.17.195.90]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Mon, 16 Oct 2000 23:08:07 -0400 Received: (from mail@localhost) by king1.vineyard.net (8.9.3/8.9.0) id XAA34801 for ; Mon, 16 Oct 2000 23:15:23 -0400 (EDT) Received: from psy90.vineyard.net(199.232.91.74) by K1.VINEYARD.NET via smap/slg (V2.0) id sma034430; Mon Oct 16 23:14:50 2000 Message-Id: <200010170315.XAA34801@king1.vineyard.net> From: "Ted Stanley" To: Subject: Preventing Spinner Backup Plate Stress Fractures Date: Mon, 16 Oct 2000 23:11:19 -0400 X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> I can't say I have any experience with the cracking spinner parts you all are having but ....... Years ago Piper had an awful problem with the spinner back plates of their Piper Warrior aircraft which use a Lycoming O-320 engine. They came up with several designs but all seemed to crack. I had a customer who had a cracked back plate. I got a new spinner back-plate removed the doubler (riveted in place with a couple of -3 rivets) and bonded the doubler in place with Dexter-Hysol number EA9394NA and reinstalled the rivets. EA9394NA is rather expensive and is used as a liquid shim on fighter jet wing fittings. On significant caution ............ be very CAREFUL with whatever is between the crankshaft flange and the mounting bolt heads. If the material is prone to cold flow (kinda ooze out as it were) the torque of the mounting bolts may be lost and it would not be difficult to imagine you to be prop-less in flight ! The Warrior ? My fix worked fine. So far it hasn't cracked and that was many hundreds of hours ago. Good Luck. Ted Stanley A&P-IA >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>