X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm23.access.bullet.mail.sp2.yahoo.com ([98.139.44.150] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with SMTP id 5054982 for flyrotary@lancaironline.net; Sun, 17 Jul 2011 23:28:17 -0400 Received-SPF: softfail receiver=logan.com; client-ip=98.139.44.150; envelope-from=echristley@nc.rr.com Received: from [98.139.44.100] by nm23.access.bullet.mail.sp2.yahoo.com with NNFMP; 18 Jul 2011 03:27:42 -0000 Received: from [98.139.44.92] by tm5.access.bullet.mail.sp2.yahoo.com with NNFMP; 18 Jul 2011 03:27:42 -0000 Received: from [127.0.0.1] by omp1029.access.mail.sp2.yahoo.com with NNFMP; 18 Jul 2011 03:27:42 -0000 X-Yahoo-Newman-Id: 487439.57302.bm@omp1029.access.mail.sp2.yahoo.com Received: (qmail 38399 invoked from network); 18 Jul 2011 03:27:42 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1310959662; bh=c8HgGm5c2l9RkSKnlnBwh5zwJSt+nW0Ym0VPQ2Xo1oE=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:Date:From:Reply-To:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:Content-Type; b=s3x3k+9yLd+7uP8J6mKJOn5gHnDwAobwqHNYeDulKlZERomy2C5YujcmJU1UJaB2cvbVaMNPxKR1oIRlQiKzt6SfTq40BxX3DBDOAKfXF0ts3/PVfV7j3tglW0KG2bchPmApjpT2JOSbkavfCDcqEVll4Flq5A79hoXdl9S8CFg= Received: from [192.168.1.2] (echristley@65.190.53.180 with plain) by smtp106.sbc.mail.gq1.yahoo.com with SMTP; 17 Jul 2011 20:27:41 -0700 PDT X-Yahoo-SMTP: 40RP3pGswBDvPav1a.I8eMv.KS8bdgWBnCloVoKaow-- X-YMail-OSG: zwyu8OsVM1lPpWTsEXtoholZtzE_R7KDGK.wPbmuI.91HPa IldML6QFPgIKkfJS1Uwg_QFdVNl9Suv5zzReklxShIkiMmS_U4P9hYm8Elc2 Eyn55e0PPAK5tupfSuJKApP_D23ywFCNILbf9tOBjLcBlNEpql0FivCp9Gzx FXjG5_rbmQvjF.GemV0IQqKhNypYn7ofowbzomlx1TRPlHXzfZdDl_4U.y8x Pg1RhitiKP_eW2w9zow_cN9ZszIf_GTOFBT8xQanDolL9Dul7wVVrOiadI_G SlxKEllJmVz4I.byXVhZ6TZFeFiEmuU8u3o5gyssqTfNBxNDG4w-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <4E23A828.4040402@nc.rr.com> Date: Sun, 17 Jul 2011 23:27:36 -0400 From: Ernest Christley Reply-To: echristley@att.net User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110424 Lightning/1.0b2 Thunderbird/3.1.10 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Flex Plate Failure - Improvements References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------090105070207050206000505" This is a multi-part message in MIME format. --------------090105070207050206000505 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 07/15/2011 11:55 PM, Lehanover@aol.com wrote: > I made up a small steel flywheel to fit the counter-weight, but only > big enough to bolt on a 5 1/2" Tilton dual disc clutch pack. I used a > flex plate only to carry the starter ring. It did not occur to me to > try to transmit torque through the flex plate. I had one of my drivers > miss a shift and reved to the moon. The conical shape of the flex > plate went dead flat. Bits of ring gear around the welds hug on and > nearly cut the bell housing into two pieces. The remaining pieces were > dribbled out onto the track for others to deal with. The flange the > ring gear sat on was turned to 45 degrees. After that I TIGed the > whole gear to the flex plate. They do fail in cars, that is why you > can buy one with the cracks already installed. There used to be a > doubler plate on top of the bolt circle to spread out the strain of > the mounting bolts and reduce cracking. Are those still being used? > Probably not a problem for airplanes, but I would not transfer torque > with one. > Lynn E. Hanover > Mine has a doubler plate. --------------090105070207050206000505 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit On 07/15/2011 11:55 PM, Lehanover@aol.com wrote:

I made up a small steel flywheel to fit the counter-weight, but only big enough to bolt on a 5 1/2" Tilton dual disc clutch pack. I used a flex plate only to carry the starter ring. It did not occur to me to try to transmit torque through the flex plate. I had one of my drivers miss a shift and reved to the moon. The conical shape of the flex plate went dead flat. Bits of ring gear around the welds hug on and nearly cut the bell housing into two pieces. The remaining pieces were dribbled out onto the track for others to deal with. The flange the ring gear sat on was turned to 45 degrees. After that I TIGed the whole gear to the flex plate. They do fail in cars, that is why you can buy one with the cracks already installed. There used to be a doubler plate on top of the bolt circle to spread out the strain of the mounting bolts and reduce cracking. Are those still being used?

Probably not a problem for airplanes, but I would not transfer torque with one.

Lynn E. Hanover

Mine has a doubler plate.
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