X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-db02.mx.aol.com ([205.188.91.96] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5053432 for flyrotary@lancaironline.net; Fri, 15 Jul 2011 23:56:27 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.91.96; envelope-from=Lehanover@aol.com Received: from imo-ma03.mx.aol.com (imo-ma03.mx.aol.com [64.12.78.138]) by imr-db02.mx.aol.com (8.14.1/8.14.1) with ESMTP id p6G3tjwW024690 for ; Fri, 15 Jul 2011 23:55:45 -0400 Received: from Lehanover@aol.com by imo-ma03.mx.aol.com (mail_out_v42.9.) id q.ef8.17d634a5 (55762) for ; Fri, 15 Jul 2011 23:55:41 -0400 (EDT) Received: from magic-d27.mail.aol.com (magic-d27.mail.aol.com [172.19.146.161]) by cia-md05.mx.aol.com (v129.10) with ESMTP id MAILCIAMD053-d9d24e210bbd30d; Fri, 15 Jul 2011 23:55:41 -0400 From: Lehanover@aol.com Message-ID: Date: Fri, 15 Jul 2011 23:55:41 EDT Subject: Re: [FlyRotary] Re: Flex Plate Failure - Improvements To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_d3621.61126ceb.3b5265bd_boundary" X-Mailer: AOL 9.6 sub 5004 X-AOL-IP: 173.88.24.45 X-Spam-Flag:NO X-AOL-SENDER: Lehanover@aol.com --part1_d3621.61126ceb.3b5265bd_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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 In a message dated 7/15/2011 2:42:02 P.M. Paraguay Standard Time, rwstracy@gmail.com writes: I'm still in analysis mode on this myself. So far the possibilities are: 1. The flex plate may have been warped when installed ( I bought several that were) I think the standard should be close to zero runout or wobble on the flexplate in view of this failure. --part1_d3621.61126ceb.3b5265bd_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I made up a small steel flywheel to fit the counter-weight, but only= big=20 enough to bolt on a 5 1/2" Tilton dual disc clutch pack. I used a flex pla= te=20 only to carry the starter ring. It did not occur to me to try to transmit= torque=20 through the flex plate. I had one of my drivers miss a shift and reved to= the=20 moon. The conical shape of the flex plate went dead flat. Bits of ring gea= r=20 around the welds hug on and nearly cut the bell housing into two pieces.= The=20 remaining pieces were dribbled out onto the track for others to deal with.= The=20 flange the ring gear sat on was turned to 45 degrees. After that I TIGed= the=20 whole gear to the flex plate. They do fail in cars, that is why you can bu= y one=20 with the cracks already installed. There used to be a doubler plate on top= of=20 the bolt circle to spread out the strain of the mounting bolts and reduce= =20 cracking. Are those still being used?

Probably not a problem for airplanes, but I would not transfer torque= with=20 one.

Lynn E. Hanover

In a message dated 7/15/2011 2:42:02 P.M. Paraguay Standard Time,=20 rwstracy@gmail.com writes:

I'm=20 still in analysis mode on this myself.

So far the possibilities= =20 are:

1. The flex plate may have been warped when installed = ( I=20 bought several that were) I think the standard should be close to= zero=20 runout or wobble on the flexplate in view of this=20 failure.

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