X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.245] (HELO mail.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTP id 5084004 for flyrotary@lancaironline.net; Sat, 06 Aug 2011 11:51:59 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.245; envelope-from=bhughes@qnsi.net Received: from 10.0.0.5 ([10.0.0.5]) by qnsi-mail.qnsi.net ([10.0.0.5]) with Microsoft Exchange Server HTTP-DAV ; Sat, 6 Aug 2011 16:52:18 +0000 Subject: Re: [FlyRotary] Re: Fwd: Flex plate cracks References: From: "Bobby J. Hughes" Content-Type: multipart/alternative; boundary="Apple-Mail-10--668762434"; charset="iso-8859-1" In-Reply-To: Message-ID: <10543199-3A31-48A7-8561-1F41389919A9@qnsi.net> Date: Sat, 6 Aug 2011 10:51:26 -0500 To: "Rotary motors in aircraft" Content-Transfer-Encoding: 7bit thread-topic: [FlyRotary] Re: Fwd: Flex plate cracks MIME-Version: 1.0 (iPad Mail 8J2) thread-index: AcxUWTPU121bxJohQ1G4/64dSUtPqA== --Apple-Mail-10--668762434 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii The modified aftermarket part my work but I would prefer a "standardized" so= lution be adopted. In my opinion the gearbox is one item in our unique aircr= aft that should not be modified. The more hours we accumulate as a group the= faster any weak links will surface and be corrected. Three items have been i= dentified within the last two years. =20 1. Pin size increase. I think Tracy has made a change for new gearboxes. Si= nce I'm running a supercharger I will be sending mine back for an upgrade. 2. Harder rivets in the drive plate. I think Tracy has made the change for n= ew gearboxes. I'll replace mine if /when I see any wear. I painted the area w= hite so any smoke trail (or oil) is easy to see. 3. Flex plate. I'm sure Tracy will identify a solution for existing and new g= earbox customers. Until that happens I'll keep inspecting mine every few hou= rs. If the change is a custom RWS part and a few hundred dollars that's ok.=20= It also appears these items are showing up first / only on higher horsepower= installations. Boosted and 20b's. I think we have a good gearbox and as a g= roup we're identifying and correcting the weak areas and making our installa= tions more reliable. In the near term Dave may need a one-off for Reno. Buyi= ng, individually machining and balancing an aftermarket part, that will like= ly be discontinued within a few years doesn't sound like a longterm repeatab= le solution. Safety in numbers? Bobby ( no Hushpower II mufflers or overly tight water pump belts either) Sent from my iPad On Aug 6, 2011, at 1:03 AM, "Chad Robinson" wro= te: > Cost, availability? >=20 > On Aug 6, 2011 12:44 AM, "David Leonard" wrote: > > And here is a good view showing the thickness. > >=20 > > On Fri, Aug 5, 2011 at 9:41 PM, David Leonard wrot= e: > >=20 > >> Well, I'd say that pretty well seals the fate of using flex plates. You= > >> guys all owe me a beer for finding the issue :-) > >> > >> Here are some pictures of the machined flywheel that Kelly turned us on= to > >> (ACT prolite). Weight is now under 9 lbs. I think it is a good balance > >> between weight and beefyness. Someone with better access to a CNC could= > >> make the mods quick and easy, and the mods to that start/addapter plate= are > >> pretty easy. > >> > >> Here is the front side. > >> > >> -- > >> David Leonard > >> > >> Turbo Rotary RV-6 N4VY > >> http://N4VY.RotaryRoster.net > >> http://RotaryRoster.net > >> > >> On Fri, Aug 5, 2011 at 6:08 PM, Charlie England wrote: > >> > >>> > >>> > >>> I was moving stuff around in the hangar today& picked up my salvage ya= rd > >>> flex > >>> plate. Found two 3/4" cracks: down from 9 o'clock& up from 3 o'clock > >>> holes in > >>> the pic. Plate has never flown AFAIK. > >>> > >>> Charlie > >>> > >>> > >>> > >>> > >>> -- > >>> Homepage: http://www.flyrotary.com/ > >>> Archive and UnSub: > >>> http://mail.lancaironline.net:81/lists/flyrotary/List.html > >>> > >>> > >> > >> > >> > >=20 > >=20 > > --=20 > > David Leonard > >=20 > > Turbo Rotary RV-6 N4VY > > http://N4VY.RotaryRoster.net > > http://RotaryRoster.net --Apple-Mail-10--668762434 Content-Transfer-Encoding: base64 Content-Type: text/html; charset=utf-8 PGh0bWw+PGJvZHkgYmdjb2xvcj0iI0ZGRkZGRiI+PGRpdj5UaGUgbW9kaWZpZWQgYWZ0ZXJtYXJr ZXQgcGFydCBteSB3b3JrIGJ1dCBJIHdvdWxkIHByZWZlciBhICJzdGFuZGFyZGl6ZWQiIHNvbHV0 aW9uIGJlIGFkb3B0ZWQuIEluIG15IG9waW5pb24gdGhlIGdlYXJib3ggaXMgb25lIGl0ZW0gaW4g b3VyIHVuaXF1ZSBhaXJjcmFmdCB0aGF0IHNob3VsZCBub3QgYmUgbW9kaWZpZWQuIFRoZSBtb3Jl IGhvdXJzIHdlIGFjY3VtdWxhdGUgYXMgYSBncm91cCB0aGUgZmFzdGVyIGFueSB3ZWFrIGxpbmtz IHdpbGwgc3VyZmFjZTxzcGFuIGNsYXNzPSJBcHBsZS1zdHlsZS1zcGFuIiBzdHlsZT0iLXdlYmtp 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