X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=L4JfeKb8 c=1 sm=1 tr=0 a=U1KiVfoyyPqASHr7LnBivw==:117 a=x7bEGLp0ZPQA:10 a=A-0mRrAPPO4A:10 a=smKx5t2vBNcA:10 a=1XWaLZrsAAAA:8 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=o2QoyYduAAAA:8 a=gCLGbAHZAV5-nIRjYaEA:9 a=QEXdDO2ut3YA:10 a=eoKlpTg6jm5rMNBLGNAA:9 a=uFyIGr7JX4URHCEI:21 a=Urk15JJjZg1Xo0ryW_k8:22 a=S50rnUa8yRbNnh2hyxzf:22 From: "Charlie England ceengland7@gmail.com" Received: from mail-pf1-f175.google.com ([209.85.210.175] verified) by logan.com (CommuniGate Pro SMTP 6.2.8) with ESMTPS id 11816316 for flyrotary@lancaironline.net; Sun, 28 Oct 2018 17:49:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.175; envelope-from=ceengland7@gmail.com Received: by mail-pf1-f175.google.com with SMTP id a15-v6so3011333pfn.0 for ; Sun, 28 Oct 2018 14:49:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=FFygy2xnvSCFFQd/wwzCZ3J8mHRGy/mMioycBWBjlWk=; b=ZGPuonBVetdCj6tZ8UF6xkq76ZCg23jZevY3IR4v2mWYwuQB2pjenxucm9WcwkZ4m4 o7pxMDutNIL6mvmKRO+0e9Jm8jNqIH1roocSYcZripPB6MHjsiMMlnYy3dqioBIEM3Rk cVz3Vsz6tDQ0EL9Ug6ukgQsVLZxwGPFEcXPWgmPwVa71MRigNTnC/cuBWw04gjKggNbQ 0zzHkNiCCxWYXeuyq+HuwwEpETt/Urj1QHrrwkzT+JLlPag3LBJidXkjSCOsQdQfzj3g R0T3/kRE5mnjBlhS1BREWHtpUEL7iwGD6PVzgvya34WQD5K50cuSMB14zJ3q0FglvKsV 3Mig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=FFygy2xnvSCFFQd/wwzCZ3J8mHRGy/mMioycBWBjlWk=; b=Oipi5qLuR+iYLJ6FQtw1MKL0NiKKSIVUTEVdZQRRXSq4B1jLLwIgCZ4wyrNFaq8HIk 1n3HWeF7AB26kUCFn/PgP/f30zt1HaepId6M36m02IR47h30UzKfSRBoTwgjOae7NB07 x3A9Z1kSryKEdCvT68BDEHrjUSfkuR25eHT3gATEqolnfcZB2cjvXO85KZE2pXXGuLDu s/wm5TVinBqP+GaECIneaXVonyPrff9qvBQZAnmoOjzfzCSkbpmzY3wfNmloAYN4IzdD REjOckwhbv+rJPwpRVRdMLxKE4CAyBmVSOzENLJ32QD2fUCM9isTgq6PMI5aFl/vSTbm pWnw== X-Gm-Message-State: AGRZ1gJOBbv6YYgXnBjIyjFKOSBUH3wPVHVnouQOQISil95WyEJFeKqd xxXBhgeA911QsvlpRELj5pbv9WJMsNCNqjx3+5oEDM5I X-Google-Smtp-Source: AJdET5ezx7Gv6JZSbbpvMNuwXL1iXUdB9D9TTscC7GJScqAuoRUqEG3IbvmIyiI9egXDnUjoWko2OE9rOfxk3GeCzi0= X-Received: by 2002:a63:f006:: with SMTP id k6mr7663318pgh.259.1540763327633; Sun, 28 Oct 2018 14:48:47 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Sun, 28 Oct 2018 16:48:35 -0500 Message-ID: Subject: Re: [FlyRotary] Re: Flexplate location / failure To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000d39f87057950ea53" --000000000000d39f87057950ea53 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable As a heads-up to new arrivals, the flexplate cracking issue likely predates use of the engine in aircraft. I've got one that's never flown that has two cracks. I think Len Hanover mentioned that mishandling at wrecking yards may be one cause (dropping the engine on the flexplate when storing it). It doesn't seem to be limited to rotaries, either. https://www.google.com/search?ei=3DkizWW_L1KYOuzwKdkaLYBA&q=3D+flexplate+cr= ack+symptoms&oq=3D+flexplate+crack+symptoms&gs_l=3Dpsy-ab.3..0.9099.9099..1= 0752...0.0..0.153.153.0j1......0....1..gws-wiz.ntPTjk3KElA Bottom line for me is to check before using. That's how I discovered cracks in mine. Charlie On Sun, Oct 28, 2018 at 12:48 PM David Leonard wdleonard@gmail.com < flyrotary@lancaironline.net> wrote: > Hi Joe, > Yes, my flex plate not only developed cracks but basically disintegrated. > Keep in mind that I was running about 300hp at rookie school for Reno. > None the less, the flex plate was never designed to transmit the output o= f > engine, just allow the starter to turn it over. The lightening holes in = it > alow flexing that initiated the cracks, then the whole thing shattered. > Surprisingly, in my case the pieces happend to jam together in such a way > that it still functioned until I happend to find it on inspection several > flight hours later. > > All the details of my fix are in the archives somewhere, but basically I > replaced the flex plate with an off the shelf lightweight flywheel that I > addapted to accept tracys damper plate. I took it to a machine shop to > have the mounting holes correctly placed. I also had it balanced, but I > probably could have skipped that step. I also had to machine a recess in= to > Tracys mounting plate to allow the starter to reach the teeth on the > flywheel. Details are in the archivees somewhere. That was going on in > June July and Aug of 2011, which may make it easier to find. > > Tracy also engineered a fix. His solution is in the archives too. He > also seemed to think that the flex plate was good enough for a normially > aspirated 13b, but after seeeing what happend to mine, I believe that eve= n > a n.a. 13b would eventually fatugue the flex plate into the same result. > As I recall, at least one other person detected cracks in the same place= . > > Best, > Dave Leonard > > On Sun, Oct 28, 2018, 4:23 AM Joseph Berki jskmberki@windstream.net < > flyrotary@lancaironline.net> wrote: > >> >> >> I believe that Dave Lenard had an issue with cracks appearing in the >> flexplate. He came up with a solution and does anyone recall the detai= ls >> of the solution and would it work for all 13bs with Tracy=E2=80=99s PSRU= ? >> >> Joe Berki >> > --000000000000d39f87057950ea53 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
As a heads-up to new arrivals, the flexplate cracking issue l= ikely predates use of the engine in aircraft. I've got one that's n= ever flown that has two cracks. I think Len Hanover mentioned that mishandl= ing at wrecking yards may be one cause (dropping the engine on the flexplat= e when storing it). It doesn't seem to be limited to rotaries, either.<= /div>
https://www.google.com/search?ei= =3DkizWW_L1KYOuzwKdkaLYBA&q=3D+flexplate+crack+symptoms&oq=3D+flexp= late+crack+symptoms&gs_l=3Dpsy-ab.3..0.9099.9099..10752...0.0..0.153.15= 3.0j1......0....1..gws-wiz.ntPTjk3KElA

Bottom line for me is to check= before using. That's how I discovered cracks in mine.

Charlie

On Sun, Oct 28, 201= 8 at 12:48 PM David Leonard wdleonar= d@gmail.com <flyrotar= y@lancaironline.net> wrote:
=
Hi Joe,
Yes, my flex plate not only deve= loped cracks but basically disintegrated.=C2=A0 Keep in mind that I was run= ning about 300hp at rookie school for Reno.=C2=A0 None the less, the flex p= late was never designed to transmit the output of engine, just allow the st= arter to turn it over.=C2=A0 The lightening holes in it alow flexing that i= nitiated the cracks, then the whole thing shattered.=C2=A0 Surprisingly, in= my case the pieces happend to jam together in such a way that it still fun= ctioned until I happend to find it on inspection several flight hours later= .

All the details of my = fix are in the archives somewhere, but basically I replaced the flex plate = with an off the shelf lightweight flywheel that I addapted to accept tracys= damper plate.=C2=A0 I took it to a machine shop to have the mounting holes= correctly placed.=C2=A0 I also had it balanced, but I probably could have = skipped that step.=C2=A0 I also had to machine a recess into Tracys mountin= g plate to allow the starter to reach the teeth on the flywheel.=C2=A0 Deta= ils are in the archivees somewhere.=C2=A0 That was going on in June July an= d Aug of 2011, which may make it easier to find.
Tracy also engineered a fix.=C2=A0 His solution is= in the archives too.=C2=A0 He also seemed to think that the flex plate was= good enough for a normially aspirated 13b, but after seeeing what happend = to mine, I believe that even a n.a. 13b would eventually fatugue the flex p= late into the same result.=C2=A0 =C2=A0As I recall, at least one other pers= on detected cracks in the same place.

Best,
Dave Leonard

On Sun, Oct 28, 2018, 4:23 AM Josep= h Berki jskmb= erki@windstream.net <flyrotary@lancaironline.net> wrote:

=C2=A0

I b= elieve that Dave Lenard had an issue with cracks appearing in the flexplate= .=C2=A0 He came up with a solution and does anyone recall =C2=A0the details= of the solution and would it work for all 13bs with Tracy=E2=80=99s PSRU?<= u>

Joe Berki

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