X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "David COOK hoursaway1@comcast.net" Received: from pmg.Logan.com ([207.170.160.161] verified) by logan.com (CommuniGate Pro SMTP 6.4.0) with ESMTPS id 3782706 for flyrotary@lancaironline.net; Fri, 10 Jan 2025 05:42:03 -0500 Received: from pmg.Logan.com (localhost [127.0.0.1]) by pmg.Logan.com (Proxmox) with ESMTP id 55CE729057 for ; Fri, 10 Jan 2025 05:42:03 -0500 (EST) Received-SPF: pass (comcast.net: 96.102.19.43 is authorized to use 'hoursaway1@comcast.net' in 'mfrom' identity (mechanism 'ip4:96.102.19.32/28' matched)) receiver=pmg.Logan.com; identity=mailfrom; envelope-from="hoursaway1@comcast.net"; helo=resqmta-c2p-570110.sys.comcast.net; client-ip=96.102.19.43 Received: from resqmta-c2p-570110.sys.comcast.net (resqmta-c2p-570110.sys.comcast.net [96.102.19.43]) by pmg.Logan.com (Proxmox) with ESMTPS for ; Fri, 10 Jan 2025 05:42:02 -0500 (EST) Received: from resomta-c2p-555481.sys.comcast.net ([96.102.18.232]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 256/256 bits) (Client did not present a certificate) by resqmta-c2p-570110.sys.comcast.net with ESMTPS id WCJntXr7K0k1WWCShtFPui; Fri, 10 Jan 2025 10:41:55 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=20190202a; t=1736505716; bh=4j0NbwFhQg6pdOc/s4+HNImUYQuepkgOKZkdZzH5fTE=; h=Received:Received:Date:From:To:Message-ID:Subject:MIME-Version: Content-Type:Xfinity-Spam-Result; b=FAgi5A076kDuVOd/vhNiZxyb2zHVdo9F249UM4twPXrytnH+ZF0Ky1NN+OymzYm5s zSplLY5IO5idF5z+GbzNfel0LShrhT68fO40hnvJm5P4yvYiBklx6qVDkw8U4QGwin A13fQn6wYUvqqAaBBrtTa2ytr5FGz3ZlgkXWGz09HvvyNpAazVXUvFGp+05ve4fckF ADwCZPIgJKtgoZRv/pckMHGG2t7I7SfZ9Owheft6bSJqQGgi4Qj3vRz2hovR+qXA6d DKS4tauTnR0PmJnPj6lkNBsr3SGFgQySuXpVZ7tJLHWvAVGy+7vwTD/Jtk6ZS/0xcu RJkSQwynmIbFg== Received: from oxapp-ch2g-48o.email.comcast.net ([96.118.136.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 256/256 bits) (Client did not present a certificate) by resomta-c2p-555481.sys.comcast.net with ESMTPS id WCSht3kkYtTgQWCSht59UG; Fri, 10 Jan 2025 10:41:55 +0000 Date: Fri, 10 Jan 2025 05:41:55 -0500 (EST) To: Rotary motors in aircraft Message-ID: <1834510959.1415136.1736505715348@connect.xfinity.com> In-Reply-To: References: Subject: Re: [FlyRotary] Re: Flexplate cracks MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_1415135_329231892.1736505715294" X-Priority: 3 Importance: Normal X-Mailer: Open-Xchange Mailer v7.10.6-Rev59 X-Originating-IP: ::ffff:136.226.108.119 X-Originating-Client: open-xchange-appsuite X-CMAE-Envelope: MS4xfGZM1eS2fP2niK8/K9BixQ7DVQRWy2ax9MFQwwTvGWp/XEA7DSANAy4A95j3cl+KHq9ZLKEoFeNq/nywANVu1XEMeDj+xJGB2bY32tLfJlot+/mOAgKD ioVazQjAjOPUk0flvjpUAZCXiZjkPLWa53EexdQUGtCw5e1jhqEI6rF4hXDwLuhWAmx5dEA1PuAIpGoh+R6rQJkfMuZoA2Mbe7a6dRKy8htB5SOpfair7Re0 X-SPAM-LEVEL: Spam detection results: 0 AWL 0.500 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DKIM_SIGNED 0.1 Message has a DKIM or DK signature, not necessarily valid DKIM_VALID -0.1 Message has at least one valid DKIM or DK signature DKIM_VALID_AU -0.1 Message has a valid DKIM or DK signature from author's domain DKIM_VALID_EF -0.1 Message has a valid DKIM or DK signature from envelope-from domain DMARC_PASS -0.1 DMARC pass policy FREEMAIL_ENVFROM_END_DIGIT 0.25 Envelope-from freemail username ends in digit FREEMAIL_FROM 0.001 Sender email is commonly abused enduser mail provider HTML_MESSAGE 0.001 HTML included in message KAM_MXURI 1.5 URI begins with a mail exchange prefix, i.e. mx.[...] RCVD_IN_DNSWL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to DNSWL was blocked. 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[flyrotary.com,lancaironline.net] WEIRD_PORT 0.001 Uses non-standard port number for HTTP ------=_Part_1415135_329231892.1736505715294 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Starter gear to ring gear clearance, vertical and horizontal must be adjust= ed.=20 > On 01/10/2025 12:49 AM EST Andrew Martin andrew@martinag.com.au wrote: > =20 > =20 > Maybe some of the cracking flexplates are resulting from starting issues,= the starter motor can hammer the ring gear if not meshing correctly or if = engine misfires on start. may explain why so many flexplates come pre-crack= ed from the wreckers. > =20 > Andrew >=20 >=20 >=20 >=20 > On Fri, 10 Jan 2025 at 11:32, Stephen Izett stephen.izett@gmail.com mailt= o:stephen.izett@gmail.com wrote: >=20 > > Hi M > >=20 > > I was wondering the same thing. > >=20 > > What I discovered first of all was that flex plates are designed to fle= x (funny that) and cracking is not limited to our setup. > > There are companies that specialise in stronger flex plates, particular= ly for modified and higher horsepower engines. > >=20 > > Since our engines are being used at a higher horsepower per unit time a= nd therefore higher stress (assumption) perhaps our setup could be likened = to race applications. > > But then our hours of use would be significantly lower (assumption) tha= n an average vehicle, but perhaps not a race application. > > Is the cracking we are seeing consistent with race applications? But th= ey dont race automatics, do they? > >=20 > > So my take on this is that perhaps the flexing of the plate in our setu= p is to some extent higher than OEM. > >=20 > > Our options seem to be: > > 1. Replacing the OEM flex plate with a stronger part. Steve B being the= latest going down that track and in his case also removing the rubber isol= ation in the process. > > 2. Connect direct to the eccentric shaft and therefore taking the stres= s off the Flex Plate doing away with the damping mechanism which Tracy did,= and perhaps is still doing. Would be real nice to know. > >=20 > > Like M, I would appreciate hearing what others know or are thinking or = doing. > >=20 > > Steve Izett > >=20 > >=20 > >=20 > >=20 > >=20 > >=20 > >=20 > >=20 > >=20 > >=20 > >=20 > >=20 > > > On 10 Jan 2025, at 2:15=E2=80=AFam, Marc Wiese cardmarc@charter.net m= ailto:cardmarc@charter.net wrote: > > > > > > Has the cause of these cracks been uncovered, and if so, what is the = current thinking on it? An AL racing plate? > > > M > > > Sent from my iPhone > > > > > >> On Jan 9, 2025, at 1:31=E2=80=AFAM, Steven W. Boese SBoese@uwyo.edu = mailto:SBoese@uwyo.edu wrote: > > >> > > >> Steve, > > >> > > >> I didn=E2=80=99t see the cracks prior to disassembly and doubt that = they could have been seen on the counterweight side very well -if at all- w= hen assembled. > > >> > > >> I replaced the Flexplate with a steel flywheel about a year ago. Si= nce then, I replaced the four rubber dampers with machined aluminum discs g= iving a solid connection and then dynamically balanced the system. This wa= s done because maintaining a dynamic balance wasn=E2=80=99t possible with t= he dampers. Only a few hours of flight have occurred in this configuration= so far and there has been no indication of problems resulting from this ch= ange. > > >> > > >> Steve Boese > > >> > > >>> On Jan 8, 2025, at 11:03=E2=80=AFPM, Stephen Izett stephen.izett@gm= ail.com mailto:stephen.izett@gmail.com wrote: > > >>> > > >>> =E2=97=86 This message was sent from a non-UWYO address. Please exe= rcise caution when clicking links or opening attachments from external sour= ces. > > >>> > > >>> > > >>> Hi Steve > > >>> > > >>> Is this recent then? > > >>> > > >>> I=E2=80=99m not able to get to my aircraft at present to check my f= lex plate which has probably seen 50 hours of service. > > >>> > > >>> Was it possible to see these cracks assembled? > > >>> > > >>> I would appreciate your reflections on Tracys latter choice to remo= ve the damper, and particularly when using a timber/glass prop such as an M= T. > > >>> > > >>> It would be great to have an update and current info from Tracy reg= arding his no damper hours if anyone can contact him. > > >>> > > >>> Very helpful, thanks again Steve > > >>> > > >>> Steve > > >> > > >> -- > > >> Homepage: http://www.flyrotary.com/ > > >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotar= y/List.html > > > > > > > > > > > > -- > > > Homepage: http://www.flyrotary.com/ > > > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary= /List.html > >=20 > >=20 > >=20 > > -- > > Homepage: http://www.flyrotary.com/ > > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/L= ist.html > >=20 >=20 ------=_Part_1415135_329231892.1736505715294 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable =20 =20
Starter gear to= ring gear clearance, vertical and horizontal must be adjusted. 
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On 01/10/2025 12:49 AM EST Andrew Martin andrew@martinag.com.au <fly= rotary@lancaironline.net> wrote:
=20
 
=20
 
=20
=20
Maybe some of the cracking flexplates are resulting from starting issu= es, the starter motor can hammer the ring gear if not meshing correctly or = if engine misfires on start. may explain why so many flexplates come pre-cr= acked from the wreckers.
=20
 
=20
Andrew
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On Fri, 10 Jan 2025 at 11:32, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
=20
Hi M

I was wondering the same thing.=20

What I discovered first of all was that flex plates are designed t= o flex (funny that) and cracking is not limited to our setup.=20
There are companies that specialise in stronger flex plates, parti= cularly for modified and higher horsepower engines.

Since our engines are being used at a higher horsepower per unit t= ime and therefore higher stress (assumption) perhaps our setup could be lik= ened to race applications.
But then our hours of use would be significantly lower (assumption= ) than an average vehicle, but perhaps not a race application.
Is the cracking we are seeing consistent with race applications? B= ut they dont race automatics, do they?

So my take on this is that perhaps the flexing of the plate in our= setup is to some extent higher than OEM.

Our options seem to be:
1. Replacing the OEM flex plate with a stronger part. Steve B bein= g the latest going down that track and in his case also removing the rubber= isolation in the process.
2. Connect direct to the eccentric shaft and therefore taking the = stress off the Flex Plate doing away with the damping mechanism which Tracy= did, and perhaps is still doing. Would be real nice to know.

Like M, I would appreciate hearing what others know or are thinkin= g or doing.

Steve Izett












> On 10 Jan 2025, at 2:15=E2=80=AFam, Marc Wiese cardmarc@chart= er.net <flyrotary@lancaironline.net> wrote:
>=20
> Has the cause of these cracks been uncovered, and if so, what= is the current thinking on it? An AL racing plate?
> M
> Sent from my iPhone
>=20
>> On Jan 9, 2025, at 1:31=E2=80=AFAM, Steven W. Boese SBoese@uwy= o.edu <flyrotary@lancaironline.net> wrote:
>>=20
>> Steve,
>>=20
>> I didn=E2=80=99t see the cracks prior to disassembly and = doubt that they could have been seen on the counterweight side very well -i= f at all- when assembled.
>>=20
>> I replaced the Flexplate with a steel flywheel about a ye= ar ago.  Since then, I replaced the four rubber dampers with machined = aluminum discs giving a solid connection and then dynamically balanced the = system.  This was done because maintaining a dynamic balance wasn=E2= =80=99t possible with the dampers.  Only a few hours of flight have oc= curred in this configuration so far and there has been no indication of pro= blems resulting from this change.
>>=20
>> Steve Boese
>>=20
>>> On Jan 8, 2025, at 11:03=E2=80=AFPM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net>= wrote:
>>>=20
>>> =E2=97=86 This message was sent from a non-UWYO addre= ss. Please exercise caution when clicking links or opening attachments from= external sources.
>>>=20
>>>=20
>>> Hi Steve
>>>=20
>>> Is this recent then?
>>>=20
>>> I=E2=80=99m not able to get to my aircraft at present= to check my flex plate which has probably seen 50 hours of service.
>>>=20
>>> Was it possible to see these cracks assembled?
>>>=20
>>> I would appreciate your reflections on Tracys latter = choice to remove the damper, and particularly when using a timber/glass pro= p such as an MT.
>>>=20
>>> It would be great to have an update and current info = from Tracy regarding his no damper hours if anyone can contact him.
>>>=20
>>> Very helpful, thanks again Steve
>>>=20
>>> Steve
>>=20
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html
>=20
>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html



--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http= ://mail.lancaironline.net:81/lists/flyrotary/List.html
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