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Subject: Re: [FlyRotary] Flexplate replacement
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Joe,
=C2=A0
 I am a little concerned with this approach-- not that it won'd work but ad=
ding material with all kinds of different coefficients with the hope of str=
engthening may possibly have the opposite effect. For example adding carbon=
 to fiberglass has the problem that in the failure mode, when one of the su=
bstrates gives out, it transfers an instant load to the other with sometime=
s catastrophic results, which might not have been seen with the failure mod=
e of one of the substrates by itself.
=C2=A0
Not knowing much about this, I sure would like to have a real engineer do a=
n evaluation of the addition of the carbon.
=C2=A0
=C2=A0
Rich
In a message dated 10/30/2018 12:31:55 PM Central Standard Time, flyrotary@=
lancaironline.net writes:

=C2=A0
I have tried to search the archives and found part of the story.
I=C2=A0 think it will take a while to find all of the emails.
Found pics of Dave=E2=80=99s broken flexplate.
The pics of Dave=E2=80=99s flywheel are very disturbing.=C2=A0
It appears that the destructive stresses occur between the counterweight bo=
lt circle and the torsional damper bolt circle.=C2=A0
If a good flexplate could be modified to strengthen the areas could this be=
 a fix?
Clean the flexplate =C2=A0in the area of the bolt circles and perform a lay=
up of carbon fiber on both sides.
A layer of Eglass would be placed between the carbon and steel flexplate to=
 prevent galvanic reaction.
The mounting plate for the RD-1C would have to be shimmed the thickness of =
the carbon fiber.
Has anyone thought about this?
Joe Berki
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<div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;">
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">Joe,</span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;"> I am a little concerned with this approach-- not that it won'd work but adding material with all kinds of different coefficients with the hope of strengthening may possibly have the opposite effect. For example adding carbon to fiberglass has the problem that in the failure mode, when one of the substrates gives out, it transfers an instant load to the other with sometimes catastrophic results, which might not have been seen with the failure mode of one of the substrates by itself.</span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">Not knowing much about this, I sure would like to have a real engineer do an evaluation of the addition of the carbon.</span></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;"><br></span></div>
<div><br></div>
<div><span style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000; background-color: #ffffff;">Rich</span></div>
</div>
In a message dated 10/30/2018 12:31:55 PM Central Standard Time, flyrotary@lancaironline.net writes:
<div><br></div>
<div class="quotedReply">
<blockquote style="padding-left: 5px; margin-left: 5px; border-left: blue 2px solid;">
<div class="aolReplacedBody" lang="EN-US">
<div class="WordSection1">
<p class="MsoNormal">I have tried to search the archives and found part of the story.</p>
<p class="MsoNormal">I&nbsp; think it will take a while to find all of the emails.</p>
<p class="MsoNormal">Found pics of Dave&rsquo;s broken flexplate.</p>
<p class="MsoNormal">The pics of Dave&rsquo;s flywheel are very disturbing.&nbsp;</p>
<p class="MsoNormal">It appears that the destructive stresses occur between the counterweight bolt circle and the torsional damper bolt circle.&nbsp;</p>
<p class="MsoNormal">If a good flexplate could be modified to strengthen the areas could this be a fix?</p>
<p class="MsoNormal">Clean the flexplate &nbsp;in the area of the bolt circles and perform a layup of carbon fiber on both sides.</p>
<p class="MsoNormal">A layer of Eglass would be placed between the carbon and steel flexplate to prevent galvanic reaction.</p>
<p class="MsoNormal">The mounting plate for the RD-1C would have to be shimmed the thickness of the carbon fiber.</p>
<p class="MsoNormal">Has anyone thought about this?</p>
<p class="MsoNormal">Joe Berki</p>
</div>
</div>
</blockquote>
</div>
</div>
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