Re: [Fot] FW: Flywheel wt & crank harmonics -TR3/4

[fubog1 via Fot <fot@autox.team.net>]

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=20

Note that lighter pistons and connecting rods=20
 That's a BIG gain, it gets some of that recip/bending load out of the main=
s.=20
Glen
=20
=20
-----Original Message-----
From: timmmurphh--- via Fot <fot@autox.team.net>
To: fot@autox.team.net
Sent: Thu, May 21, 2020 7:07 pm
Subject: [Fot] FW: Flywheel wt & crank harmonics -TR3/4

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 =C2=A0From: timmmurphh@gmail.com <timmmurphh@gmail.com>=20
Sent: Thursday, May 21, 2020 6:06 PM
To: 'TeriAnn J. Wakeman' <tjwakeman@gmail.com>
Subject: RE: [Fot] Flywheel wt & crank harmonics -TR3/4 =C2=A0The weight of=
 the flywheel will definitely affect the harmonic frequency.=C2=A0 The heav=
ier the flywheel, the lower the harmonic frequency will be.=C2=A0 The flywh=
eel contributes a significant amount to the total rotating inertia due to i=
ts weight and that the weight is at greater radius than the other rotating =
masses.=C2=A0 Inertia increases as the square of the radius.=C2=A0 It is no=
t a linear function of the radius. =C2=A0An RPM of 5200 was mentioned as th=
e harmonic resonance.=C2=A0 I had always heard that it was more like 6300 R=
PM.=C2=A0 I have never seen a calculation for it.=C2=A0 It would be complex=
.=C2=A0 Note that lighter pistons and connecting rods would tend to lower t=
he harmonic frequency as they would reduce the inertia in the engine. =C2=
=A0Tim Murphy =C2=A0From: Fot <fot-bounces@autox.team.net> On Behalf Of Ter=
iAnn J. Wakeman via Fot
Sent: Thursday, May 21, 2020 2:44 PM
To: FOT <fot@autox.team.net>
Subject: [Fot] Flywheel wt & crank harmonics -TR3/4 =C2=A0Something I have =
wondered about for years.Does the weight of the flywheel affect the RPM and=
 intensity of harmonics inherent in a TR3/4 stock crank? I've never found a=
n answer to that question.TeriAnn__________________________________________=
_____
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<div style="font-family:arial,helvetica;font-size:10pt;color:black"><blockquote 
style="border-left: 2px solid blue; padding-left: 3px;">Note that lighter 
pistons and connecting rods </blockquote></div>

<div> <font size="2">That's a BIG gain, it gets some of that recip/bending load 
out of the mains. <br>
</font></div>

<div><font size="2">Glen</font><br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div 
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original 
Message-----<br>
From: timmmurphh--- via Fot &lt;fot@autox.team.net&gt;<br>
To: fot@autox.team.net<br>
Sent: Thu, May 21, 2020 7:07 pm<br>
Subject: [Fot] FW:  Flywheel wt &amp; crank harmonics -TR3/4<br>
<br>

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<div class="yiv2112036761MsoNormal">&nbsp;</div>

<div class="yiv2112036761MsoNormal"> &nbsp;</div>

<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 
0in;">
<div class="yiv2112036761MsoNormal"><b>From:</b> timmmurphh@gmail.com 
&lt;timmmurphh@gmail.com&gt; <br>
<b>Sent:</b> Thursday, May 21, 2020 6:06 PM<br>
<b>To:</b> 'TeriAnn J. Wakeman' &lt;tjwakeman@gmail.com&gt;<br>
<b>Subject:</b> RE: [Fot] Flywheel wt &amp; crank harmonics -TR3/4</div>
</div>
</div>

<div class="yiv2112036761MsoNormal"> &nbsp;</div>

<div class="yiv2112036761MsoNormal">The weight of the flywheel will definitely 
affect the harmonic frequency.&nbsp; The heavier the flywheel, the lower the 
harmonic frequency will be.&nbsp; The flywheel contributes a significant amount 
to the total rotating inertia due to its weight and that the weight is at 
greater radius than the other rotating masses.&nbsp; Inertia increases as the 
square of the radius.&nbsp; It is not a linear function of the radius.</div>

<div class="yiv2112036761MsoNormal"> &nbsp;</div>

<div class="yiv2112036761MsoNormal">An RPM of 5200 was mentioned as the 
harmonic resonance.&nbsp; I had always heard that it was more like 6300 
RPM.&nbsp; I have never seen a calculation for it.&nbsp; It would be 
complex.&nbsp; Note that lighter pistons and connecting rods would tend to 
lower the harmonic frequency as they would reduce the inertia in the 
engine.</div>

<div class="yiv2112036761MsoNormal"> &nbsp;</div>

<div class="yiv2112036761MsoNormal">Tim Murphy</div>

<div class="yiv2112036761MsoNormal"> &nbsp;</div>

<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 
0in;">
<div class="yiv2112036761MsoNormal"><b>From:</b> Fot &lt;<a rel="nofollow" 
ymailto="mailto:fot-bounces@autox.team.net"; target="_blank" 
href="mailto:fot-bounces@autox.team.net";>fot-bounces@autox.team.net</a>&gt; 
<b>On Behalf Of </b>TeriAnn J. Wakeman via Fot<br>
<b>Sent:</b> Thursday, May 21, 2020 2:44 PM<br>
<b>To:</b> FOT &lt;<a rel="nofollow" ymailto="mailto:fot@autox.team.net"; 
target="_blank" href="mailto:fot@autox.team.net";>fot@autox.team.net</a>&gt;<br>
<b>Subject:</b> [Fot] Flywheel wt &amp; crank harmonics -TR3/4</div>
</div>
</div>

<div class="yiv2112036761MsoNormal"> &nbsp;</div>

<div><span style="font-size:13.5pt;font-family:&quot;Adobe Garamond&quot;, 
serif;">Something I have wondered about for years.</span></div>

<div><span style="font-size:13.5pt;font-family:&quot;Adobe Garamond&quot;, 
serif;">Does the weight of the flywheel affect the RPM and intensity of 
harmonics inherent in a TR3/4 stock crank? I've never found an answer to that 
question.</span></div>

<div><span style="font-size:13.5pt;font-family:&quot;Adobe Garamond&quot;, 
serif;">TeriAnn</span></div>
</div>
</div>
</div>
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