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From: 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
=20
The weight of the flywheel will definitely affect the harmonic =
frequency. The heavier the flywheel, the lower the harmonic frequency =
will be. 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. Inertia increases as the square =
of the radius. It is not a linear function of the radius.
=20
An RPM of 5200 was mentioned as the harmonic resonance. I had always =
heard that it was more like 6300 RPM. I have never seen a calculation =
for it. It would be complex. Note that lighter pistons and connecting =
rods would tend to lower the harmonic frequency as they would reduce the =
inertia in the engine.
=20
Tim Murphy
=20
From: Fot <fot-bounces@autox.team.net =
via Fot
Sent: Thursday, May 21, 2020 2:44 PM
Subject: [Fot] Flywheel wt & crank harmonics -TR3/4
=20
Something 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 an answer to =
that question.
TeriAnn
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class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> timmmurphh@gmail.com =
<timmmurphh@gmail.com> <br><b>Sent:</b> Thursday, May 21, 2020 =
6:06 PM<br><b>To:</b> 'TeriAnn J. Wakeman' =
<tjwakeman@gmail.com><br><b>Subject:</b> RE: [Fot] Flywheel wt =
& crank harmonics -TR3/4<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>The weight =
of the flywheel will definitely affect the harmonic frequency. The =
heavier the flywheel, the lower the harmonic frequency will be. =
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. Inertia increases as the square of the =
radius. It is not a linear function of the =
radius.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>An RPM of 5200 was mentioned as the harmonic =
resonance. I had always heard that it was more like 6300 =
RPM. I have never seen a calculation for it. It would be =
complex. Note that lighter pistons and connecting rods would tend =
to lower the harmonic frequency as they would reduce the inertia in the =
engine.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Tim Murphy<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Fot <<a =
href=3D"mailto:fot-bounces@autox.team.net";>fot-bounces@autox.team.net</a>=
> <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 <<a =
href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>><br><b>Subje=
ct:</b> [Fot] Flywheel wt & crank harmonics =
-TR3/4<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><p><span =
style=3D'font-size:13.5pt;font-family:"Adobe Garamond",serif'>Something =
I have wondered about for years.</span><o:p></o:p></p><p><span =
style=3D'font-size:13.5pt;font-family:"Adobe Garamond",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><o:p></o:p></p><p><span =
style=3D'font-size:13.5pt;font-family:"Adobe =
Garamond",serif'>TeriAnn</span><o:p></o:p></p></div></body></html>
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