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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>George,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Motors designed to be mounted on one end
only in airframes with structure strong enough to handle the substantial
cantilevered rotating mass work just fine. Several years ago, several planes
(different designs and manufacturers) with several motor types had problems
with “whirl flutter” and motors broke loose, departed the plane, or
tore the nose off the plane. Having run softmounted, hardmounted, firewall
mounted, nosering mounted, and mounted on both ends, I’ve found it
easiest to control resonances in the plane when the mount is at both ends, and
even better when a softmount is used. A number of guys in D1 are running the
Hacker A60 hardmounted to the nosering with a hardmounted aft bearing support –
which the motor is designed for (Hacker sells a mount, or you can buy a flange
bearing and setup your own aft support mechanism).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dave<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>George W.Kennie<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, June 03, 2009
12:48 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">General
pattern discussion</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Motor Mount</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>Hi John,</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>Sorry to have to tell you that I received no replies to my
inquiry.</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>I have the feeling that most people are just not addressing
this issue.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>It would make a great product for somebody like Jerry or
Chris to produce.All that would be required is </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>an X brace with an oversize receptacle at center to receive
plastic inserts (like props) sized to fit shaft</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>bearings.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>Georgie</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:jferrell13@triad.rr.com" title="jferrell13@triad.rr.com">John
Ferrell</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">General pattern discussion</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Wednesday, June
03, 2009 8:50 AM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re: [NSRCA-discussion]
Motor Mount<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>FWIW:</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am interested in an answer to your question too! It sure
looks to me like some kind of nose bearing would be prudent...</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>John Ferrell W8CCW<br>
<br>
"All that is necessary for the triumph of evil is for good men to do
nothing." -- Edmund Burke<br>
...."The problem with socialism is that you eventually run out of other
people's money." <br>
MARGARET THATCHER <br>
<a href="http://DixieNC.US">http://DixieNC.US</a><o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:geobet4@verizon.net" title="geobet4@verizon.net">George W.Kennie</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Monday, June 01,
2009 4:54 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> [NSRCA-discussion]
Motor Mount<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>Hey Guys,</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>I have a new project in the works and it involves mounting a
2K watt motor. This will be my first larger motor install so I felt that some
advice from the Pros</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>would probably be appropriate.</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>The Motor is an outrunner and I can mount it from the back
side directly to the firewall OR I can use standoffs and mount it from the
front side of the motor.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>I keep feeling that there needs to be some kind of a
stabilizing bearing on the free end as there portends to be a significant
amount of rotating mass if I just </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>bolt the thing to the firewall while a pound of motor whirls
around with a large prop exerting inertial rotating energy beyond the front of
the cowl. It seems like </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>If I use the stand-offs, there will be a more rigid area
between the prop and the motor, but then I worry about the back end. Should I
figure out some kind of a </span></font><o:p></o:p></p>
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<div>
<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>bearing mount on the firewall?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>Somebody set me straight on the accepted procedure please. </span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>Thanks for you help,</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=4 face=Arial><span style='font-size:13.5pt;
font-family:Arial'>Georgie</span></font> <o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>_______________________________________________<br>
NSRCA-discussion mailing list<br>
NSRCA-discussion@lists.nsrca.org<br>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<o:p></o:p></span></font></p>
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