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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'>The EU1 had a relatively short rudder and
fin, with the addition of a fairly big ventral strake into the bottom of the
rudder, so the asymmetry of the rudder was reduced (not as much side area aft
of the CG above the thrust line), reducing the need for right thrust. The
EU1 also had minimal side area below the thrustline ahead of the CG (also minimizing
the need for right thrust) as the bottom of the plane was pretty close to the
bottom of the spinner. The great big chins on so many of the modern
designs exacerbate the need for right thrust. The need for right thrust
is reduced on some of the modern electric designs as the chin is substantially
reduced – Beryll, Azurit, Bravo, for example.<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>Phil Spelt<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 24, 2009 7:51
AM<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]
FAT Rudder</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>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Bob,<br>
<br>
I would really appreciate a write-up on what causes the need for right thrust
(spiraling air stream from the prop hitting the rudder??), and what to do to
correct it. What was about the EU-1A that fixed it?<br>
<br>
Many thanks,<br>
<br>
At 07:18 AM 8/24/2009, you wrote:<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>For many years, the common explanation for right thrust was torque, and
many people still believe that. This is a case of misdiagnosis. If it is
properly diagnosed, a real fix is much more likely to happen, but doing so with
variable thrust is not, IMHO, the best way to fix it. It can be fixed
aerodynamically, but then you run into the "but it doesn't look cool"
syndrome.<o:p></o:p></span></font></p>
<p></x-sigsep><b><i><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;font-weight:bold;font-style:italic'><x-sigsep>--> </span></font></i></b><b><i><font
color=maroon face=Arial><span style='font-family:Arial;color:maroon;font-weight:
bold;font-style:italic'>There are only two types of aircraft -- fighters and
targets.<br>
<br>
</span></font></i></b>Phil Spelt, Webmaster & Past President, Knox County
Radio Control Society, Inc.<br>
URL: <a href="http://www.kcrctn.com/"
eudora=autourl>http://www.kcrctn.com<br>
</a>AMA--1294, Scientific Leader Member, SPA--177<br>
My URL: <a
href="http://mywebpages.comcast.net/~chuenkan/" eudora=autourl>http://mywebpages.comcast.net/~chuenkan/<br>
</a> (865) 435-1476 v (865) 604-0541 c <o:p></o:p></p>
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