<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE></TITLE>
<META content=text/html;charset=ISO-8859-1 http-equiv=Content-Type>
<META content="MSHTML 5.00.2614.3500" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff text=#000000>
<DIV><FONT face=Arial size=2>"I've not seen this before in the modeling
world</FONT><FONT face=Arial size=2>"</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The asymmetric airfoiled vertical fin is pretty
common in free flight world. ed </FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A href="mailto:billglaze@triad.rr.com" title=billglaze@triad.rr.com>Bill
Glaze</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A href="mailto:discussion@nsrca.org"
title=discussion@nsrca.org>discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, January 31, 2005 8:10
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Composite-ARF Impact
question</DIV>
<DIV><BR></DIV>We agree that any airplane is in trim for a given set of
conditions existing at that time. As my primary instructor said: " the
rudder is a trimming device." (Perhaps a little too simplistic, but a
good starting point.)<BR>We are constantly looking for the perfect combination
that requires the least work from the pilot, to achieve the most precision of
results. Probably a matter of taste, largely.<BR>As I recall, this
thread started because of one flyer noticing the asymmetrical airfoil on his
new fuselage. While certainly not original in aviation, I must admit that I've
not seen this before in the modeling world. Or, probably, it's just that
I've not noticed it before. I sure hope he keeps us updated as to how it
works in the real world of modeling.<BR><BR>Bill Glaze<BR><BR>Bob Richards
wrote:
<BLOCKQUOTE type="cite"
cite="mid20050131025836.76120.qmail@web30207.mail.mud.yahoo.com">
<DIV>Bill,</DIV>
<DIV> </DIV>
<DIV>I don't think it is uncommon for full-scale planes to have offset or
asymmetrical fins. However, they are designed with the right amount *for
cruise*. Any other speed/power setting will change things. Since they are
after the most efficiency in cruise conditions (better range), they will
probably want the least amount of offset thrust as possible, and will trim
the rudder/fin accordingly. If they expect the fin to be providing a
constant yaw force, it would make sense to give it an asymmetrical airfoil
for the most efficiency. Let the pilots deal with the other
situations.</DIV>
<DIV> </DIV>
<DIV>I personally think the right-thrust is the correct way to go. I can't
argue with what others have said about throttle mix working for them, but I
don't see how it would work. I think you will have less slipstream effect
happening at full throttle in level flight than you would at full throttle
in a climb. As the prop unloads with increasing airspeed, the slipstream
effect should decrease.</DIV>
<DIV> </DIV>
<DIV>Of course, I remember the very detailed trim instructions that came
with my Great Planes Cap21. Something like: "Pull the nose up until pefectly
vertical. If the plane yaws off to the left, add weight to the right
wingtip". There was no mention ANYWHERE about engine thrust. Tossed that in
the trash. :-)</DIV>
<DIV> </DIV>
<DIV>Bob R.<BR><BR><B><I>Bill Glaze <A class=moz-txt-link-rfc2396E
href="mailto:billglaze@triad.rr.com"><billglaze@triad.rr.com></A></I></B>
wrote:</DIV>
<BLOCKQUOTE class=replbq
style="BORDER-LEFT: rgb(16,16,255) 2px solid; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">Adam:<BR>This
may be a little bit off the mark, but just a little bit. During <BR>WW2,
the Italian firm Fiat produced a very good series of fighters with
<BR>exactly the characteristics you mention, that is, an asymmetrical
<BR>fin/rudder airfoil. Seemed to work well for them; other nations
handled <BR>the problem differently.<BR>Bill
Glaze<BR><BR></BLOCKQUOTE><BR><BR>Bob Richards<BR><A
class=moz-txt-link-abbreviated
href="mailto:bob@toprudder.com">bob@toprudder.com</A><BR><A
class=moz-txt-link-freetext
href="http://www.toprudder.com">http://www.toprudder.com</A>
</BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>