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<DIV><FONT face=Arial size=2>John</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I've not come to any conclusions regarding hinge
line angle either, perpendicular to the fuse seems OK. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I do find it interesting that small elevators tend
to be more sensitive around neutral than larger elevators. I've experimented
with changing the elevator size on several airplanes. In all cases the smaller
the elevator, the more sensitive around neutral (not necessarily more total
authority). The most dramatic demonstration was an airplane with a flying
stab arrangement that was numb around neutral and became "normal" with
conventional stab / elevators. In fact, most fun-fli (3D) airplanes are quite
tame around neutral with pattern type control systems/ travels while having huge
elevators. One interesting aspect of moving the hinge line on the same airplane
to effect elevator size is that it also changes the pitch control moment arm,
however this seems too small to influence "feel". </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Of course "feel" is very subjective. I've flown a
couple of Quique's designs with his recommenced control travels and find that
the feel he's comfortable with is more sensitive than I prefer. I suspect his
thumb resolution is 2048 while us mere mortals are still 512 (and getting
coarser with age)! </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Earl</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=johnferrell@earthlink.net
href="mailto:johnferrell@earthlink.net">John Ferrell</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, November 15, 2004 9:44
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Elevators on PL models
(still)</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I have given some thought to the hinge line
angles but I can never reason it out to my satisfaction.</FONT></DIV>
<DIV><FONT face=Arial size=2>If you would sweep the hinge line forward I would
think it to be a little like adding toe in on an automobile. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>A little squeeze on the centerline might be a
good thing. On the other hand, you are dealing with spanwise flow on the
control surface as well. It is easier to think about if you make the control
surface rectangular, with the hinge line and the trailing edge parallel. But
that is definitely not the best way to build a "stiff" elevator.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I always put the whole question back on the shelf
because I cannot think of any way to evaluate the different examples. I will
never have the flying skills to do it myself and I really don't know what I
would be looking for. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I find it easier for me to understand
characteristics by considering what a given model does or does not do well and
look for the underlying flying cause/effect relationship.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Please keep us advised of your
experiences!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>John Ferrell <BR>My Competition is not my enemy! <BR><A
href="http://DixieNC.US">http://DixieNC.US</A><BR></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Tom.Koenig@actewagl.com.au
href="mailto:Tom.Koenig@actewagl.com.au">Koenig, Tom</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">Discussion</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, November 14, 2004 4:59
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Elevators on PL models
(still)</DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial
size=2></FONT><BR></DIV><!-- Converted from text/rtf format -->
<P><FONT face="Comic Sans MS">Hi again all,</FONT> </P>
<P><FONT face="Comic Sans MS">Sorry to rabbit on about this, but I have some
more questions...or should that be, seeking ideas. I realise that I am
probably getting caught up on something that really doesn't matter ...but
here goes anyway.</FONT></P>
<P><FONT face="Comic Sans MS">Like I said in an earlier post..I will simply
build two sets of stabs and see for myself...but I cant help trying to get
inside Quique's or the Matt's head on this one. Or should that perhaps be
Monsieur Lemmonier?</FONT></P>
<P><FONT face="Comic Sans MS">On the weekend, I realised I made a small
measurement error, when reverse engineering the plan form of the stabs. I
can live with the fact that they arrived at a small elevator design, but I
can see no relationship other than area.</FONT></P>
<P><FONT face="Comic Sans MS">What has me rattled is that the hinge line of
the elevators is swept forward....on both the Lazulite and the Partner,
there is no relationship between chord percentages, the area's kind of work
out..but how did they arrive at the distribution???</FONT></P>
<P><FONT face="Comic Sans MS">So I assumed that they jigged the stabs up
wrong when boring the stab tube hole..but this appears to not be the case,
as the root( fuz) angles are correct. So I looked at the aileron hinge line
angle to see if there is a relationship there, but there appears not.
</FONT></P>
<P><FONT face="Comic Sans MS">On elevators, I have either always used chord
percentages or placed the hinge line square to the Fuz CL, with great
success. Using ( even) chord percentages results in a hinge line being swept
back...not forward ( depending on plan form ofcourse)</FONT></P>
<P><FONT face="Comic Sans MS">So does anyone out there talk to Quique? Could
someone ask him about this?</FONT> <BR><FONT face="Comic Sans MS"> As
the once famous Professor Julius Summner Miller said..'why is this so'? Did
they make half a dozen stabs and try them empirically. I have not seen a
Smaragd..did it have a square hinge line? </FONT></P>
<P><FONT face="Comic Sans MS">My limited knowledge has me baffled on this
one...its not that important...I just want to know why!</FONT> </P>
<P><FONT face="Comic Sans MS">Thank you again to all of you who have
contributed to this one.</FONT> </P>
<P><FONT face="Comic Sans MS">best regards</FONT> </P>
<P><FONT face="Comic Sans MS">(curious) Tom</FONT> </P>
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