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<DIV><FONT face=Arial color=#0000ff size=2>If you are referring to flaps per
full scale look at where flaps are located on the wing. Why are they
located there? To allow and contribute to the loss of lift at root of the
wing but to still allow for stability and lifting airflow to continue over the
outer wing panels. </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2> </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2>At the wing loadings and air speeds
our aerobatic models fly at (referring to 2m in this case) at best we can
accomplish is to create a high speed wing stall or at least force
a snap with massive deflections of our surfaces. </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2> </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2>Myself, unless someone can show with
wing tunnel studies or tuft video analysis that the wing is truly stalled,
I believe many models truly do not have a stalled wing condition. If they did,
they would display a change in track that would be easily detectable d/t the AOA
and transition to high speed stall. It doesn't occur instantly unless
already in or approaching a stalled state. </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2> </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2>
Del</FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">General pattern discussion</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, June 30, 2008 8:22 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Snap
entry in FAI</DIV>
<DIV><BR></DIV>
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<P>When a wing stalls, it simply means the airflow detaches from the top
of the wing. The air is still flowing on the bottom of the wing, the
wing is still providing some lift, and the ailerons can still deflect
this flow. If this was not the case, a rolling harrier would not be
possible. (Shame on me for mentioning 3D flying on a precision
aerobatics newslist!! :-) )</P>
<P> </P>
<P>Deflecting the aileron down will not necessarily cause the wing
to stall quicker, in fact as the wing starts to move up (roll rotation)
the angle of attack is actually decreased on the rising wing, and
increased on the falling wing. This is how one wing panel can be stalled
and not the other.</P>
<P> </P>
<P>Besides, if deflecting the trailing edge down causes a wing to stall
quicker, I don't think flaps would be a good idea on a landing approach.
</P>
<P><BR><BR>Bob R</P>
<P><BR><BR>--- On <B>Mon, 6/30/08, Del
<I><drykert2@rochester.rr.com></I></B> wrote:<BR></P>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid">
<DIV id=yiv929548203>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">I
would like someone to explain how, if the wing, or one panel, is
stalled how the ailerons are continuing to control the direction of
rotation. If there is a stalled wing, then it will be the one with
the "down" aileron as that wing has the higher incidence angle. This
stalled panel would cause a roll contrary to the aileron deflection.
This is actually what happens when you get an oeverweight airplane
too slow and add some surface deflections. It will snap contrary to
the aileron.<BR><BR></BLOCKQUOTE></DIV><PRE>_______________________________________________
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