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<DIV><FONT face=Arial size=2>Spot-on
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</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=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> Tuesday, June 17, 2008 1:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Snap
entry in FAI</DIV>
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<P>A spin entry and a snap are two different beasts. </P>
<P> </P>
<P>For a spin entry, you must gradually slow the airplane down to the
stall speed while maintaining straight flight. As the plane slows, you
must gradually increase the angle of attack to keep the lift constant,
up until the point of the stall.</P>
<P> </P>
<P>For a snap, you don't have time to slow the airplane down, you must
initiate the snap at well above the stall speed. Any increase in angle
of attack from that which is necessary for level flight will result in a
corresponding increase in lift and will cause a deviation from a
straight path.</P>
<P> </P>
<P>Any manuever description that states the plane must stay on a
straight path during the autorotation is flawed, IMHO. The lift of the
wing does not drop to zero when it stalls. In fact, at the moment of the
stall, the wing is producing near maximum lift. And, keep in mind that
if done properly, the snap roll only has one wing panel stalled.</P>
<P> </P>
<P>I had someone shoot video of my flying, and in the video was a snap
roll flown straight toward the camera. I thought it was a pretty good
snap roll when I flew it. In looking at the slow motion video, it was
obvious the airplane was stalled and a snap roll was performed, but it
was also very obvious that the path of the plane was corkscrewed. The
entry and exit were on the same heading and altitude, but parallel, and
displaced by at least one wingspan. This would not have been so
obvious had the plane not been flown directly towards the camera.</P>
<P> </P>
<P>JM2CW.<BR><BR>Bob R<BR><BR>--- On <B>Mon, 6/16/08, Matthew Frederick
<I><mjfrederick@cox.net></I></B> wrote:<BR></P>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><PRE>It is entirely possible (and expected) that you can show a pitch change
without a deviation in the line of flight. It requires a reduction in
throttle combined with the application of elevator. If it wasn't possible
to
show a pitch change without changing the line of flight we would see some
horrible spin entries. Keep in mind, the snap and spin are essentially the
same maneuvers with different entry speeds. Doing a proper snap according to
the rules (both AMA and FAI from what I can see) is a matter of split-second
timing of the control inputs. Nothing more.
Matt
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