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<DIV dir=ltr align=left><SPAN class=467281816-16062008><FONT face=Arial
color=#0000ff size=2>define--definite? does that mean huge? This isn't rocket
science...LOL</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=467281816-16062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=467281816-16062008><FONT face=Arial
color=#0000ff size=2>gary</FONT></SPAN></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of </B>Jon
Lowe<BR><B>Sent:</B> Monday, June 16, 2008 11:11 AM<BR><B>To:</B>
nsrca-discussion@lists.nsrca.org<BR><B>Subject:</B> Re: [NSRCA-discussion] Snap
entry in FAI<BR></FONT><BR></DIV>
<DIV></DIV>I suggest people re-read the definition ofsnap-rolls from the
FAI sporting code. I did a few minutes ago. Here it is:<BR><BR><FONT
face=Arial size=2>
<DIV align=left>"5B.7.5. </FONT><B><FONT face=Arial
size=2>SNAP-ROLLS</DIV></B></FONT><FONT face=Arial size=2>
<DIV align=left>A snap-roll (or flick roll/rudder roll) is a rapid autorotative
roll where the model aircraft is in a stalled</DIV>
<DIV align=left>attitude, with a continuous high angle of attack</DIV>
<DIV align=left>Snap-rolls have the same judging criteria as axial rolls as far
as start and stop of the rotation, and</DIV>
<DIV align=left>constant flight path through the manoeuvre is concerned.</DIV>
<DIV align=left>At the start of a snap-roll, the fuselage attitude must show a
definite break and separation from the</DIV>
<DIV align=left>flight path, before the rotation is started, since the model
aircraft is supposed to be in a stalled</DIV>
<DIV align=left>condition throughout the manoeuvre, If the stall/break does not
occur and the model aircraft barrelrolls</DIV>
<DIV align=left>around, the manoeuvre must be severely downgraded (more than 5
points). Similarly, axial</DIV>
<DIV align=left>rolls disguised as snap-rolls must be severely downgraded (more
than 5 points).</DIV>
<DIV align=left>Snap-rolls can be flown both positive and negative, and the same
criteria apply. The attitude</DIV>
<DIV align=left>(positive or negative) is at the competitor’s discretion. If the
model aircraft returns to an unstalled</DIV>
<DIV align=left>condition during the snap-roll, the manoeuvre is severely
downgraded using the 1 point/15 degree</DIV>
<DIV align=left>rule."<BR></DIV></FONT><BR>Note that "the fuselage attitude must
show a definite break and separation from the flight path, before the rotation
is started..." That means that simultaneous pitch and rotation is
specifically NOT permitted. I would interpret it as meaning that pitch and
yaw could theoretically happen simultaneously, as long as no roll is
involved. Sorry Matt, the rules as written do NOT allow actuation in all
three axes simultaneously. The rule also states that a constant flight
path has to be maintained.<BR><BR>Let's face it, the only way to prevent severe
downgrading from EVERY judge, not just some judges, is to have a pitch break
first. Takes any question away.<BR><BR>
<DIV style="CLEAR: both">Jon Lowe</DIV><BR><BR>-----Original
Message-----<BR>From: rcmaster199@aol.com<BR>To:
nsrca-discussion@lists.nsrca.org<BR>Sent: Mon, 16 Jun 2008 10:46 am<BR>Subject:
Re: [NSRCA-discussion] Snap entry in FAI<BR><BR>
<DIV id=AOLMsgPart_0_f4e18038-9d63-45d9-87c7-a93410402f63
style="FONT-SIZE: 12px; MARGIN: 0px; COLOR: #000; FONT-FAMILY: Tahoma, Verdana, Arial, Sans-Serif; BACKGROUND-COLOR: #fff">A
"Flick" and a "Snap" roll are the same roll in full scale aerobatics parlance
and reference material. <BR> <BR>Do these mean the same thing in model
aerobatics? In my view, they do <BR> <BR>The latest FAI regs allow
actuation of the three main axes simultaneously...that is, the regs don't
specifically differentiate "Pitch Break" from other deviations. I don't think
they specifically require that the model must rotate about it's flight path
either, I don't believe (.....plane must rotate in a conical fashion about the
fight axis....). The model would probably present the best if that's done, so
pilots may want to consider that when executing the
maneuver. <BR> <BR>In my take, a rapid Pitch is desired to preload the
wing. Contrary to popular belief, both panels dot not have to stall for a snap
to occur. Quite the opposite. Upon rudder deflection, the port panel will
practically stall (lift much much less than the other panel) but the starboard
panel must be lifting to create the autorotation. If both panels stall, the
model will fall out of the sky for a distance and a snap would not occur at the
correct moment in time <BR> <BR>MattK <BR> <BR>-----Original
Message----- <BR>From: Woodward, Jim (US SSA) <<A
href="mailto:jim.woodward@baesystems.com">jim.woodward@baesystems.com</A>> <BR>To:
General pattern discussion <<A
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>> <BR>Sent:
Mon, 16 Jun 2008 8:47 am <BR>Subject: Re: [NSRCA-discussion] Snap entry in
FAI <BR> <BR>Guys, <BR> <BR>I thought the FAI changes
explicitly allowed flick rolls? The rule <BR>reads, "... fuselage attitude
must show a definite break and separation <BR>from the flight
path." <BR> <BR>It does not say, "MUST SHOW PITCH BREAK." Please DO
NOT ERROUNIOUSLY <BR>APPLY A PASS/FAIL MAJOR DEDUCTION initial assessment
to the snap roll. <BR>Watch the whole maneuver then render your
score. <BR> <BR>A break and separation from the flight path simply
means that the nose <BR>and tail of the plane must rotate in a conical
fashion about the fight <BR>axis. Yaw, roll, and pitch can all break at the
same moment if that is <BR>how the pilot does it. <BR> <BR>Hey :)
some really handsome smart guy wrote some stuff at this link <BR>below
about snap rolls to help clarify how they are done in
IMAC. <BR> <BR><A
href="http://www.mini-iac.com/DesktopDefault.aspx?tabid=77"
target=_blank>http://www.mini-iac.com/DesktopDefault.aspx?tabid=77</A> <BR> <BR>thanks, <BR>Jim <BR> <BR> <BR>_______________________________________________ <BR>NSRCA-discussion
mailing list <BR><A
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</A> <BR><A
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A> <BR></DIV><!-- end of AOLMsgPart_0_f4e18038-9d63-45d9-87c7-a93410402f63 -->
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