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<DIV><STRONG><FONT face="MS Sans Serif" color=#0000ff>Don.</FONT></STRONG></DIV>
<DIV><STRONG><FONT face="MS Sans Serif" color=#0000ff>
Thanks for tackling and giving what I consider a very accurate description and
analysis.</FONT></STRONG></DIV>
<DIV><STRONG><FONT face="MS Sans Serif"
color=#0000ff> </FONT></STRONG></DIV>
<DIV><STRONG><FONT face="MS Sans Serif"
color=#0000ff> Del K.
Rykert<BR> AMA - 8928 <BR> NSRCA
- 473<BR> Kb2joi - General </FONT></STRONG></DIV>
<DIV> </DIV>
<DIV><STRONG><FONT face="MS Sans Serif"
color=#0000ff></FONT></STRONG> </DIV>
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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=donramsey@cox-internet.com
href="mailto:donramsey@cox-internet.com">Don Ramsey</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> Wednesday, November 05, 2003 12:10
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: F3A - snap roll query</DIV>
<DIV><BR></DIV>Here's what I wrote for the KFactor about this
subject.<BR><BR><BR><BR>Snaps! Now there's a maneuver that causes some
heated discussion. Van<BR>Putte was asked at the NATS Pilot's Meeting if
a snap should be downgraded<BR>if it displaces from the line. He took
that question in stride and promptly<BR>handed it off to me. I tried to
pass it back to him and to Earl Haury but<BR>no one would answer. Well
my answer was, "It should not displace<BR>significantly from the flight path
for maximum points." I caught a lot of<BR>flack for that answer but I
believe it is correct. How did I come to<BR>believe this? Here's
what the Competition Regulations say about snaps.<BR><BR><BR><BR>Snaps - A
Snap is a simultaneous, rapid autorotation in the pitch, yaw and<BR>roll axis
of flight in a stalled wing attitude. The following
criteria<BR>apply:<BR><BR> 1.. Since the maneuver is defined as a stall
maneuver (initiated by a<BR>rapid stall of the wing induced by a change in
pitch attitude), the nose of<BR>the fuselage should show a definite break from
the flight path in the<BR>direction of the snap (positive or negative) while
the track closely<BR>maintains the flight path. The track visualized as the
path of the Center of<BR>Gravity (CG) should ideally follow the geometric
flight path of the maneuver<BR>while the nose and tail autorotate through
opposite helical arcs around the<BR>flight path. A snap that does not show a
break and stall to initiate the<BR>snap, but does enter a stalled attitude
during the maneuver is severely<BR>downgraded.<BR> 2.. If the stall does
not occur and the model barrel- rolls around, the<BR>maneuver is zeroed.
A barrel roll can be identified when the CG, the nose<BR>and tail scribe the
same helical path through the required rotation of the<BR>maneuver.<BR>
3.. Snap rolls have the same judging criteria as axial rolls as far
as<BR>start and stop of rotation, constant flight path through the maneuver,
and<BR>rate are concerned.<BR> 4.. Snap rolls may be either positive or
negative.<BR> 5.. If the model returns to an unstalled condition during
the maneuver,<BR>such that the autorotation is not visible and the model rolls
to complete<BR>the maneuver, it would be severely downgraded.<BR> 6..
Airspeed is not criteria which should be used to judge this maneuver.<BR>As
the wing of the model is stalled during this maneuver a
significant<BR>decrease in speed may occur and is not a cause for
downgrade.<BR>There are several things to notice about snaps. >From #1
above, "the nose of<BR>the fuselage should show a definite break from the
flight path in the<BR>direction of the snap." You make the call here. If
you don't see the break,<BR>maybe it didn't happen. The last sentence in
#1 says, "A snap that does not<BR>show a break and stall to initiate the snap,
but does enter a stalled<BR>attitude during the maneuver is severely
downgraded."<BR><BR><BR><BR>How about displacing from the line? Again in
#1, ". while the track closely<BR>maintains the flight path. The track
visualized as the path of the Center of<BR>Gravity (CG) should ideally follow
the geometric flight path of the maneuver<BR>while the nose and tail
autorotate through opposite helical arcs around the<BR>flight path."
And, from #3, ".constant flight path through the
maneuver<BR> ..." That's where I got the answer, "It should
not displace significantly<BR>from the flight path for maximum
points."<BR><BR><BR><BR>So, my answer would be, there would be a downgrade
depending on the severity<BR>of the displacement but NOT a
zero.<BR><BR><BR><BR>Don Ramsey<BR><BR>NSRCA Judging Committee
Chairman<BR><BR><BR><BR><BR><BR>----- Original Message ----- <BR>From:
"PENNISI Peter" <<A
href="mailto:Peter.Pennisi@publicworks.qld.gov.au">Peter.Pennisi@publicworks.qld.gov.au</A>><BR>To:
<<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A>><BR>Sent:
Tuesday, November 04, 2003 7:58 PM<BR>Subject: F3A - snap roll
query<BR><BR><BR><BR>Hi Guys,<BR><BR>I recently read that any snap roll which
finishes higher than where it<BR>started should be zeroed automatically even
if the jump is slight. I am<BR>referring in particular to the 1-1/2<BR><BR>How
is this ruling being interpreted in your country. If this is the case
I<BR>will need to perform these snaps at very low speeds.<BR><BR>Given the
stability of our modern aircraft and the relatively long tail<BR>moments this
is not an easy
accomplishment.<BR><BR>Peter<BR><BR>***************************** Disclaimer
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