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<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'>This was the briefing at the world championship a couple of
years ago.<span style='mso-spacerun:yes'> </span>If it’s not a barrel roll and
not an axial roll, it’s probably a snap.<span style='mso-spacerun:yes'>
</span>My guess is there were few if any 0’s on snaps in the semi-finals and
finals in this contest.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'>Here’s my problem.<span style='mso-spacerun:yes'> </span>Let’s
say the maneuver is 45 downline snap.<span style='mso-spacerun:yes'>
</span>The pilot flies a small radius into the maneuver, a short line then the
snap.<span style='mso-spacerun:yes'> </span>Let’s say the snap is
textbook.<span style='mso-spacerun:yes'> </span>The judges look down and write
the score.<span style='mso-spacerun:yes'> </span>I can only assume it’s a
10.<span style='mso-spacerun:yes'> </span>Now continuing on, the line after
the snap is long and the last radius is very smooth and large.<span
style='mso-spacerun:yes'> </span>The judges didn’t see those elements so again
I can only assume they awarded a 10 for the maneuver that is in reality a 6 to
8.<span style='mso-spacerun:yes'> </span><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'>It’s too bad the major contest often revolve around how the
snaps are scored and many times disregarding the other elements of the maneuver.<span
style='mso-spacerun:yes'> </span>Maybe the world championship briefing should
be the criteria everyone uses and should be the textbook definition.<span
style='mso-spacerun:yes'> </span>Let your FAI rep know.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'>Don<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;mso-bidi-font-family:"Times New Roman";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
mso-fareast-font-family:"Times New Roman"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:
"Times New Roman"'> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>chris
moon<br>
<b>Sent:</b> Monday, June 16, 2008 5:13 PM<br>
<b>To:</b> nsrca-discussion@lists.nsrca.org<br>
<b>Subject:</b> Re: [NSRCA-discussion] Snap entry in FAI<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"'>Continuing:<br>
<br>
We can all agree what a loop looks like and all agree what an axial roll <br>
looks like right? The problems begin when we get into the "stalled" <br>
maneuvers -stalls, snaps,spins. Different planes behave and "look" <br>
differently in the stall therefore there cannot be one standard
"look" <br>
for these maneuvers. Intuitively we know that different designs have <br>
different airfoils and each plane has different wing loadings depending <br>
on their weight and will stall differently. Back to aerodynamics 101 we <br>
know that a wing stalls when you exceed it's critical angle of attack <br>
and this angle does not change as far as that wing is concerned. <br>
Different wings will of course have differing critical angles of attack <br>
before they stall. So, differing wings designs must look differently as <br>
they will reach critical angle at different times. The only thing that <br>
changes is the speed at which the wing will stall if you try to maintain <br>
level flight while reducing it's airspeed. So, does a plane need to <br>
depart from it's original flight path to stall? NO. It just needs to <br>
pivot around the c/g to take the wing past it's critical angle of <br>
attack. The c/g of the airplane can absolutely maintain it's track <br>
through the air. The speed of the rotation in a snap or spin will <br>
depend on the airfoil and amount of control throws used as well as c/g <br>
but the key is that you do not have to leave your c/g track through the <br>
air to stall the wing. Period. Same for stalls at the entry to spins - <br>
you can fly level and reduce airspeed while increasing pitch until you <br>
bring the wing to and past it's critical angle of attack. This may be <br>
15-20 degrees of nose up attitude - not some false 40-45 degree pitch up <br>
designed to "show" the stall. Both wings are stalled and should count
<br>
as stalled. Period. They may look differently, but both are stalled and <br>
correct. We need to get away from what "looks" right in a stalled
maneuver.<br>
<br>
Chris<br>
<br>
fire away.......<br>
<br>
chris moon wrote:<br>
> George - you have made an excellent point in that the interval may by<br>
> "minuscule" and not overly noticeable to everyone. It is
absolutely<br>
> wrong for some to claim that you must "show" them as judge an<br>
> exaggerated pitch up just to satisfy a personal interpretation of the<br>
> maneuver. Just as is is absolutely wrong for those judges to demand<br>
> another overly exaggerated pitch up as a stall entry to a spin<br>
> maneuver. It is never the job of the participant to exaggerate a<br>
> portion of a maneuver just to prove it exists, therefore your usage of<br>
> the term "minuscule" in terms of the time interval between pitch
and<br>
> rotation is something we need to keep in mind.<br>
><br>
> Chris<br>
><br>
> george w. kennie wrote:<br>
>> My lip is becoming too painful from biting it, so I think I'm going to<br>
>> stick my nose in here somewhere.<br>
>> I think I'm with Jon on this one.<br>
>> My logic, however flawed, tells me that if I am flying my plane<br>
>> straight and level and I input rudder, no matter how much, there is no<br>
>> way that this input will induce a stall to the airframe. Therefore, it<br>
>> seems to me, that the necessary force required to stall the main<br>
>> lifting surface must come from the elevator. It would further seem to<br>
>> me that this input must, by it's very nature produce a pitching<br>
>> attitude to the fuselage whether positive or negative. So I would have<br>
>> to conclude that the attitude "break" referenced by the rule
can only<br>
>> refer to a "pitch" break and would be impossible to confuse
with an<br>
>> attitude change induced by the rudder seeing that the required result<br>
>> is to stall the main wing.<br>
>> And yes Jon, I agree that it would be necessary to lead with the<br>
>> elevator in order to bring about this attitude change before rotation<br>
>> is started, however miniscule the interval might be.<br>
>> Of course I'm still open to hearing other interpretations and their<br>
>> validations as these observations are strictly opinions.<br>
>> G.<br>
>><br>
>> ----- Original Message -----<br>
>> *From:* Jon Lowe<br>
>> *To:* nsrca-discussion@lists.nsrca.org<br>
>><br>
>> *Sent:* Monday, June 16, 2008 2:10 PM<br>
>> *Subject:* Re: [NSRCA-discussion] Snap entry in FAI<br>
>><br>
>> Jim,<br>
>><br>
>> I have no clue how you think all three axes can be initiated at<br>
>> the same time. You keep forgetting the part of the RULE, quoted<br>
>> verbatim below, that says the "fuselage break and separation from<br>
>> the flight path" must happen "BEFORE THE ROTATION IS
STARTED". I'm<br>
>> NOT equating fueselage break to pitch break, it could break in<br>
>> pitch and/or yaw, if it doesn't start rotation at the same time.<br>
>> If you initiate all three axis at the same time, rotation WILL<br>
>> start at the same instant, and that is specifically NOT permitted.<br>
>> READ THE RULE! The judge MUST determine if the fuselage broke and<br>
>> separated from the flight path first, BEFORE the rotation started.<br>
>> If it didn't, he MUST severely downgrade.<br>
>><br>
>><br>
>> Jon Lowe<br>
>><br>
>><br>
>> -----Original Message-----<br>
>> From: Woodward, Jim (US SSA)<br>
>> To: General pattern discussion<br>
>> Sent: Mon, 16 Jun 2008 12:37 pm<br>
>> Subject: Re: [NSRCA-discussion] Snap entry in FAI<br>
>><br>
>> Jon,<br>
>><br>
>> I’m shocked - you are totally wrong here. Do not equate “fuselage”<br>
>> to “pitch” in the reading of this definition. As a judge you<br>
>> should NOT apply a “pitch-assessment” pass/fail criteria to<br>
>> judging FAI snap rolls. It is completely rejected. The plane and<br>
>> therefore “fuselage” must autorotate about the flight axis, which<br>
>> means that the nose and tail of the plane will move in a conical<br>
>> fashion. The pilot can initiate with all 3 axis at one time.<br>
>><br>
>> It is the responsibility of the judge to determine if autorotation<br>
>> occurred, and not determine how or in what order the pilot did it.<br>
>><br>
>> Thanks,<br>
>> Jim<br>
>>
------------------------------------------------------------------------<br>
>> *From:* nsrca-discussion-bounces@lists.nsrca.org<br>
>><br>
>> [mailto:nsrca-discussion-bounces@lists.nsrca.org<br>
>> ] *On Behalf Of<br>
>> *Jon Lowe<br>
>> *Sent:* Monday, June 16, 2008 1:21 PM<br>
>> *To:* nsrca-discussion@lists.nsrca.org<br>
>><br>
>> *Subject:* Re: [NSRCA-discussion] Snap entry in FAI<br>
>> You are correct, as long as there is no roll induced at the same<br>
>> instant. I overlooked that possibility. Not sure how rudder alone<br>
>> will induce the "supposed to be in a stalled condition"
though!!<br>
>> There are many attitudes (e.g. 45 down on center) where a judge<br>
>> could not likely see a rudder departure alone first, and thus<br>
>> conclude that departure did not occur before the roll departure<br>
>> started. And a judge might also not see a pitch departure first on<br>
>> a end box upline snap, but he could see rudder first. It is VERY<br>
>> clear that simultaneous roll with either or both of the other axes<br>
>> departures is NOT allowed as others have tried to state here. I<br>
>> did say that pitch and yaw departure could happen simutaneously,<br>
>> in my original post, as long as roll doesn't occur at the same time.<br>
>> Jon Lowe<br>
>><br>
>><br>
>> -----Original Message-----<br>
>> From: JShulman><br>
>> To: General pattern discussion<br>
>>><br>
>> Sent: Mon, 16 Jun 2008 11:22 am<br>
>> Subject: Re: [NSRCA-discussion] Snap entry in FAI<br>
>> Jon,<br>
>> I don't see where it says pitch break? Rudder first will show<br>
>> attitude break and separation from the flight path. So if one uses<br>
>> rudder and elevator first this is also correct.<br>
>> Regards,<br>
>> Jason<br>
>> www.jasonshulman.com<br>
>> www.shulmanaviation.com<br>
>> www.composite-arf.com<br>
>><br>
>> -----Original Message-----<br>
>> *From:* nsrca-discussion-bounces@lists.nsrca.org<br>
>><br>
>> [mailto:nsrca-discussion-bounces@lists.nsrca.org<br>
>> ]*On Behalf<br>
>> Of *Jon Lowe<br>
>> *Sent:* Monday, June 16, 2008 12:11 PM<br>
>> *To:* nsrca-discussion@lists.nsrca.org<br>
>><br>
>> *Subject:* Re: [NSRCA-discussion] Snap entry in FAI<br>
>> I suggest people re-read the definition ofsnap-rolls from the<br>
>> FAI sporting code. I did a few minutes ago. Here it is:<br>
>> "5B.7.5. *SNAP-ROLLS*<br>
>> A snap-roll (or flick roll/rudder roll) is a rapid<br>
>> autorotative roll where the model aircraft is in a stalled<br>
>> attitude, with a continuous high angle of attack<br>
>> Snap-rolls have the same judging criteria as axial rolls as<br>
>> far as start and stop of the rotation, and<br>
>> constant flight path through the manoeuvre is concerned.<br>
>> At the start of a snap-roll, the fuselage attitude must show a<br>
>> definite break and separation from the<br>
>> flight path, before the rotation is started, since the model<br>
>> aircraft is supposed to be in a stalled<br>
>> condition throughout the manoeuvre, If the stall/break does<br>
>> not occur and the model aircraft barrelrolls<br>
>> around, the manoeuvre must be severely downgraded (more than 5<br>
>> points). Similarly, axial<br>
>> rolls disguised as snap-rolls must be severely downgraded<br>
>> (more than 5 points).<br>
>> Snap-rolls can be flown both positive and negative, and the<br>
>> same criteria apply. The attitude<br>
>> (positive or negative) is at the competitor’s discretion. If<br>
>> the model aircraft returns to an unstalled<br>
>> condition during the snap-roll, the manoeuvre is severely<br>
>> downgraded using the 1 point/15 degree<br>
>> rule."<br>
>><br>
>> Note that "the fuselage attitude must show a definite break<br>
>> and separation from the flight path, before the rotation is<br>
>> started..." That means that simultaneous pitch and rotation is<br>
>> specifically NOT permitted. I would interpret it as meaning<br>
>> that pitch and yaw could theoretically happen simultaneously,<br>
>> as long as no roll is involved. Sorry Matt, the rules as<br>
>> written do NOT allow actuation in all three axes<br>
>> simultaneously. The rule also states that a constant flight<br>
>> path has to be maintained.<br>
>><br>
>> Let's face it, the only way to prevent severe downgrading from<br>
>> EVERY judge, not just some judges, is to have a pitch break<br>
>> first. Takes any question away.<br>
>> Jon Lowe<br>
>><br>
>><br>
>> -----Original Message-----<br>
>> From: rcmaster199@aol.com<br>
>> To: nsrca-discussion@lists.nsrca.org<br>
>><br>
>> Sent: Mon, 16 Jun 2008 10:46 am<br>
>> Subject: Re: [NSRCA-discussion] Snap entry in FAI<br>
>> A "Flick" and a "Snap" roll are the same roll in
full scale<br>
>> aerobatics parlance and reference material.<br>
>><br>
>> Do these mean the same thing in model aerobatics? In my view,<br>
>> they do<br>
>><br>
>> The latest FAI regs allow actuation of the three main axes<br>
>> simultaneously...that is, the regs don't specifically<br>
>> differentiate "Pitch Break" from other deviations. I don't<br>
>> think they specifically require that the model must rotate<br>
>> about it's flight path either, I don't believe (.....plane<br>
>> must rotate in a conical fashion about the fight axis....).<br>
>> The model would probably present the best if that's done, so<br>
>> pilots may want to consider that when executing the maneuver.<br>
>><br>
>> In my take, a rapid Pitch is desired to preload the wing.<br>
>> Contrary to popular belief, both panels dot not have to stall<br>
>> for a snap to occur. Quite the opposite. Upon rudder<br>
>> deflection, the port panel will practically stall (lift much<br>
>> much less than the other panel) but the starboard panel must<br>
>> be lifting to create the autorotation. If both panels stall,<br>
>> the model will fall out of the sky for a distance and a snap<br>
>> would not occur at the correct moment in time<br>
>><br>
>> MattK<br>
>><br>
>> -----Original Message-----<br>
>> From: Woodward, Jim (US SSA)<br>
>>><br>
>> To: General pattern discussion<br>
>><br>
>>><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<br>
>> rule<br>
>> reads, "... fuselage attitude must show a definite break and<br>
>> separation<br>
>> from the flight path."<br>
>><br>
>> It does not say, "MUST SHOW PITCH BREAK." Please DO NOT<br>
>> ERROUNIOUSLY<br>
>> APPLY A PASS/FAIL MAJOR DEDUCTION initial assessment to the<br>
>> snap roll.<br>
>> Watch the whole maneuver then render your score.<br>
>><br>
>> A break and separation from the flight path simply means that<br>
>> the nose<br>
>> and tail of the plane must rotate in a conical fashion about<br>
>> the fight<br>
>> axis. Yaw, roll, and pitch can all break at the same moment if<br>
>> that is<br>
>> how the pilot does it.<br>
>><br>
>> Hey :) some really handsome smart guy wrote some stuff at this<br>
>> link<br>
>> below about snap rolls to help clarify how they are done in IMAC.<br>
>><br>
>> http://www.mini-iac.com/DesktopDefault.aspx?tabid=77<br>
>><br>
>> thanks,<br>
>> Jim<br>
>><br>
>><br>
>> _______________________________________________<br>
>> NSRCA-discussion mailing list<br>
>> NSRCA-discussion@lists.nsrca.org<br>
>><br>
>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
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