[NSRCA-discussion] Snap entry in FAI
James Oddino
joddino at socal.rr.com
Mon Jun 16 09:57:43 AKDT 2008
On the 14MZ the sticks still work when you apply the snap switch.
Thus one can pull the elevator before hitting the snap switch and more
importantly can put in some down elevator before releasing the
switch. In addition you can slow down the aileron in and out so it
kind of lags the rudder and aileron and slow down the rudder out so it
will help correct the heading on a positive one and a half.
Jim O
On Jun 16, 2008, at 10:35 AM, John Pavlick wrote:
> So then... how can you expect to score a perfect 10 if you use snap
> roll switches? :)
>
> John Pavlick
>
> Jon Lowe <jonlowe at aol.com> wrote:
> You are correct, as long as there is no roll induced at the same
> instant. I overlooked that possibility. Not sure how rudder alone
> will induce the "supposed to be in a stalled condition" though!!
> There are many attitudes (e.g. 45 down on center) where a judge
> could not likely see a rudder departure alone first, and thus
> conclude that departure did not occur before the roll departure
> started. And a judge might also not see a pitch departure first on
> a end box upline snap, but he could see rudder first. It is VERY
> clear that simultaneous roll with either or both of the other axes
> departures is NOT allowed as others have tried to state here. I
> did say that pitch and yaw departure could happen simutaneously, in
> my original post, as long as roll doesn't occur at the same time.
>
> Jon Lowe
>
>
> -----Original Message-----
> From: JShulman <jshulman at cfl.rr.com>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Mon, 16 Jun 2008 11:22 am
> Subject: Re: [NSRCA-discussion] Snap entry in FAI
>
> Jon,
>
> I don't see where it says pitch break? Rudder first will show
> attitude break and separation from the flight path. So if one uses
> rudder and elevator first this is also correct.
>
> Regards,
> Jason
> www.jasonshulman.com
> www.shulmanaviation.com
> www.composite-arf.com
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org
> ]On Behalf Of Jon Lowe
> Sent: Monday, June 16, 2008 12:11 PM
> To: nsrca-discussion at lists.nsrca.org
> Subject: Re: [NSRCA-discussion] Snap entry in FAI
>
> I suggest people re-read the definition ofsnap-rolls from the FAI
> sporting code. I did a few minutes ago. Here it is:
>
> "5B.7.5. SNAP-ROLLS
> A snap-roll (or flick roll/rudder roll) is a rapid autorotative roll
> where the model aircraft is in a stalled
> attitude, with a continuous high angle of attack
> Snap-rolls have the same judging criteria as axial rolls as far as
> start and stop of the rotation, and
> constant flight path through the manoeuvre is concerned.
> At the start of a snap-roll, the fuselage attitude must show a
> definite break and separation from the
> flight path, before the rotation is started, since the model
> aircraft is supposed to be in a stalled
> condition throughout the manoeuvre, If the stall/break does not
> occur and the model aircraft barrelrolls
> around, the manoeuvre must be severely downgraded (more than 5
> points). Similarly, axial
> rolls disguised as snap-rolls must be severely downgraded (more than
> 5 points).
> Snap-rolls can be flown both positive and negative, and the same
> criteria apply. The attitude
> (positive or negative) is at the competitor’s discretion. If the
> model aircraft returns to an unstalled
> condition during the snap-roll, the manoeuvre is severely downgraded
> using the 1 point/15 degree
> rule."
>
> 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.
>
> 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.
>
> Jon Lowe
>
>
> -----Original Message-----
> From: rcmaster199 at aol.com
> To: nsrca-discussion at lists.nsrca.org
> Sent: Mon, 16 Jun 2008 10:46 am
> Subject: Re: [NSRCA-discussion] Snap entry in FAI
>
> A "Flick" and a "Snap" roll are the same roll in full scale
> aerobatics parlance and reference material.
>
> Do these mean the same thing in model aerobatics? In my view, they do
>
> 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.
>
> 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
>
> MattK
>
> -----Original Message-----
> From: Woodward, Jim (US SSA) <jim.woodward at baesystems.com>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Mon, 16 Jun 2008 8:47 am
> Subject: Re: [NSRCA-discussion] Snap entry in FAI
>
> Guys,
>
> I thought the FAI changes explicitly allowed flick rolls? The rule
> reads, "... fuselage attitude must show a definite break and
> separation
> from the flight path."
>
> It does not say, "MUST SHOW PITCH BREAK." Please DO NOT ERROUNIOUSLY
> APPLY A PASS/FAIL MAJOR DEDUCTION initial assessment to the snap roll.
> Watch the whole maneuver then render your score.
>
> A break and separation from the flight path simply means that the nose
> and tail of the plane must rotate in a conical fashion about the fight
> axis. Yaw, roll, and pitch can all break at the same moment if that is
> how the pilot does it.
>
> Hey :) some really handsome smart guy wrote some stuff at this link
> below about snap rolls to help clarify how they are done in IMAC.
>
> http://www.mini-iac.com/DesktopDefault.aspx?tabid=77
>
> thanks,
> Jim
>
>
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