[NSRCA-discussion] Snap in AMA

[Jon Lowe]

Ok, good discussion point.? The first part of that rule says:
?
"A Snap roll is a simultaneous, rapid

autorotation in the pitch, yaw and roll axes of

flight in a stalled wing attitude."


Note the word "simultaneous".? 

The next part of the rule states:
"
1. Since the maneuver is defined as a
stalled maneuver, initiated by a stall of

the wing induced by a rapid change in

pitch attitude, the nose of the fuselage

must show a definite break in pitch

attitude from the flight path in the

direction of the snap (positive or

negative) while the track closely

maintains the flight path. The lack of a

discernable pitch break is downgraded

by 5 points." 

Note that it does NOT state that the definite pitch break has to happen FIRST.? It just says that a definite pitch?break has to happen, and going by the first part of the definition, departure in all three axis can happen simultaneously.? I think that a lot of judges are thinking that the pitch break in AMA snaps has to happen first, but the rule doesn't say that.

. Since the maneuver is defined as a
stalled maneuver, initiated by a stall of

the wing induced by a rapid change in

pitch attitude, the nose of the fuselage

must show a definite break in pitch

attitude from the flight path in the

direction of the snap (positive or

negative) while the track closely

maintains the flight path. The lack of a

discernable pitch break is downgraded

by 5 points." 

Note that it does NOT state that the definite pitch break has to happen FIRST.? It just says that a definite pitch?break has to happen, and going by the first part of the definition, departure in all three axis can happen simultaneously.? I think that a lot of judges are thinking that the pitch break in AMA snaps has to happen first, but the rule doesn't say that.



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 11:54 am
Subject: [NSRCA-discussion] Snap in AMA



http://www.modelaircraft.org/events/rulebooks/RC%20Aerobatics.pdf

Starting on page 20 (downgrades start on page 18). Since we aren't all going to 
judge FAI at the Nats, we should probably know both
FAI and AMA rules.

Regards,
Jason
www.jasonshulman.com
www.shulmanaviation.com
www.composite-arf.com

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