[NSRCA-discussion] Judging the Snap

[Verne Koester]

In a barrel roll, the tail is rotating around a cylinder shape along with the rest of the plane. In that case the nose and tail are displacing in the same plane, or direction, if you will. 

In a snap, the exact opposite happens. The nose and tail are displacing in opposite directions, hence, the cone shape at both the nose and tail. The tail has more surface area than the nose so it's easier to see there. 

I think you're getting hung up on seeking one single visual cue. Take your plane up and do a barrel roll with full aileron and rudder with no elevator. Then do a snap which is the same inputs plus full elevator. In all likelihood depending on your control surface throws, what you see won't be a picture perfect barrel or snap roll, but the difference between the two should be easy to see. 

Verne Koester

Sent from my iPhone

> On Mar 25, 2017, at 12:44 PM, Larry Diamond via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> 
> I can live with that… The implication is that the tail and nose are on different plains in relation to the flight path during the rotation. The size of the conical shape of the tail or nose rotation is not a reason to deduct. However it must be detectable, meaning the judge must see it. Or it is a barrel or axial roll and not a snap.
>  
> What I was really after was to understand better what visual cues should we be looking for to determine if a Snap occurred. I think this can benefit a number of us to properly judge a very difficult maneuver to both perform correctly and judge.
>  
> Also, I forgot to ask, if an element such as a snap or a roll is an element in a maneuver and not completed (i.e. no/zeroed snap, wrong or no roll), the maneuver as a whole is zeroed, correct?
>  
> When we judge, are you watching the tail, the fuse near CG, the nose? Somehow watching the whole plane and then determining what just occurred in about .2 seconds.
>  
> Best Regards,
>  
> Larry Diamond
>  
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Anthony Romano via NSRCA-discussion
> Sent: Saturday, March 25, 2017 10:28 AM
> To: Steve Miller <Snaproll4 at aol.com>; General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Subject: Re: [NSRCA-discussion] Judging the Snap
>  
> I was hoping not to get dragged into this but  I was trying to paraphrase the FAI position. Which as I understand it if isn't an axial roll and it isn't a barrel roll than it it a snap. 
>  
> Anthony 
>  
>  
>  
> Sent from my Galaxy Tab® S2
>  
>  
> -------- Original message --------
> From: Snaproll4--- via NSRCA-discussion <nsrca-discussion at lists.nsrca.org>
> Date: 3/25/17 11:08 AM (GMT-05:00)
> To: nsrca-discussion at lists.nsrca.org
> Subject: Re: [NSRCA-discussion] Judging the Snap
>  
> Considering what snaps have evolved to today, there is only one criterion. "If it's not a roll, it's a snap."  With credit to Anthony Romano.
>  
> Steve Miller
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