Displacement during snap rolls (was Why is it so quiet?)

[Rcmaster199 at aol.com]

Thanks Chris, thats what I saw also. No real help there. 
 
Six months ago when we last had SNAP conversations on these pages, it was  
implied by one pilot who also flies Scale Aerobatic planes, that if  sideways 
displacement does not occur in SA routines on the order of a wing  span or two, 
(some SA models have 10 foot wing spans) it isn't a snap and  is zeroed. I 
wished to see that commentary in print. I hope to see Fred  Johnson in March in 
Ocala and I will try to get an answer.
 
In Pattern, about the only time we will see the plane displace one wing  span 
or more, is when it is led with rudder. I saw a couple like these in the  F3A 
Final last summer and zeroed these maneuvers. But the biggest factor that  
was the total lack of break in attitude  prior to the snap. (I agree with  Dean 
and Dave, that's what I saw also) Judging from the number of zero  scores 
pilots received on snapping maneuvers, Finals Judges in general saw  things 
similarly. It is the pilot's responsibility to make the break obvious and  eliminate 
the guesswork on the judge's part. If the pilot decides to displace  first by 
first applying rudder, so be it. 
 
Personally, when the model enters the snap in accordance to the rules and  
then displaces (pitch or yaw or both), I will downgrade proportionately to the  
degree of displacement I see. One to four points for each type. To me, it  
isn't "1 pt per 15 deg" rule that applies in these cases, but the smoothness and  
gracefulness rule. (Its a judgement call, that's why we call it Judging, 
duh!!) 
 
Many Pattern models set-up properly, are capable of  displacing very small 
amounts, almost nil really, in both  pitch and yaw and still perform real Snap 
Rolls. Yet, I agree with Bob  that a very small amount of displacement is 
unavoidable due to finite amount of  time it takes to move the surfaces, and in 
that time span, the model is in  transition, moving to a stalled condition. 
 
Happy New Year everybody
 
MattK
 
that In a message dated 12/29/2004 12:38:17 AM Eastern Standard Time,  
csl at direcway.com writes:

More descriptions can be found on page 109  of our AMA Competition 
Regulations , sections 8.9.3 Family 9.9 : Positive  Snaps and section 8.9.4 Family 9.10 
: Negative Snaps.  
As far as judging info, they talk about  the usual 1 point per 10 degree 
rule, and zeroing a aileron roll, etc, but to  me it is not that different from 
our description on page 78.....
 
Chris Larson
L & D Sales
209-274-2176 Office /  Fax
209-304-0865 Cellular  
-----Original Message-----
From:  discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On  
Behalf Of Rcmaster199 at aol.com
Sent: Tuesday, December 28, 2004  9:17 PM
To: discussion at nsrca.org
Subject: Re:  Displacement during snap rolls (was Why is it so  quiet?)



I am interested in what this Scale Aerobatics Judging guide has to say.  Is 
there a web site?
 
MattK





 
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