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

[Rcmaster199 at aol.com]

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

From:  _Ed Alt_ (mailto:Ed_Alt at hotmail.com)   
To: _discussion at nsrca.org_ (mailto:discussion at nsrca.org)  
Sent: Tuesday, December 28, 2004 11:04  PM
Subject: Re: Displacement during snap  rolls (was Why is it so quiet?)


Good topic Bob.  If the model really did a  snap roll, it had to displace 
somewhat.  If not, and if you could  actually tell that it did not, that could be 
an indicator that a snap  roll did not actually happen. Generally, the model 
has to displace to a new  track, however slight, from the yawing and pitching 
moments  introduced.  The criteria should perhaps be that you are able to able 
to  maintain the new track exactly in parallel to the pre-snap track.  How  
much offset is OK is hard to say, but things generally start looking  
suspicious whan it's much more than a couple of wingspans.  You would  generally start 
to see other obvious problems, such as barrel rolling, if the  displacement 
were really large.  For another perspective, I think the  Scale Aerobatics 
Flying and Judging Guide does a decent job of  describing how to grade a snap.
 
Ed



 
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