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

[Chris Larson]

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
    From: Ed Alt
    To: 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20041229/5a875d96/attachment.html