[SPAM] Re: Displacement during snap rolls (was Why is it so quiet?)

[Ed Alt]

http://www.mini-iac.com
  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Wednesday, December 29, 2004 12:17 AM
  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
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