Snap Switch

[Verne Koester]

Gray,
You have to follow the track of the plane. As the nose is pitched with elevator, stalling the plane, the application of aileron and rudder will initiate the rolling part of the maneuver. At that point, the whole mass is rotating around a point that probably isn't even on the plane but is on the original track the plane was on when it was started. With proper setup and execution (requiring lots of practice) it IS possible to have it end up back on track and heading, but there will be a shift to one side or another. As long as track and heading are maintained, such as a 45 degree downline, the radius of a loop, or a simple straight line depending on the maneuver being performed, there should be no downgrade. The main things to watch for is a defined break in pitch and the cone-shaped rotation near the tailfeathers. Get all of that and you've definitely got a snap. After that, it's all track, heading, and positioning that determines the score. As a judge, it's just about impossible to see the side to side shift on a maneuver done stage center. I'll bet we'd all be surprised if we watched it from on end!

Verne
  ----- Original Message ----- 
  From: Gray E Fowler 
  To: discussion at nsrca.org 
  Sent: Tuesday, April 13, 2004 1:32 PM
  Subject: RE: Snap Switch



  Okay someone please explain this........ 

  A "proper" snap will change the aircraft's "heading/line".     If the aircraft's line is off 15 degrees it is a 1 point downgrade.  These two things do not mesh. It means there is no such thing as a 10 snap, unless the heading change is less than 7.5 degrees for a 1/2 point down grade?
  If it is impossible to score a 10, then maybe the wording needs to change to allow for a heading/line  change.


  Gray Fowler
  Principal Chemical Engineer
  Composites Engineering 


       "Poole, Mark" <mpoole at harris.com> 
        Sent by: discussion-request at nsrca.org 
        04/13/2004 12:19 PM 
        Please respond to discussion 

               
                To:        discussion at nsrca.org 
                cc:         
                Subject:        RE: Snap Switch 



  This is exactly what was taught in the IMAC judging school I attended last year, conducted by Fred Johnson, who was the chief judge at the TOC and also is an IAC judge.   A properly executed snap will displace the aircraft from it's original line. 
    
  Mark   
  Ed Deaver wrote: 
  Not sure if this has been discussed, but Isn't there a thing with snaps called Displacement, meaning as a break occurs to initiate the snap, a slight change in aircraft position, will occur.  If this slight change in lateral movement doesn't take place than it can be argued it wasn't a snap.  Some may say heading changed but I'm thinking that the heading and angle stay the same, just the entire event shifts or displaces the plane laterally. What say the pilots in the know?? ed 

  BUDDYonRC at aol.com wrote: 
  Wayne 
  Yes, the heading change is a downgrade-1 point per 15 degrees off heading, A barrel roll is not a snap and earns a 0. 
  Buddy 


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