Snaps

[David Lockhart]

Don,

Great point.  Many of the maneuvers we fly are quite complex (as is judging them), the focus on snap maneuvers seems to be biased towards the snap itself.

Dave
  ----- Original Message ----- 
  From: Don Szczur 
  To: discussion at nsrca.org 
  Sent: Wednesday, April 14, 2004 10:57 PM
  Subject: Re: Snaps


  Push vertical, 2 of 4, rolling in to the wind to wind correct.  Keep a touch of the same rudder in after the 2 of 4 to keep fuselage from weather vaning, but just enough crab, with full power, to prevent wind drift.  Stall, add a little throttle as it comes around for a nice tight stall turn, remembering the throttle curve that is programmed into code 18 for precise throttle resolution around idle to 1/4 throttle needed for complete control. As it comes around add a touch of up elevator and some aileron to keep the wings perfectly parallell to the axis of yaw. Hold a touch of rudder as it comes verically down to wind correct the weather vaning (again on the down line). Ease out of the rudder gently to prevent any tail wag on the way down. By now you know the natural frequency of your fuselage and exacly how much rudder is needed to dampen any oscillation after the stall turn.  Get a mental picture on where the snap should be on the vertical down line.  Once at this perfectly centered point on the vertical down line, punch in down elevator, in .25 seconds later come in with the aileron and opposite rudder.  At exactly 320 degrees rotation begin to release the down elevator, then rudder then aileron, thus insuring that the snap speed remains consistent through the snap yet releasing the controls in this order for a precise finish.  Draw an equal line after the snap and then concentrate hard on the radius to make sure that it is exactly the same as the radius going up.  Continue to concentrate hard on the wings level and level pitch exit.  Complete.  The Snap Roll is just one element of the overall maneuver where everything, including airspeed up, airspeed down come in to presentation and final score.
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