Snaps

[RC Steve Sterling]

The oracle speaks.
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Don Szczur
  Sent: Wednesday, April 14, 2004 7:57 PM
  To: discussion at nsrca.org
  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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