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Wednesday, April 2, 2014

Unconventional Recovery

Some (a few, well, maybe one) of you are familiar with the spin recovery acronym PARE. That's Power to idle, Ailerons neutral, full opposite Rudder, Elevator through neutral (and once rotation stops, rudder to neutral and recover to level flight). This procedure was a result of NASA spin research in the 1970's and is often referred to as the NASA Standard recovery that works for most all single engine, light airplanes. Other procedures work, too. For example the Beggs/Mueller goes like this: 1) Power off, 2) Remove your hands from the stick/yoke, 3) Full opposite rudder until rotation stops, 3) Neutralize the rudder, 4) Recover to level flight. Every airplane will respond differently and the procedure for recovery for those airplanes approved for spin is contained in the Flight Manual or Pilot Operating Handbook. While both procedures I note above work effectively in the Decathlon, a more unconventional, and some NOT RECOMMENDED inputs work also. Here's how one example goes: With plenty of altitude (5,000' AGL and above), enter a spin, let's say to the left. Allow the spin to develop past the incipient stage (Stages: entry, incipient, developed, recovery). While in the developed phase, add full anti-spin/out-spin aileron, i.e., full right aileron in our example. After a couple more rotations the less stalled wing's (right wing) drag increases enough (as a result of upward deflected aileron) to reduce the left-yaw component that propagated the spin enough to stop rotation, uncoupling yaw and roll. One then neutralizes rudder and aileron and push the elevator through neutral (to break the stall) to recovery. Once again, not recommended, but an interesting aerodynamic experiment (at altitude, in the Decathlon). Come on out to Gordonsville International and we can get you used to all phases of spin (especially the recovery phase)!

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