| Oct 09: Surviving A Flat Spin |
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| Close Calls by Anthony Nalli | |
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Up until the afternoon of the August 13th 2007 our pilot in Great Britain had thought that the flat spin was the province of much more thoroughbred aircraft than his Tipsy Nipper. He also believed it was a maneuver that required positive actions to enter. On both counts he was quite wrong.
Up until the afternoon of the August 13th 2007
our pilot in Great Britain had thought that the flat spin was the province of
much more thoroughbred aircraft than his Tipsy Nipper. He also believed it was
a maneuver that required positive actions to enter. On both counts he was quite
wrong.
Our aerobatic pilot would enter the spin from a wings level,
fully stalled condition. Throttle closed at the stall he sharply applied full
right rudder, full left aileron, and full back stick. Within half a turn he noted the higher nose attitude and
rate of rotation. Within a full turn he knew the spin had gone flat.
Application of full opposite rudder, centered ailerons and
progressive full forward stick did nothing. After a couple of turns our pilot
centered the controls, checked the throttle was fully closed, and reapplied
spin recovery. This too had no effect. During these inputs there was little or
no control load.
He recalled reading that the flat spin was entered by application
of power with opposite aileron and progressive back stick, so he really did not
want to use power. However, locked into a maneuver he didn’t know how to
recover from he was game to try anything.
Tentative applications of power against anti-spin rudder
seemed to have no effect. When he tried giving longer bursts of power the
engine stopped! With no starter motor installed in the aircraft, our pilot
considered losing his engine to be “the least of my problems” as he continued
hurling toward the ground at 3000 feet per minute, completely out of control
still in a flat spin.
It was then that our pilot grimly uttered to himself “Well,
this is it Neil.” But human nature being what it is he was not prepared to give
up.
The rate of rotation was quite high, and the only controls
with any aerodynamic load that he could perceive were the ailerons. Our pilot
desperately formulated that if he applied full right rudder, full right
aileron, and forward stick he might just be able to tip the aircraft into a
steeper spin from which he could hopefully recover.
Finally, the control inputs started to take effect and as he
had predicted (and hoped) he recovered into level flight.
“After 26 turns you would not believe the level of
disorientation” shares our pilot. “Unable to read the instruments, struggling
to maintain straight and level flight, heading away from friendly soil I
recovered enough to consider a forced landing and the wind direction. With no
altitude to air-start the engine the landing area was quickly diminishing.
Turning into wind I could see an area that looked survivable, but as I pitched
up for the soft field landing the main gear caught the top wires of a barbed
wire fence that I was unable to see.”
The wires flipped the plane onto its nose and it settled inverted
in a small marshy hollow. There was no fire and although the port wing tip was
underwater there was no risk of drowning. Since the canopy opened outward and
the grass was against it our pilot would have to try to break the Perspex and
crawl out through the water and mud in order to egress.
“This didn’t seem necessary, as I was in no immediate
danger,” he assessed. “The inverted fuel system was not leaking and the tide
wasn’t coming in. A call on 121.5 went unanswered, so I tried Essex Radar as I
knew commercial traffic above me would be on that frequency. A Ryanair
eventually relayed my mayday and only 20 minutes later the police support air
unit arrived. Two of the crew lifted the tail to enable my escape. A full
turnout of fire brigade and paramedics arrived shortly thereafter, and once it
was established that I was completely unhurt we carried the Nipper to the grass
track that I might have made had the fence not intervened!”
Our pilot reflects “What have I learned from the experience?
Never assume the maneuver you are about to perform will end the same way… and a
lot about flat spinning!”
On this day our pilot’s maneuver-entry altitude was 3500
feet, 500 feet higher than usual since he was trying something slightly
different. He concludes “I judged that I recovered at height of 500 to 700
feet… I will leave the math to you! Remember: Altitude or airspeed, preferably
both.” |
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