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Look particularly for the clean
initial stall.
If the aircraft lifts and rolls or flicks into
the autorotation this indicates clearly
that it must have been
flying at above
stalling speed, and you must then give
the
figure a Perception Zero mark. |
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A smooth and accurate
transition
from the spin directly into the down
line
without any aileron assistance is
also crucially
important. |
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A 'wrong-direction'
(90°, 180° or
270° out) exit on the "A" or "B" axis
of
course hard zeros the figure,
and on the "A" axis this
will be
followed by further zeroes until the mistaken
direction is corrected |
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Note in the figure shown
here
that the Aresti symbol shows a
negative
down-line because
without the spin the basic
manoeuvre
would require a
'push' entry from horizontal. |
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In a properly executed
Spin
you should see: |
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A clearly visible stall
in positive or
negative horizontal flight, on the
correct
heading and without any roll or yaw. |
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The nose should drop
without the CGT rising,
while at the same moment yaw and roll should
begin
and lead
immediately to autorotation. |
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The rotation should stop
and coincidentally the
nose should drop to the vertical
(ZLA) with the
aeroplane on the right heading. There
must be
no perceptible aileron roll to establish the
correct final down-line axis. |
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Note also the
curved trajectory
of the down-line. |
The
aircraft should draw a vertical line (ZLA) and
then execute a
constant radius pull or push through
to horizontal flight on the
right heading. |
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This clearly shows the
decay in forward energy of
the aeroplane, from stall-speed
to a virtual stop before the final pull. |
| Downgrades: |
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Is the CGT maintained up to the point of
dropping into the spin? Height gain or loss is wrong. |
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Entry heading, and roll & yaw prior to
the stall: 1 point/5° |
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The spin entry - does it stall > yaw >
drop into the spin properly, or is it flicked or forced?
(PZ) |
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As the spin stops, is it on heading
without aileron 'assistance' - 1 point/5° if not. |
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Verticality of the down-line: 1
point/5° for axis, roll or yaw accuracy. |
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Rolls on the down-line must follow the
spin after a short pause, ie. they are not
'centred'. |
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Exit line (or it could be a 3/4 loop, 45°
up or another vertical etc.) - CGT or ZLA criterion as
usual. |
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