The first two comments from the
stall turn section apply equally here regarding the pull or push
to the vertical line, accurate maintenance of the line, and the
eventual pull or push at the foot of the figure.
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When the aeroplane
reaches the top of the vertical line it will stop for an
instant, then begin to slide back downwards. In the slide it
should descend straight back at least half the length of the
fuselage without any pitch change before the swing-through
starts. Throughout this rearwards slide there must also be no
rotation in the rolling or yawing planes, the wings remaining
parallel to the horizon and at right angles to the original
entry direction. |
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The nose must 'fall
through' in the correct direction: either wheels DOWN / canopy
UP (in the diagram the falling element to the pitch-over will
have a full line) or wheels UP / canopy DOWN (which is drawn
with a dotted line in red as shown in the sketch here). |
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Pendulum effect,
that is when the nose swings through in pitch after the initial
slide and fall through, doesn't matter. It must not however be
allowed to persist after the first swing - the vertical down
line does not begin until this has stopped. |
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Check the rearwards
slide for length and straightness - you'll need a raised finger
or pencil to do this accurately. Also look carefully to see that
the aeroplane doesn't roll and yaw as the nose falls through, or
gauge the amount if it does. |
In the diagram on the right:
Radius 'A' = radius 'D'
Length 'B' = length 'C'
Height difference 'E' is not
important |
Downgrades:
The entry and exit radii must be the same just like a Stall
Turn, the usual 1 point/5° applies in pitch, roll and yaw for
the up line - particularly at the 'stop', in the slide, and for
the down-line, and the pendulum must be straight or it is
penalised in the same way. If a judge considers that a tail
slide does not conform to the half-fuselage rearwards flight
criterion, he shall award a soft zero rather than a hard zero. Line lengths before and after up or
down vertical rolls are judged with the usual 1 point downgrade
for a visible variation, 2 for a 2:1 variation etc.. |
