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.
|
 |
When the aeroplane
reaches the top of the vertical line it will stop for an
instant, then begin to slide back downwards. The slide should descend straight back at least half the length of the
fuselage without any pitch change before the swing-through
starts, or a Perception Zero must be given. In the slide there must be no
rotation in the rolling or yawing planes, the wings must remain
parallel to the horizon and at right angles to the original
entry direction. |
 |
|
|
The nose must 'fall
through' in the correct direction: either wheels DOWN / canopy
UP (the falling element in the Aresti diagram will have a full line) or wheels UP / canopy DOWN (drawn
with a dotted line in red as shown in the sketch here). |
|
|
Pendulum effect,
that is when the nose swings one or more times through the
vertical after the initial
slide and fall through, doesn't matter. Judgement of the vertical down
line begins as soon as this pendulum effect has stopped. |
|
|
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' and radius 'D' must be constant
Length 'B' = length 'C'
Height difference 'E' is not
important |
Downgrades:
The entry and exit radii must be constant 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 throughout the pendulum period the yaw/roll
attitude must be straight or it must be penalised in the same
way. If you consider that a tail
slide does not meet the half-fuselage length rearwards slide
criterion then you should give a Perception Zero and not 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.. |
