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Humpty Bumps are simple family-8 figures to which a wide range
of complementary rolls (including spins) may be added to create
a great diversity of results. The variations can go upwards or
downwards from the start point, and be either vertical or skewed
to commence with a 45° or 135° pull or push from horizontal
flight. |
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The turn-around is always a half positive or negative loop to
reverse the aeroplane in pitch through 180° back towards the
start point. |
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The same entry and exit radius and line rules apply as for a
stall turn, the pull or push half-loop must also be of (not
necessarily similar) constant radius, and the heading must be
accurately maintained throughout. |
| In the main example here a 45° skewed Humpty
has a two-point half roll on the up-line and a half positive
flick roll on the down-line. The inset shows a 'plain'
all-positive erect vertical humpty without added rolls. |
In the diagram:
~ Radius 'A' = radius 'E'
~ Radius 'D' is not the
same
~ Length 'B' = length 'C'
~ Height difference 'F'
is not important. |
Downgrades:
The entry and exit radii must be the same but the half-loop can
be different. The standard 1 point/5° error applies for
the two major lines, and during and after the turn-around where
slow speed and high torque in up-going humpties can lead to
significant heading variations and part-stalls. Line lengths before and after up or
down rolls are judged with the usual 1 point downgrade
for a visible variation, 2 for a 2:1 variation etc.. Where a
spin is imposed on the down-line of an 'inverted' Humpty it will
of course be at the top of the line, and any subsequent roll
before the pull or push turn-around executed after a brief pause
- note that this second roll should NOT be centred in the
remaining line, that is an error. |
