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An explanation of the five
figures: |
| The BAeA Beginners 2013 power
sequence Form-B: |
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Forms A, B and C:
Form-A (here
is an example of a Form-A)
is used for entering the judges' marks. Forms B
and C are mirror-images of one another with the
sequence diagram wind in different directions -
the "B" Form has the wind from the right, whilst
the "C" Form has the sequence reversed L-to-R
for wind-left. |
The official Wind:
In this sequence the aeroplane must
start on the "A" axis directly into the official
box wind. The wind direction is clearly shown on
the form. Some sequences start on the "B" axis,
in which case the actual direction taken is
chosen by the pilot to suit the circumstances. |
Wing rocks:
The sequence should be preceded by the statutory
set of three wing rocks - see 'Wing
Rocks'. |
Height minima:
For Beginners the minimum allowable altitude
before 'low penalties' apply is 1,500ft although
the pilot should keep well above this level to
avoid potential questions arising in the judges'
head. Disqualification would result at 1,000ft. |
Recording 'Lows':
If you feel that the pilot has flown below
1,500ft at any point in the sequence (ie.
between the wing-rocks) note at which point this
was, and it will be discussed after the sequence
is finished. Flying too low is taken very
seriously in competition aerobatics, and a pilot
will quickly be asked to stop and his
Proficiency Card reviewed if this occurs. |
The Framing mark:
(see 'Framing')
For Beginners the K-factor for Framing is
10k. At the end of the sequence put your mark in
the framing box. |
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After a short 45° line the pilot
should pull to pitch the aeroplane back into
level CGT flight, travelling parallel to
but in the opposite direction from the entry
line. |
Fig 5 -
The Slow or Aileron Roll (see 'Rolls')
Look for - |
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Level and
accurate CGT flight throughout. |
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An even-rate
360° roll without any sink or 'barrelling' during the
rotation, onto the same CGT axis. |
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Crisp start
and finish points to the roll, wings level. |
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Fig 1 - Erect positive loop (see ' Loops')
Look for - |
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After the
wing-rocks we want a level CGT
start on axis, with no roll or yaw. |
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Mark the entry point with your
pencil. |
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A clear start point, ie. a
positive transition from straight to looping. |
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Watch and memorise the CGT in the 1st quarter - this is your
reference |
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Compare the 2nd, 3rd and 4th
quarters against the 1st for size, position of
end point and radius. |
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There should be no yaw or roll
throughout. |
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The end of the 4th quarter should
be exactly below the top, at the start level. |
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Fig 2 - Stall Turn (see 'Stall
Turns')
Look for - |
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A
crisp 1/4 loop CGT pull to the vertical. |
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Accuracy of the ZLA up-vertical line. |
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The
turn-around without 'bridging', free of yaw
and roll. |
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Accuracy of the ZLA down-vertical line |
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A
crisp 1/4 loop CGT pull back to
horizontal. The entry and exit radii must be
smooth. The
next figure starts immediately. |
Fig 3 - Half Cuban Eight
The Half Cuban combines both looping and straight line
sections. A 5/8ths loop is followed by a 45° down line with a
centred half-roll.
Look for - |
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Judge exactly the same aspects here as for the
loop paragraphs A to D. |
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At
5/8 of the circle, with the aeroplane at 45°
nose-down inverted, the loop must stop at a
clearly recognisable point so you can see the
'end' of the radius. |
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A
short straight line follows with the ZLA
(not CGT) at 45° to the
horizontal. |
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The
half-roll should be brisk, the flight path
judged in CGT on the 45° descending line,
to finish erect with 45° ZLA again. |
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A
moderate degree of yaw or pitching during the
roll can be disregarded (CGT rules), but
'barrelling' or sinking away from the 45°
projected line must be penalised. |
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The
45° line must be continued to match the pre-roll
line in length and ZLA. Line length
before and after rolls are easy to judge, and
must be the same. |
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The
final 3/8 loop to horizontal CGT should
match the loop in radius. |
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The
exit can be lower (or higher) than the entry,
but must be in level CGT on the "A" axis.
The next figure starts immediately level flight
has been reached. |
Fig 4 - A Chandelle
This is not
strictly an 'Aresti' figure, but demands skill
and accurate in-balance flying to achieve
without unbalanced lines.
Look for - |
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A level CGT
start on axis, a then a crisp pull to 45° ZLA
with a brief straight upward line. |
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The aeroplane
should now pitch positive and roll smoothly to
reach the topmost point with the fuselage level
and at 90° to the direction of entry, and with
the wings somewhere between vertical and 45°
inverted. |
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Now we want to
see a mirror of the first half of the figure,
the aeroplane continuing to pitch positive but
rolling in the opposite direction to achieve a
45° descent line that is parallel to the
original 45° up-line. |
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Overall:
This sequence is about as simple as it gets in power aerobatics - even so you can see that the judging explanation runs to quite a
long page (with some of it on other pages too!). The total K here
is 59, whereas at power Unlimited the 'Free' sequence is 420K -
a huge difference. However if you can reason your way through this
sequence you are well on track to having the experience to start
judging at a BAeA competition. |
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