Radio Control Scale Aerobatics - 2008/02

150 MODEL AVIATION
IN THE LAST column I covered the first five maneuvers of the
2007 Basic International Miniature Aerobatic Club (IMAC)
sequence. This month I will continue to help you, the reader,
become familiar with reading Aresti (the language of aerobatics).
As a recap, please take a moment to review the 2007 Basic
IMAC program. Its sequence consists of the following maneuvers.
1) Roll
2) Humpty Bump with a half roll on the down-line
3) Reverse Sharks Tooth with a half roll on the 45° up-line
4) Reverse Teardrop
5) Hammerhead
6) Loop
7) Half Cuban 8
8) Sharks Tooth with a half roll on the 45° down-line
9) Immelmann
10) 11/2 turn upright spin to upright exit
We left off at the description of maneuver 5, so I’ll pick up
from there.
6) Loop: In Aresti a standard Loop is shown as a circle. This
maneuver is to be flown directly on the
pilot’s center; as soon as the model passes
the pilot, a radius should begin. The Loop
should be 50% complete when it approaches
the pilot’s center (at the top of the
maneuver).
Increase your throttle setting to full when
you are about to begin this maneuver. The
larger the Loop, the more difficult it will be
to keep the model parallel to the runway and
keep a perfect 360° shape.
7) Half Cuban 8: This maneuver, in this
case, is flown at the end of the aerobatic
box. (It is a turnaround maneuver.) The pilot
will perform 5/8 of an inside loop to a 45°
down-line. Once a short-line segment is
How to perform the Basic IMAC sequence
[[email protected]]
Radio Control Scale Aerobatics John Glezellis
An Aresti diagram of the 2007 IMAC Basic-category sequence.
Gerhard Bruckman designed this Yak-55M. Standing are (L-R) Gerhard, Gernot
Bruckman, Mark Leseberg, and John Glezellis.
Also included in this column:
• 2007 European Extreme
Flight Championships
The author flew his 39% Katana S at the 2007 European
Extreme Flight Championships in Znojmo, Czech Republic.
02sig5.QXD 12/20/07 1:20 PM Page 150February 2008 151
shown, execute a half roll. Then show
another short-line segment (equal to the
first). Pull to upright, level flight to
conclude the maneuver.
8) Sharks Tooth: You will need to fly
your model to the opposite side of the
field (also known as the opposite side of
the aerobatic box). When you are ready to
perform this maneuver, apply full throttle
and pull to a vertical up-line. Once you
have established that (and achieved the
desired height of the maneuver), pull
gently to a 45° down-line.
Once the 45° down-line is established
(and a short-line segment is shown),
perform a half roll. Again, show an equal
line segment to the first. Once you have
achieved that, pull lightly to upright, level
flight.
Please remember that your entry and
exit altitudes must be the same for the best
presentation of the maneuver.
9) Immelmann: You will need to fly
your model to the opposite side of the box
to perform this maneuver, which will be
used to gain considerable altitude for the
last component of the Basic sequence.
When you are ready to perform the
Immelmann, apply full throttle and perform
a large half loop. As soon as the model is
inverted, perform a half roll to upright, level
flight. Begin to decrease your throttle
setting in preparation for the spin.
10) 11/2 Turn Positive Spin: Decrease the
throttle setting since the spin will be
performed at the pilot’s center. As you
decrease power, you will need to apply upelevator
to keep altitude. Once the throttle
setting is at idle, feed in up-elevator until
the model stalls. As a result, one wingtip
will drop (which will determine the rotation
of the spin).
Typical spin inputs include right aileron,
right rudder, and up-elevator (if the model
stalled by dropping the right wing) or left
aileron, left rudder, and up-elevator (if the
model stalled by dropping the left wing).
Once 11/2 rotations have been
performed, establish a vertical down-line
and gently pull to upright, level flight.
As promised, I will briefly discuss the 2007
European Extreme Flight Championships,
which Mark Leseberg and I attended. It was
held in Model City Znojmo, which is located
in the Czech Republic.
This event is an invitation-only
Freestyle contest. In a Freestyle
competition, each pilot flies a four-minute
routine choreographed to music to fulfill
certain judging criteria (which I will
discuss in the future).
It was a great experience because the
European flying style is quite different
from that in the US. Also, the hospitality
was fantastic and many new friendships
were made. Most importantly, I urge
everyone to take action at the local flying
site to help in the prosperity of this fine
sport.
For more information, feel free to visit
the official European Extreme Flight
Championships Web site. Enjoy the
pictures, and keep practicing.
Until next time, fly hard! MA
Sources:
European Extreme Flight Championships
www.exfc.eu
International Miniature Aerobatic Club
Box 1010
King NC 27021
www.mini-iac.com
Krill Model
(603) 781-8352
www.skylineaviationonline.com
The author accepts his fourth-place
prize at the European Extreme Flight
Championships.
The Spark F3A from Krill Model is new for the 2008 flying season.
Good friends John Glezellis and Daniel Hrachovec with Daniel’s 39% Katana S.
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