A good spotter
can observe a
After the 45° downline is drawn, a
brief line segment should be visible.
The person flying the aircraft will then
perform a half roll followed by 11/2 rolls
in the opposite direction. There should
be a brief hesitation between the rolling
elements. Also, the rolling segment
should be centered on the downline.
When complete, another line segment
equal to the first must be shown.
The aeromodeler will begin to pull
5/8 of an inside loop to exit at a high
altitude. Both of the two 5/8 loops must
contain the same radii and the rolling
combination must be perfectly centered
on the 45° downline.
Control Surface Deflection
This figure contains many individual
maneuvers. The first step is to show
a locked heading with no altitude
deviation. A few moments after the
aircraft passes the pilot, the snap-rolling
segment will be flown. The model
must be stalled while performing the
snap roll, which requires the modeler
to “load” the wing by adding elevator
As the wing’s angle of attack changes,
the aircraft’s operator must apply
aileron and rudder deflection in the
same direction for the snap rotation.
After the desired number of rotations
has been completed, the flier will release
stick inputs because the wings are level.
The modeler then begins the first 5/8
looping segment with no visible line
between the snap roll and the loop.
Flying an airplane that is overly
sensitive makes it difficult to perform
a maneuver with consistency. The
judges will notice any small corrections
made by the pilot and
downgrade his or her
When it comes to
amounts, it is best to
have only enough control
throw to make the aircraft
accomplish a given task.
Although it is always
best to start with the
surface deflection and
exponential settings, the
modeler should adjust the
settings to cater to his or
her own needs as well as
the needs of the sequence.
Because this maneuver
contains different aerobatic
elements, use either a flight
mode, dual rates, or the mixes I have
discussed in the past to allow flying on
only one rate, but accomplish what is
similar to an “automatic dual rate.” This
will simplify a pilot’s workload.
During the 11/2 positive snap roll, a
pilot should use only enough control
deflection to execute the perfect snap
roll. If the aircraft is difficult to keep
up with, decrease aileron for overly
sensitive ailerons, rudder if the aircraft
becomes too deep in yaw, etc. The flight
mode or dual rate switch should be
flipped (if applicable) before proceeding
with the rest of the figure.
Some pilots forget to change rates
after a snap roll and only find out when
they are in another segment of the
figure. Battling an overly sensitive model
can be difficult when the competition
nerves kick in!
Wind Correction Basics
Flying when wind is present can be
challenging for pilots of all experience
levels. The figure’s pace will change,
depending on wind speed. Imagine that
this figure is being performed from
left to right with a 15 mph crosswind
blowing away from the pilot. The
model’s flight path will be judged, so
the aircraft must be yawed in a manner
that allows it to remain parallel to the
runway (in the flight path).
Depending on the aircraft’s attitude,
this will require rudder use in both
directions so the model’s nose is always
pointed slightly toward the modeler.
For any drifting caused by wind, a judge
will penalize the pilot approximately
0.5 points per 5° of deviation. During a
5/8 partial loop, the flight path must be
round and remain parallel to the runway.
124 Model Aviation APRIL 2015 www.ModelAviation.com