A few maneuver examples taken from the reference guide mentioned in this column.
come with some
pilot and designer
flight is essential.
During a loop,
the speed of the
aircraft can easily
it will naturally begin to slow down in
the top of a large, looping maneuver.
If this occurs, it is easy for the pilot to
unintentionally change a given radius
and not perform one that is smooth
and constant. Keeping a constant speed
helps make the maneuver smooth and
the radii equal.
Pilots must remember to adjust the
size of the maneuver according to the
power-to-weight ratio of their aircraft.
If an airplane is overpowered, you can
fly larger maneuvers, but if the aircraft
does not have enough power, make
maneuvers to a size that maintains
Loops), 8. 8 (Double Humpty Bumps),
and 8. 10 (Reversing 11/4 Loops).
I recently came across a helpful
reference guide on the IMAC website.
It includes a range of examples
selected from the affected families
with respect to partial radii. Please visit
the link listed in “Sources” for more
Exploring the Basics
Examples are beneficial, and to
highlight certain elements pertaining to
radii, I have included a few figures from
the 2013 IMAC Basic Sequence.
Maneuver two is a Humpty Bump
during which the pilot pulls 90° to an
upline, pulls 180° over the top of the
maneuver, and performs a 1/2 roll on
the downline. He or she will then pull
90° to an upright level exit.
In regards to each radius size, the
entry and exit must be equal, but the
1/2 loop over the top of the maneuver
can be a different size. You do not have
to match all three radii in this figure.
Instead, focus on keeping the entry and
exit radius the same.
128 Model Aviation
AUGUST 2013 www.ModelAviation.com