After snap roll and rolling elements are combined, as shown here, there
should be a brief hesitation between the 1/2 roll and 1-1/2 negative
snap. These components must be centered on the 45° climb.
Performing a double-negative snap roll on a 45° climb requires airspeed
management. Follow the techniques in this month’s column to ensure
cause little deviation with excessive
airspeed. Change the deflection amount
If you are an avid reader of my “RC
Scale Aerobatics” columns, you are
aware that I prefer the use of flight
modes. This means that rates for
multiple control surfaces can be found
on one switch.
I use one rate for both snap rolls
and spins. Before the spin or snap roll,
the correct flight mode is activated—
allowing for the proper break and
rotation of the snap roll or stall and
a break for the spin entry. After
completing the snap or spin element, the
low-rate setting is activated.
Using the correct exponential
percentage softens how the aircraft
reacts around neutral stick, and as a
pilot moves the control stick, maximum
travel can be obtained from the control
For those who are unfamiliar with
exponential, changes will vary on the
percentage of exponential used, but a
great starting point is approximately
30%. This amount, on all control surfaces
for the snap/spin rate setting, allows a
pilot to feel his or her aircraft and any
input change. A pilot can then adjust as
required to meet his or her individual
It is important for RC Scale
Aerobatics competitors to become
familiar with not only the routine, but
also the individual aerobatic elements.
This will allow them to excel when
performing an Unknown sequence.
Equally important are proper aircraft
tuning and practice!
Above all else, learn from others and
always seek the advice of a fellow skilled
pilot to fully enjoy this sport!
Until next time, fly hard!
International Miniature Aerobatic Club (IMAC)
118 Model Aviation DECEMBER2016 www.ModelAviation.com