I installed an ElectriFly RimFire 370 motor in my warbird variant of the
Parallax. This little motor provides plenty of power. Resist the urge to
install larger, heavier power systems.
The Thunder Power 3S 850 45C battery is a cozy fit in the fuselage.
Velcro keeps it in place. I left the battery area of the fuselage open for
easy access and good cooling.
The Parallax is built with Depron foam and requires no ribs. Here, the
carbon-fiber spars are being glued into place before adding the top
If you alter the width of the fuselage or the
pod, you will also alter the effective wing area and
centerline. The fuselage location must reflect this
change as well.
Although lateral balance of the Parallax is not any
more critical than on other airplanes, this model’s
unique configuration means it can easily get out of
whack if you aren’t paying attention.
You may want to add details to the cockpit pod. If
you do, keep it light. Because the pod is offset from
the centerline, any weight you add to the pod must
be offset by weight in the opposite wingtip.
You can alter the shape of the tail feathers, as long
as you maintain approximately the same proportions
and area. You also have many choices when it comes
to finishing the model. I prefer to paint mine with
water-based latex house paint. It is inexpensive, goes
on well with a foam brush, and can be thinned with
water for airbrushing.
I’ve flown my Parallax test fleet with a variety of
power systems. I found that I prefer smaller, lighter
setups to more powerful ones. Roughly 125 watts
is perfect for my taste. The ElectriFly RimFire 370
motor and Castle Creations Thunderbird 18 ESC
noted on the plans reflect this choice.
With an 8 x 6 APC propeller and a Thunder
Power 3S 850 45C LiPo, I get a lightweight system
that balances the airplane well and provides plenty
of power. All of my Parallax models have used either
Hitec HS- 55 or E-flite S- 75 servos on every control
Flying the Parallax
You may not believe it until you see it, but the
Parallax flies normally. As long as you’ve kept it
lightweight and stuck to the plans (or the allowed
deviations), you should have a well-mannered sport
airplane with aerobatic capability.
I prefer to start my flights with an underhand toss
by the fuselage, never by the pod. It’s a good idea
to have someone launch it for you until you get it
trimmed out. When in the air, you’ll discover that
the Parallax presents a unique profile in the sky.
Orientation can be challenging if the sun is low
and you’re not accustomed to the airplane’s shape.
Don’t let that scare you. You’ll quickly get used
to it, and that unique shape is the purpose of this
Elevator authority is good for tight loops and
casual inverted flight. The rudder is not necessary,
but it’s fun to have for additional maneuverability.
I can hold knife-edge flight on the left side with
slight pitch coupling toward the canopy. Knife-edge
on the right side has proven to be challenging, with
excessive pitch coupling. If you master it, please
share your secret with me!
The ailerons are effective throughout the entire
50 Model Aviation M AY 2014