Chris Brownhill’s North American NA- 16 was flown in Profile Scale at the
Allen Goff’s Cessna C-182 was built from a Top Flite Gold Edition kit. It uses 2. 4 GHz controls with
lights, throttle, flaps, steerable nose gear, and rudder.
by Fred Cronenwett
Control Line (CL) Scale pilots have long been converting RC kits to CL Scale. This is where Allen
Goff of Muncie, Indiana, found his next
project. The Top Flite Gold Edition kit
for the Cessna C-182 Skylane has an
81-inch wingspan and the box says it
will weigh between 10 and 12 pounds
when it’s completed. Although this
model is larger than an average CL
Scale model, it is not the biggest or the
heaviest one that has ever been flown.
Allen built the aircraft from the
kit with modifications that included
landing, marking, and strobe lights.
The rudder and Robart nose gear are
controlled with a servo, which is helpful
for taxi operations. The model also
has flaps and is powered with an O.S.
.65AX two-stroke engine.
Taking advantage of the new rules, a
Spektrum DX5e 2. 4 GHz radio system
was used to control the throttle, flaps,
lights, rudder, and steerable nose gear.
The Skylane has plenty of surface detail
and is painted with Brodak dope. The
clear coat is DuPont Nason 497-00
SelectClear 2K urethane.
Allen’s model weighs 91/2 pounds,
which is lighter than the advertised
weight. This is a great example of a large
RC design that was converted to CL
Trying to decide what electric motor
to install in your new model requires
more research than choosing a glow
engine does. I will not pretend to cover
everything here, but I will share one
method for selecting an electric motor
for CL Scale. Because we fly with
throttle control, we can always throttle
back if we have installed a too-powerful
Depending upon the manufacturer,
.60-size glow engine.
Other motors are listed as C4130/16
390 Kv, which makes it difficult to
figure out what size aircraft it can fly.
You might have to dig through the
propeller data chart on a company’s
website or call for technical help to find
the best motor based upon your model.
An engine or
motor will produce
a certain amount
of power. A glow
engine will tell
you how much
horsepower it has
and an electric
motor will tell
you how many
watts of power it
has. How many
watts the electric
motor has will vary
the propeller and
One rule of thumb that can help
you size an electric motor is to allow
for 100 watts per pound. If the model
weighs 9 pounds then you would need
at least 900 watts. If you allow for 125
watts per pound then you will have
The best way to get started with
electric power is to take an ARF or an
existing model, where you know how
much the model weighs, and use the
data published by E-flite to figure out
what motor would be a good choice.
Using the Top Flite 60-size P-51D
Mustang as an example, let’s look at
what is available from E-flite.
The data published by Top Flite
shows the 60-size P-51D has a 64-inch
wingspan and will weigh 83/4 pounds
with a glow engine. Experience tells
us that a . 65 glow engine will easily
power this model with a 13-inch
propeller. Some pilots will install the
. 95 four-stroke that can spin a 15-inch
propeller. This model has a narrow
cowl so it is a great candidate for
121 Model Aviation JUNE 2015 www.ModelAviation.com
CONTROL LINE SCALE