Above: Joe Eiben’s P- 51
was built from an ARF and
has flaps, throttle, and
Right: The bottom view of
Joe’s P- 51 shows its four-stroke engine, retracted
landing gear, and the on/
off switch for the 2. 4 GHz
Ailerons are effective and must be set to the neutral location
for CL flight. One trick is to mount a standard servo to hold
the location of the aileron and if the wind is gusty, move the
aileron to a new position to counteract the wind. The aileron
servo is not plugged into the receiver.
The only modifications from the RC instructions are three
1) Install a bellcrank, the leadouts, and the line guide to
control the elevator.
2) Lock the rudder and aileron in the neutral position.
3) Add wingtip weight.
Where to Start
If you want to try CL Scale and are not sure about some
of these ideas, build and fly an ARF for general flying. Select
an engine/motor and a 2. 4 GHz control system and give it a
try. This allows you to experiment and if you make a mistake,
it is no big deal. After flying your model for some time, you
will know what you like and don’t like and before you start a
more serious CL Scale project, you will have experience with
a practice model.
Another option is to pick up a used model at an RC swap
meet or auction and install a bellcrank and 2. 4 GHz control
system to give it a try. RC swap meets or auctions are a great
way to find items for CL Scale models.
CL Scale is all about the static score and mechanical or
flight options during the flight portion.
Half of the score is the static score,
while the other half is the flight score.
This means the model needs to look
like the full-scale aircraft and also
fly correctly. It is not uncommon for
models to show up at a contest and do
well with static points, but not score
well with the flight points.
The static portion is all about the
outline, detailing, colors, markings, and
making sure the airplane accurately
replicates the full-scale aircraft.
This can be a fun event that
allows a modeler to create his or
her own fleet of models.
When I go to a hobby shop
or hobby show, I look at the
electronic devices, hardware,
kits, motors, and engines for RC
models to see if I can use them
for CL Scale models. You never
know what you might find that
can be used for your next project.
The AMA Special Interest
Group for Scale is the
National Association of Scale
Aeromodelers (NASA). It is
responsible for organizing and running the annual RC and CL
Scale Nats. NASA’s website has all of the judging forms and
plenty of information related to Scale modeling.
I have a You Tube channel with videos on how to set up CL
Scale models with 2. 4 GHz for glow- and electric-powered
models. There are also videos showing several models flying so
you can see and hear some the items that have been covered
in this article. Search for my name and look for my channel.
I have also included several companies in the “Sources”
listing for some of the equipment mentioned in this article.
Good luck with your next project! Land softly!
MBS Model Supply
Model Sounds Incorporated
Dave’s R/C Electronics
26 Model Aviation JUNE 2015 www.ModelAviation.com