The Castle Creations wiring guide shows the best wiring method, regardless of what company
manufactures the BEC.
Ifeel like a kid heading to the toy store at Christmas. The Weak Signals annual event in Toledo, Ohio, is only
a couple of weeks away!
If you’ve never attended the Toledo
R/C Expo, it’s something you won’t
forget. Nearly every manufacturer
is represented, along with hundreds
of vendors. It’s an opportunity to
speak with some of the engineers and
marketing people behind the scenes,
not to mention shaking the hands of
most members of AMA’s Executive
If you decide to attend, be sure
to bring an indoor model with you.
There is an off-site venue in which to
fly. There is also the indoor Electric
Tournament of Champions (ETOC),
where some of the world’s best pilots
display their aerobatic prowess.
The annual auction, held in the
conference center’s ballroom, is
another great reason to go.
The Toledo Show is one of my
favorite events of the year and I get to
see many of you there, which makes it
that much better. I hope you’ll attend.
External BEC Usage
You’ve heard the term, and you’ve
probably used one whether you
knew it or not. Battery Eliminator
Circuits (BECs) are small devices that
eliminate the need for a receiver and
servo battery pack. They take higher
voltage from the motor batteries and
drop it to a level suitable for receivers
There are two types of BECs:
internal and external. An internal
BEC is built into the electronic speed
control (ESC) and an external BEC is
a separate unit that is wired into the
battery connector circuit.
The benefit of using a BEC is not
worrying about taking off with an
uncharged receiver battery. The BEC
pulls power from the freshly charged
Always check your ESC to see
what the limit of the internal BEC is.
Most have it listed on the label, but
some manufacturers only include the
information in the instruction manual.
If your application is going to exceed
the limits of your internal BEC, you’ll
need to disconnect it and use an
external one capable of meeting your
needs. External BEC units generally
provide far more capacity than internal
Most internal BECs can be
disconnected by simply removing
the red wire from the plug going to
the receiver. Be sure to insulate it so
it doesn’t short against anything. By
removing the connector from the
plug, you can reconnect it for another
Proper Wiring Methods
Castle Creations BECs are the
only equipment I have on hand,
but the same wiring precautions
apply regardless of brand. Be sure to
check your BEC’s maximum input
103 Model Aviation APRIL 2014