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Electronic Hobby Kits
Electric RC Airplanes
by Andre McFayden
In the recent past, almost all rc airplanes were powered by small
internal combustion engines, using liquid fuels. Models powered by electric
motors were few and far between. The electric rc airplane is now becoming much
more common, especially in models designed for beginning pilots.
Electric power advantages include reliability, convenience, low noise, low
vibration, and lack of fuel residue (clean). The disadvantage of early systems
was low power. However recent electric airplane motors, combined with advanced
batteries, have increased the performance of electric rc airplanes dramatically.
In the more common Brushed motors, current switching is done using sliding
contacts known as brushes. The contacts get hot and wear out over time. In
Brushless motors, the switching happens electronically using a special voltage
regulator (speed controller). This second type of motor and its controller are
more expensive to make. Its advantages are no maintenance and higher
performance.
There are three main types of batteries in use for electric airplane motors.
These are Nickel Cadmium (NiCad), Nickel Metal Hydride (NiMH) and Lithium
Polymer (LiPo). LiPo batteries are lighter for a given application, but tend to
be more expensive than NiCad or NiMH.
Electric rc airplane types include powered sailplanes, scale models, aerobatic
models, and ducted fan (jet-type). Virtually any type of rc model can now be
electric powered. Even powerful electric helicopters are now a reality. In
addition, some new types of rc models have emerged that were not practical
before, e.g. parkflyers and indoor flyers. For the beginner, something slow and
stable is recommended for a trainer aircraft.
Visit the RC Airplane Advisor for more info about Electric RC Airplanes.
This article may be reprinted if proper credit is given and all links left
intact.
Copyright©2005 RC Airplane Advisor
Andre is a regular contributor to the RC Airplane Advisor:
www.rc-airplane-advisor.com
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