rotor RC helicopters are generally small electric helicopters which are
very well suited to those pilots just starting out with RC helicopters.
Lacking the traditional tail rotor system used by most helicopters to
counteract the torque reaction of the main rotors, Co-X helicopters uses
an arrangement known as twin coaxial main rotors. This setup employs two
main rotor assemblies stacked atop one another, sharing a common
rotational axis (hence "coaxial"). The rotors spin in opposite directions
(one clockwise, the other counter-clockwise) and thereby cancel out the
normally generated torque, and thus eliminating the need for a tail rotor.
The "co-ax", as it's generally known, employs dual electric motors (one
for each rotor) and a fairly sophisticated electronic control system. It's
within the electronics that the helicopter's rotation is stabilized, and
the main motors are synchronized in order to maintain the excellent
stability these helicopters are known for. Some popular RC coaxial
helicopters are the
and the Co-Co Lama from
of these helicopters are very small and lightweight which means that
they're better suited for indoor-only flight. For more info on this
type of helicopters, you
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