| Coaxial helicopter is one of the more
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| | two rotors' lift complementing each other
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| popular images that come to mind when
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| | results in the extraordinary stability
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| people think about electric RC
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| | and hovering ability. Because hovering is
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| helicopters. And for good reasons too;
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| | one of the main components of a
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| these double-bladed helicopters is
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| | helicopter's flight, "easier to hover" is
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| accredited with bringing hordes of new
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| | almost synonymous to "easier to fly".
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| enthusiast into the world of RC aviation.
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| | Controlling the yaw in this setup becomes
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| Their popularity stems from their
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| | only a matter of slowing or speeding up
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| unequivocal stability in the air - which
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| | one of the two rotors. Another merit that
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| makes them relatively easier to master
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| | comes almost as a bonus is that
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| when compared to their single rotor
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| | theoretically, these helicopters do not
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| counter part. They are also predictable
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| | require a gyro - which means that much
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| enough to be flown within the compounds
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| | less tinkering and setting up is needed.
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| of one's home, securing its spot as one
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| | Although very widely praised, coaxial
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| of the most loved indoor fliers. Being
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| | helicopters are not without faults. The
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| able to fly right out of the box because
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| | first one stems from the fact that in
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| they are sold as RTF (Ready to Fly) kits
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| | order to fly, the speed of the two rotor
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| adds to their appeal.
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| | blades must be equal. In fact, these
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| So where did such stability come from? To
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| | helicopters are so dependent on the
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| answer that, the first step lies in
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| | synchronicity of its blades that even the
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| understanding how helicopters work. A
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| | slightest deviation is detrimental. So
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| single-rotor helicopter generates lift
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| | much so that these helicopters will just
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| when their rotor rotates. As the main
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| | spin wildly on the ground, never to lift
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| rotor turns, another force will also be
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| | off. Their two motors simply have to
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| generated - known as torque, which will
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| | always be in their most pristine state.
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| in turn cause the entire fuselage to turn
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| | Also, the stability of these helicopters
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| in the opposite direction. Since the days
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| | comes at the price of sacrificed
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| when helicopters were in their nascent
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| | maneuverability; they are notoriously
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| stage, their pioneers have learnt to
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| | slow and unresponsive. Nevertheless,
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| counter this effect by including another
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| | perhaps the utmost annoyance comes when
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| smaller perpendicular rotor in the tail.
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| | the two blades bite into each other in
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| This rotor counters the any rotation
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| | mid air when most extreme cyclic controls
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| generated by the torque as well as
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| | are applied.
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| provides pilots a mean to control the
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| | All in all, coaxial helicopters are here
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| direction in which the helicopter's nose
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| | to stay. They have become the favorite
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| is pointing at, more technically known as
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| | beginners' RC helicopter. At the same
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| the yaw. To control the yaw, the pilot
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| | time, many experienced pilot enjoy a
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| simply changes the pitch (or the angle)
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| | flight or two of easy indoor flying with
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| of the tail rotor.
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| | these helicopters once in a while.
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| Coaxial helicopters, on the other hand,
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| | Note: Although these coaxial helicopters
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| eliminate the need of a tail rotor
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| | are "relatively" easier to fly than their
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| completely. This is due to the fact that
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| | conventional counterparts, they still
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| these fliers have two rotors, one on top
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| | require hours of practice. Also, their
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| of the other, rotating in opposite
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| | fast rotating blade can cause just as
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| directions. In effect, the torque
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| | much injury as bigger model helicopters.
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| generated by each rotor cancels out one
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| | Therefore, never treat them like toys.
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| another. When such feat is coupled with
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