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What You Need to Know About Coaxial RC Helicopters

July 5th, 2011 · No Comments ·

Coaxial RC helis are perfect for everyone. These helis are especially good for beginners. They are small and easy to control; there are various coaxial heli models available.

These helis are extremely popular because they are very stable and easy to maneuver. The bodies of coaxial RC helis are generally made of plastic or sturdy foam and the blades are made of plastic or soft nylon.

The coaxial RC helis achieve their stability from the two rotors. They are stacked vertically on each other. These two main rotors spin in completely opposite direction. The reactive torque which is produced by one rotor is nullified by the counter reactive torque produced by the other.

The two rotors produce an additional gyroscopic effect which is responsible for further increase in stability and control of the coaxial RC heli.

The coaxial RC helis also have separate motors for driving each rotor. Each rotor is responsible for driving the main gear. The two shafts for the main rotor are turned by  two gears. The lower rotor is powered by the outside shaft which is hollow. The upper rotor is powered by the inner shaft. The inner shaft rotates or spins inside the hollow shaft. The lift of the coaxial RC helis is controlled by the two electric motors.

They are also responsible for yaw movement or turning movement of the coaxial RC helis. When one of the rotors is slowed down and the speed of the other is increased, the reactive torque produced by the one spinning faster will lead to the yaw movement which is caused by the tail rotor in case of helis with single rotor.

A special electronic board for mixing controls the yaw movement. The board is responsible for seamless mixing of the two motor speeds which produces the turn rate required.

The best thing about the coaxial RC helis is that they have high degree of agility because of the complete cyclical controlling. Lower rotors of the coaxial RC helis come with swash plates which aids in the cyclical controlling. This allows the coaxial RC helis to hover, move left or right and also fly backward or forward.

The major drawback is that the coaxial RC helis are not capable of acrobatics and hence, they may not be as fun as their collective pitch single rotor counterparts. As a beginner they will provide you with a basic skill set that is needed to learn to fly RC helis.

Here’s a Co-axial RC Helicopter in action:

YouTube Preview Image

It won’t be long until you are moving your way up to the bigger and better helis. If you take care of your coaxial copter there are many retailers that will take a trade in if you are looking at moving up. Ensure that you perform proper maintenance and try not to have too many rough landings or crashes.

Have a question about this article or anything else RC Heli related? Ask it in our brand new RC Helicopter Forum and you'll get expert answers quick.

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Tags: RC Helicopter Articles · RC Helicopter Tips

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