Toy Helicopter Guide

Helicopters Coaxial And Single-Blade

Well now are going to understand what difference exists between a coaxial helicopter and a single-blade helicopter with tail rotor.

If you have previously read on wikipedia article on helicopters which I linked, you have probably read or encountered the word “counter-torque”.


Well then surely you have not read the article, but since you do not really want to read, although certain knowledge would do well you will try’ me to explain what and the counter-torque of a helicopter and that work takes place.

You may have seen a real helicopter is not it?

Well, you may have noticed that the helicopter as well as having large blades above the fuselage, he also seems more of the behind the small tail.

What are the small paddles behind the helicopter’s tail?

To act as a fan when the drivers too hot!

Seriously blades that are in the queue is technically called TAIL ROTOR, have a very specific function, imagine you have a top, throwing it to the ground, surely the spinner will remain standing turning speed’ finding its exact center of gravity and balance thanks to the centrifugal force that is generated by the thrust, and it’s exactly what you would do without the help of a helicopter tail rotor blades.

Due to the centrifugal force generated by the thrust of the engine which in turn push the blades of the main rotor, the fuselage would turn on itself like a top.

Instead thanks to the blades of the tail rotor that day inversely with respect to the blades of the main rotor, generating the so-called counter-torque force, eliminating all the centrifugal force at the center of the fuselage of the helicopter, so as to enable it to remain with the fuselage starboard at the time the helicopter must turn either left or right, the tail rotor will turn or less will’ more rounds so as to generate less or more counter-torque.

The mystery of the counter-torque, go to the explanation of the difference of coaxial radio-controlled helicopters and single-blade.

The coaxial toy helicopters are generally in 2CH, 3CH and 4CH according to

As you can see in the figure, the coaxial helicopter needs no tail rotor, since the counter-torque is severed directly by the main rotor blades, in fact a coaxial unlike a single-blade helicopter, the main rotor are 4 blades, which 2 below and two above, a pair of blades rotates clockwise, while the other pair turns counterclockwise, so as to eliminate any effect due to the torque difference.

A coaxial helicopter and definitely a helicopter at the level of stability’ compared with a single-blade helicopter is unmatched. So if you’re starting with just a helicopter, I recommend you start with a coaxial.

Obviously the market there are also helicopters 4CH single blade, but you must have already thumbs trained to make fly one, even if the helicopter appears small, the market there are helicopters 4CH single blade which also undertake already’ experiencers pilots for years, type walkera 4 # 3Q that despite its small size and a micro-helicopter difficult to fly.

Fixed And Variable Step by Step (Collective Pitch)

There are other features that differ the radio-controlled helicopters, the fixed pitch and adjustable pitch.

Let’s start with the variable pitch.

A helicopter to be able to lift in flight needs that the blades are inclined up to a certain angle of incidence of about 5 to 6 ° and a half positive, more grades go up, more’ it increases the lift of the blades, until arriving at a maximum of 10/12 ° positive.

And this is what allows the helicopter to get up in the air, or to remain suspended in the air.

It is obvious that when a helicopter is about to land grades diminish to the point that the blades reach of degrees in the negative.

The fixed pitch instead less labor intensive, in fact a fixed pitch helicopter is able to take the flight from no change of inclination of the blades but rather’ by the revolutions of the main rotor, and thanks to the structure of the blades that are designed to collect the air without any change of pace, plus the rotor speed increases, more’ the helicopter takes off.