They are fairly inexpensive and can get one of 4 channels as solopro for about 70 €, having all kinds of parts via online (there are very few shops in Spain that have spare parts for micro helis). For about 150 € we can get a 6 channel heli, pitch and 3-axis gyro for aerobatics. If we have never flown an RC helicopter, start by June 1 channel, variable pitch is unreasonable and probably have many difficulties to get it to fly freely.
The larger an RC helicopter, the greater its weight and the force behind its blades. A fall or accident with a large helicopter, would cause various breaks safely. The micro indoor helicopters, do not spoil they tend to be designed to withstand impacts of medium caliber, but certainly will specify parts of glues and rotors.
Another important point to enter the world of RC helicopters with one of micro type, is safety. Helicopters variable pitch or with a larger rotor diameter of 30 cm can not be considered TOYS, and should not be used without being accompanied. They are dangerous even in expert hands.
If interference occurs, a fault or pilot error is very easy to "jump" the helicopter above, and the results can be devastating. Just open this link if you do not offend the blood, it is a real very explicit example.
Sure after seeing this, and you have much clearer worth start with a "controllable" helicopter. Let's see what options we have.
In terms of the walkera 3d helicopter. There are 3 Channel (forward / backward, turn left / right, up / down) and more advanced 4-channel (idem 3 channels + move left / right). They are clearly distinguished by having two helices + stabilizer bar. Some have a small tail rotor, but can not carry motor. Each propeller is driven by an independent motor. The combination of both coaxial rotation causes stabilize easily, like a spinning top. They are extremely easy to fly, very cheap and therefore the best option if you want to fly "and". Personally I find the flight with a coaxial does not resemble anything like the control of a helicopter rotor propeller +. Although they can be used to practice and learn to blow something unpretentious. They are rather a toy. Not suitable for outdoor flight. It is preferable to invest in a 4-channel helicopter and take a few first steps with the PC simulator.
In these helicopters main rotor design enables the blades can vary their inclination. This propeller pitch control, along with engine power, allows them to fly inverted and doing all kinds of tricks. Usually accurate and somewhat nervous when flying in 3D mode (stunt), hence its complication to fly them. Before moving to a collective pitch helicopter is highly recommended to practice a lot with one of 4 channels and the simulator.
The Walkera Genius CPEs without hesitation the most recommended micro helicopter collective pitch, both for its high resistance to shock, and its flight capacity, and price. The first time I tried it, I did not last more than 25 seconds before a big wreck, but it was fruit of my total inexperience. Today it has become my favorite helicopter. Its benefits exceed more than me, but it flies perfectly, and 6-axis gyro is helpful in inexpert hands as mine. The stabilizer complex incorporates a simple design allows the rotor, without stabilizing or "flybarless" bar.
Depending on the type of rotor and the number of channels to rule, each helicopter pilot requires a different level.
Although you've played with some RC car, do not get carried away and think that you will be able to easily control a heli. Note that to fly a helicopter you have to control 2 levers with a total of 4 axes control sync (2 in a car accelerate / brake, left / right).
The walkera 3d helicopter could be purchased at Banggood. Additionally, if you are interested in the rc helis, you could take into consideration upon another good one of WLtoys V666 with axis hd camera.
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