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The 3-channel RC helis usually fits on your hand, no more than 6-8 inches long, almost same size as the 2-channel birds. Though some slightly larger ones can go 12 inches or even longer. They are capable of:Up / Down,Turn left / turn right,Forward / backward. The range is limited to about 30 ft.The 3-channel RC helis offers variable forward speed by changing the rotor arrangement. They have two counter-rotating main rotors, one going clockwise and the other counter-clockwise, and controlled by two separate motors. There is a third rotor in the tail (controlled by a 3rd motor), but this one points upward rather than side-ways like the 2-channel birds.The 3.5-channel RC helis are basically the same physically as the 3 channel birds. They usually fit in your hand, as they are no more than 6-8 inches long