Esky Helicopters
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Model revisions
The various models in the series share the same mechanical (motors and running gear setup) by and large, differing mainly in their central electronic control unit (combining the functions of receiver, mixer, Electronic Speed Control and Gyro, also known as the "4-in-1" unit), and in their external appearance and construction (canopy and tail design, but also body/main frame), as well as their servo linkage arms. The Esky Co-commanche, sometimes advertised as the Esky Lama V5, is effectively a Lama V4 with a later canopy design. The tail rotor on some of the Lama models is for aesthetics only and serves no function during flight.The E-Sky Lama family of model helicopters comprises small, 4-channel, remote controlled electric coaxial helicopters produced by E-Sky. These include the original Lama, the Lama V2, Lama V3 and Lama V4, a series of coaxial remote control helicopter aimed specifically at beginners in the world of r/c helicopters. Like other similar co-axial models, the Lama V3, V4 and Co-commanche are mass manufactured in China and are sold ready-to-fly (RTF) out of the box, requiring the pilot to only charge and install the standard Li-poly battery.
The design
Like other coaxial remote control helicopters, the aircraft's power is generated from a dual DC motor system driving co-axial, counter-rotating blades. The "4 in 1" unit is a dedicated electronic control unit combining the functions of a receiver, mixer, gyroscope and electronic speed control. This control unit regulates both motors' speed to provide altitude control (climbing and descending), as well as the relative individual motor speed to provide automatic heading hold and yaw control. The transmitter and receiver modules use FM modulation for the radio signal carrier and Pulse-position modulation (PPM) for the control signal. The helicopters use a simplified coaxial rotor system, with two pairs of rigid fixed-pitch coaxial counter-rotating rotors, of which only the lower one is fully controllable by a swashplate, while the upper one is only stabilized by an inertial fly bar. The swashplate movements are controlled by a pair of micro servos. These servos combined with the throttle and mixer controls of the "4 in 1" unit enable the pilot to control all 3 axes of movement as well as altitude for the helicopter. This particular simplified coaxial rotor arrangement is shared by many beginner and entry-level electric helicopters. The design has the advantage of being mechanically simpler compared to the collective pitch coaxial arrangement with two swashplates, usually found in real coaxial helicopters. This design however poses some limitations on the aerobatic ability of any helicopter using it, in particular regarding its maximum speed and its ability to negotiate wind and to perform rapid air maneuvers without becoming critically unstable.
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