Which types of gyro are installed? Do they feature drift and temperature compensation?
The model versions are fitted with three piezo gyros. (SMS gyros are installed in the Profi version, but three gyros of this type would increase the cost of the cheaper model versions by too much.) Thermal drift is a basic characteristic of piezo gyros, but the integral compensation circuits of the HeliCommand largely eliminate this; each unit is factory-calibrated, and features an integral temperature sensor. Slight residual drift may occasionally occur with the tail rotor; as is the case with every piezo gyro, this manifests itself by the helicopter slowly drifting around its vertical axis when the temperature fluctuates widely, or after the unit has been switched on for a long period; however, this can easily be correctly manually using the trims. It is also usual to switch off and then on again before the next flight, as this action refreshes the neutral point; this is standard practice with piezo gyros. Incidentally, the neutral point trim is fixed at 1.52 ms, i.e. it is not affec
