When using the HeliCommand devices of the X-series in models with turbine drive, we recommend the use of this ultrasonic protective cap. The HC-X series is already prepared for use in turbine models by means of internal noise protection measures. However, depending on the individual construction and type of hull, this protection may not be sufficient. In order to cover these eventualities, the use of this ultrasonic protection flap is mandatory in turbine driven models.
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