Why does the HeliCommand provide looped-through collective pitch, and what is the purpose of learned collective pitch?
The unit needs to learn the values for collective pitch centre and direction at the set-up stage, regardless of the set-up method employed, i.e. using the SET button or a PC – see the operating instructions. 1) If the unit learns the collective pitch direction incorrectly, the servo direction learning process for the H3 swashplate linkage (using the SET button) cannot work. 2) Even though the collective pitch information is not required by the mixer where a single-servo linkage is used, the auto-pilot and automatic trim still make use of the collective pitch information for additional safety measures. For example, the auto-trim channel is blocked at collective pitch minimum, in order to reduce the likelihood of trim corrections on the ground; this may not be essential, but it can prevent trim actions taking place if the unit has learned collective pitch minimum or direction incorrectly. 3) The reference point for Revo-Mix is the learned direction of collective pitch. Incidentally, the
