Hi Boris, for my M7 I used microservos which are from a quadcopter for elevate and slew, but because these work at 3.6v instead of the higher voltages used on the RX18 board then they worked much too quickly. To slow them down I soldered a 22ohm resistor in series with the motor and this gave the correct speed. Hope that helps. Alwyn
many thanks for the information about resistors, it is one search way I had to slow the micro servo running speed to control the site and the elevation of the gun.