Adjusting the pitch is an important requirement to flying any remote controlled model helicopter well. If your mini RC doesn't have enough positive pitch it won't leave the ground, and with too much positive pitch it becomes over powered and difficult to control. The pitch of your helicopter is controlled by the throttle on your transmitter, and changes as the throttle position changes. Your mini RC instructions should come with a pitch setting that's right for your helicopter, but to find and alter the pitch to the needed setting requires that you follow the proper procedure and use a pitch gauge.
Prepare the helicopter for pitch adjustment. Disconnect the motors from both the main and tail rotors to prevent accidental movement of the rotors while making adjustments. Secure the flybar so that it lies level horizontally. The flybar is the small horizontal bar attached to the main rotor assembly, generally located above the rotor blades. To secure it, place a spare flybar vertically against the flybar and the main chassis bar of the helicopter. Secure the spare to both using rubber bands.
Attach the pitch gauge and read the present pitch of your helicopter. Turn on the radio transmitter and connect the battery to your helicopter. Move the throttle stick on the radio transmitter so that it's set to mid-throttle, and then place the pitch gauge on the main rotor blade centred on one of the blades and aligned parallel with the flybar with the top line of the gauge horizontally aligned with the flybar. Take a reading of the pitch of your blade. You'll want this reading to be as suggested by your helicopter manufacturer; if it isn't, you'll need to adjust the pitch until it reads as correct.
Adjust the pitch by turning the control link of the blade. The control link is the metal pole connecting the blade to the rotor assembly. Adding length to the control link will add pitch to the helicopter. Add or remove pitch until the pitch gauge reads the suggested pitch level.
Repeat the process for the other blade on the rotor, adjusting the pitch as necessary.
Disconnect the battery from the helicopter and return the transmitter throttle to the lowest position. Remove the pitch gauge from the helicopter blade and then remove the spare flybar. Reconnect the motors and the helicopter should be ready for efficient flight.
Many manufacturers provide pitch settings for the lowest throttle setting and the highest, you can tune in the pitch even more by adjusting for each setting.
This process will not work for fixed pitch mini-helicopters which do not require pitch adjustments.