Table of Contents
Please disconnect the motor from the ESC when performing setup steps which do not require the main rotors to spin. If the disconnected ESC wires might touch each other when disconnected then you should wrap electrical tape around the connectors to prevent the ESC from being shorted.
This section is very sequence-dependent, and you MUST perform the steps in this order.
The lengthwise CG of a helicopter should be at its main rotor shaft or slightly forward. Otherwise, the heli will have a tendency to drift forwards or backwards.
To check this, first install the heli's batteries. Rotate the main rotor so the blades are perpendicular to the body. Hold the main rotor blade grip closet to you and raise the heli up to eye level. Locate a wall corner or door jamb, and rotate the heli so you can see the vertical line of the wall corner behind the helicopter.
Now try to align the main shaft with the vertical line. If the main shaft aligns perfectly with the line, then no adjustment is necessary. If the nose is light, then you will need to pull the battery pack forward. If the nose is heavy, then pull the battery pack backwards. Repeat until you find the correct battery position to balance the heli correctly.
If you use a tail servo mount on the ECO, the battery pack will need to be shifted forward quite a bit to adjust the CG properly. If you do this, you will need to put a rubber band over the two front side frame pegs to support the battery pack.
If you use 8 cells on a Corona, the heli will be very nose-heavy. You will need to push the battery backwards as far as possible, and possibly add a little tail weight.
Note: Do not add weight to adjust the left/right CG of the helicopter. This can be adjusted using the transmitter left/right cyclic trim later.
If the CG is too far backwards and you have already pulled the battery as far forward as possible, then you may need to modify the frame to allow the battey to be mounted further forward. Avoid adding weight to the nose because a large amount of weight will be required to counteract the leverage of the tail.