Heli-Max HMXE0832 - Manual (Page 17)

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Solution 3: Make sure card is OK by putting the card in reader and
checking on your PC.
PROBLEM: 1Si drifts while hovering.
Solution: Use the following procedure to re-calibrate the neutral setting
on the 1Si.
1. Enter the Adjustment mode as described on page 12.
2. The quadcopter should be hovered about 3 feet above the floor in a
calm area without any wind or drafts. Release both sticks for a second
or two and observe the 1Si’s behavior. If the quadcopter drifts forward
or backward, move the elevator trim in the opposite direction until the
model remains in place. Use the aileron trim below the right stick in the
same manner to correct for any drifting side to side.
3. Press down on the left stick to exit the Adjustment mode when the
quadcopter has been trimmed.
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MAINTENANCE MAINTENANCE
When installing the rotor blades on the 1Si, please use this photo as a guide.
There is also an arrow molded on the frame to show the direction the rotor
blades will spin.