Protech ZOOM 425 ccpm Specifications download pdf (Page 126)

If you have a JR (positive shift) radio, the settings are swapped, e.g. below 50% is heading

hold sensitivity and above 50% is non-heading hold sensitivity. For the intial settings, set the

down switch position to 75% travel and the up switch position to 25% travel.

After you have set the gyro settings, you should disconnect the motor wires and power up the

helicopter to check the gyro settings. If you power up the gyro in heading hold (AVCS) mode,

then the LED on the gyro will blink rapidly for a few seconds during initialization, then stay on.

When you switch to yaw rate mode, then the LED will turn off.

If you power up the gyro in yaw rate (NOR) mode, then the LED on the gyro will blink rapidly

for a few seconds during initialization, then blink slower. You cannot switch to heading hold

mode if you power up the gyro in yaw rate mode.

13.5.4.3. Non-Futaba heading hold gyro setup

You should follow your manufacturer's directions.

In addition, you should set the subtrim step size to the smallest increment possible so you can

get very fine control of the rudder neutral point so you can match the transmitter's rudder neut-

ral point to the gyro's neutral point.

On the Futaba 9C, go to the TRIM menu and change the rudder step size from 4 to 1.

13.5.4.4. Yaw-rate gyro setup

If using a separate yaw rate gyro (not Piccoboard):

You need to enable the REVO MIXING feature on the transmitter and adjust the REVO MIX

curve to effect revo mix changes.

If using any Piccoboard WITHOUT the heading hold module:

You will need to adjust the REVO MIX dial on the Piccoboard to effect revo mix changes.

The revo mix controls the speed or pitch of the tail rotor relative to the throttle position. This is

required to counteract the torque generated by the main rotor blades so the heli does not yaw

while in flight.

You will need to adjust the revo mix so the heli does not yaw at all throttle positions.

The best way to do this is to buy a "lazy susan" type turntable that will allow the helicopter to

rotate freely while the helicopter is weighed down so it won't take off inadvertently.

(Rubbermaid appears to make one which is probably suitable)

Perform preflight checks, then slowly apply throttle.

The helicopter will start to yaw as you apply throttle.

You will need to adjust the revo mix so the heli has no tendency to yaw as you slowly apply

throttle. It is normal for the tail to swing a little when changing the throttle, as long as the heli

does not continuously rotate while the throttle is not changing.

If the helicopter is rotating and you need to increase the thrust of the tail rotor to counteract the

rotation, then you should increase the revo mix at that throttle position or turn right the revo mix

dial on the Piccoboard.

If the heli is rotating and you need to decrease the push of the tail rotor to counteract the rota-

tion, then you should decrease the revo mix at that throttle position or turn left the revo mix dial

Helicopter and Transmitter Setup

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Protech ZOOM 425 ccpm Specifications Page 126