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Walkera Best Adjustment for PLT and PZT knobs

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Walkera Best Adjustment for PLT and PZT knobs

Old 10-13-2007, 01:30 PM
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DaxFX
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Default Walkera Best Adjustment for PLT and PZT knobs

Functions of PLT and PZT.

The throttle control stick actually does 2 things when you operate it. One obvious function is the motor speed. The other, less obvious, function is the main rotor collective pitch.

Both knobs are for adjusting how the main rotor’s collective pitch moves when you move the throttle control stick. The collective pitch setting is much more sensitive than the motor setting hence these 2 knobs.

The following discussion is restricted to the Flight Mode (upper right switch) “N” or normal setting.

PLT stands for “Pitch Length Trim”. PZT is “Pitch Z Trim”. PLT controls the extents or range of the pitch. PZT controls where the midpoint of this range will be. Turning PLT clockwise increases this range. Turning PZT clockwise moves this range upwards (more pitch). The “Z” in “PZT” is an esoteric reference to the Z-axis (up down) – this only makes sense to those familiar with 3D mathematics.




How to Properly Adjust the PLT and PZT.

The first step is to find the midpoint setting of the throttle stick. At midpoint, the PLT is not effective and, therefore, we can adjust the PZT without too much trouble.

Make sure the battery is fully charged before starting. Unlock the no.8 DIP switch to enable changes to the knobs.

Step One - Finding the Midpoint Setting of the Throttle:

1) Turn on the TX.
2) Connect the battery pack’s plug.
3) Move the throttle trim to halfway.
4) Move the throttle stick to hafway.
5) Observe the Collective Servo (underneath the main rotor #36) (CCPM, walkera 22e instead of 1 servo, The 3 of them move at same time) while moving the PLT knob full left and right. There is a position on the throttle stick where moving the PLT will have NO effect. This is the exact midpoint setting. Find this setting by moving the throttle in small amounts and then moving the PLT left and right for each setting.
6) Mark this setting with a pencil on the throttle rule.


Step Two – Adjusting the PZT:

Note: you will be powering up the heli as if for a normal flight so please observe normal precautions and safety.

1) Prepare for flying – make sure you have a fully charged battery.
2) Set throttle to lowest setting.
3) Set both the PLT to midway (pointing up). Set the PZT to full left (low).
4) Slowly bring the throttle to the Midpoint Setting as you marked in pencil previously. The helicopter might take off so be careful.
5) Adjust the PZT upwards (turn clockwise) slowly until the helicopter is just about ready to take off. Do not fly it with the PZT knob.
6) Power down the heli.

That concludes adjustment for the PZT. Do not touch this knob during the subsequent steps.

Step Three – Adjusting the PLT:
The object here is to adjust PLT for the ideal lift at maximum throttle.


Note: you will be powering up the heli as if for a normal flight so please observe normal precautions and safety.

Caution: You will be dangerously close to the helicopter rotors in this procedure!

1) Prepare for flying – make sure you have a fully charged battery.
2) Set throttle to lowest setting.
3) Set the PLT to about ¼ setting (point the knob to about 9 o’clock)
4) Hold the heli with one hand under the skids with the rotors well away from your body. The heli will try to fly away so get a firm grip.
5) With your free hand, slowly bring the throttle up to maximum setting. Watch out for the rotors!
6) Adjust the PLT upwards (turn clockwise) until you can feel the maximum lift from the heli. Past this point the rotor will slow down and lift will level off and fall. If the rotor is slowed down too much, the battery will drain very quickly and control will suffer, so try and maintain a good speed from the rotor.
7) Power down the heli.

That concludes the adjustment for the PLT.

Lock the settings using the no. 8 DIP Switch. It would be a good idea to note down the PLT and PZT settings on paper.

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