Jag72
Key Veteran
Location: 20 minutes south of Boston Mass...
| Here you go..Sensor calibration
Preface
The Sensor of VStabi contains three independant Gyro Sensorelements that are mounted in an 90 deg. angle to each other. Even if they are mounted very precisely, there may be a small diversion from sensor to sensor.
On the ohter hand it is not always possible to mount the Sensors exact level and adjusted along the axis of the helicopter.
Fortunately the VStabi control unit has access to all Sensors simutanelsy, so there is the possibility to correct a slightly misalignment with the Outputs of the other elements. The most effect can be seen on the both cyclic axis, if the Helicopter is performing piruettes. In this case, the tail element produces an high signal, and the both cyclic axis shall produce no signal. If the Sensor is mounted slightly out of level, there will be a signal on one or both cyclic sensors. This gives piruettes that are not absolutely level.
The Adjustment is done after mounting the Sensor, and doing the basic adjustments. Use the default Setup to do the calibration procedure, because the parameters may have an influence.
Calibration Procedure:
- Mount VStabi, and fix everything as intended for flight.
- Unmount the Rotorhead
- Fix the Heli inverted on the Rotorshaft, so that it can be turned freely.
- Connect the PC, Switch on VStabi and Transmitter. Dont move sticks during calibration
- Save Parameterset to Disk
- Click Reset in the Flight parameter panel to set default parameter set
- Display the Sensor calibration Panel, Click Reset.
- Cyclic Calibration
First Deactivate the Tail Calibration. Click "Disable" at the Tail Field. Otherwise the Display will not be correct! Turn the Heli in both directions. Watch the red point. The Red point moves along a Line, which may be longer or shorter, and may have any orientation. Since the direction of the movement ist not deterministic, try to move the Sliders on the sides of the display so that the red point does not move if the heli is turned. This cann not be ensured perfect always , but try to find the optimum. The point shall not cross the green line, independently of the speed of the movement. There is a bit drifting, so the point is not necessary always in the middle. The Display is very sensitive, you can see this, if you accidentially move other axis of the heli as well.
- Tail Calibration
A Line displays the current orientation of the helicopter. Consider the ball end as the nose of the Helicopter. Start with clicking "Start Val". Now yaw the heli at about 90degrees in about 1 second. Watch the red line if it moves at the same speed as you turn the heli. The simplest way is to turn 90 degrees, and watch if the line has turned 90 degrees also. If it has been turned more than 90 degree, klick the "slower" button until it matches. If it has turned less than 90 degrees, use the faster button to make it turn faster. The Center Button is a conveinece function to put the red line to the north orientation.
The precision cannot archived completely exact, because there is a low speed limit. If the rotational speed on the yaw axis is below this speed, it does not get recognized, which is been intended.
Now the Sensor is calibrated in the actual mounting position.
- Load the old Parameter set . Do not select the Swashplate Parameters while loading, otherwise the settings will get lost.
- Select all Banks of the device intended to be used in this Heli and enter the Values from the Correction Fields so they are the same on all banks.
Test the Tail calibration in Flight with the following Mannouver:
Fly from seide to side with medium speed and reasonable height. Without other inputs start piruetting. If the heli starts to fly a curve in the direction you make the piruette, then the direction of your tail calibration may be wrong! It shall go on flying in the initial direction. In this case dont worry, that the Line is moving in the opposite direction. Unfortunately there are a lot of possibilities that change polarity, so it is hard to say which is right on a certain model. If the calibration is done correctly, the heli shall do piuettes without too much drifting even in windy conditions.
Roxxters ROCK!!! |
