Where to use the gyro?
The first thing you need to decide is which axis you want to use the gyro in.

Aileron :
Helps with stability in the wind to keep wind gusts from flipping the wing over. Especially on take off and landing. A gyro on a foamie can make 15mph feel like 5mph. Wind can still make the airplane move up and down with the wind as well as flip over when not moving forwards on the runway.

Helps some with stabiltiy in high winds. Also very helpful to stabilize short coupled aircraft (short tails) or aircraft that is tail heavy. Be careful though, I have heard that using a gyro on the elevator can sometimes change the stall charactoristics of the plane, for better or for worse.

Rudder/nose wheel:
Can help with "squirrely" tail draggers or ducted fan jets on take off. This sometimes requires altering the amount of throw or being able to turn the gyro on and off (with a seperate switch like the GWS PC-03).

Rotation axis
The next thing you need to do is to determine the rotation axis of the gyro. This determines how you place the gyro into the aircraft. You often have to refer to the gyro manual or examples of how the gyro is mounted in a helicopter as a comparrison.   Some gyros are mounted with the label perpindicular to the axis of rotation while others are mounted with the label parallel to the axis of rotation.

Gyros with the label that is perpindicular to the axis of rotation:

Gyros with the lavel that is parallel to the axis of rotation:

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