Andy - The Eagle Tree Guardian instructions require that the gyro is to be mounted level with leveled airframe. Step 1 would be: Level the airplane. Step 2 would be: Install the Guardian at the CG as level as possible in the pitch plane and the roll plane (there is some acceptable slop which the software will correct.) Step 3 would be: With the software active and computer connected to the Guardian, click the "Reset Level Pitch/Roll" button. The airplane is now ready to fly nice and level. The problem here is step 1. How do you determine when the airplane is "level"? Sensei - How do you position the fuselage longitudinally to 0 degrees? Dennis - Your solution is interesting but all I want is the Plane to fly straight and level when I'm not operating the sticks. It keeps me out of a lot of trouble like when I disable the gyro in flight and get more practice flying normally. If I screw up, a flip of a switch saves a lot of walking and tree climbing.