Translations:Tuning Guide/19/en
From Spirit System Manual
Make sure the Cyclic Ring - Aileron/Elevator range is as high as possible without binding even in min/max collective pitch. Ideally it should be equal angle with your max. collective pitch. But it is extremely important to not exceed angles allowed by the model manufacturer. With models of size 600 and bigger risk of boomstrike is very high with lower RPM.
