ORIGINAL: BarracudaHockey
They specifically tell you not to use those servos for a 50 size nitro heli, apparently they shear shafts due to vibration.
Common problem when used beyond their specs.
Interesting. The [link=http://www.jrradios.com/ApplicationGuide/SubSegment.aspx?SegmentID=42&SubSegmentID=53&SubSe gmentName=30-50ci]JR Servo Guide[/link] lists the 821 as a recommended servo for a 30 to 50 size heli. Where does JR say not to use them ?
Bob