> Not 100% sure if this info applies to modern gyros (had a RC helicopter > 20 years ago) but I don't think the design has changed. Now you have a piezo gyro with no moving parts that outputs a voltage when it is rotated around one of its axes. The gyro uses the Coriolis effect on a vibrating piezo bar to obtain the voltages. There is no limit to the angle you can turn it through but there is a limit on the rate. Also these devices drift with temperature, voltage, and for no particular reason. Less than a small mechanical gyro but 'enough'. Unfortunately the characteristics of the drift can change tottally after a small shock or vibration is applied (small = a few g's drop or engine vibration). Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads