BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px; } Gerry You dont mention in your fault finding, the coarse mechanical trim wheel in the yoke housing. Can you confirm this is centred? Kev On Sat 18/07/09 8:58 AM , Gerry Winskill gwinsk@xxxxxxx sent: Another day and another problem! This time it's my CH USB Yoke. For about a week now I've found that leaving the yoke hands free results in the aircraft slowly banking and turning to the right. It happens with a variety of aircraft, so it's not aircraft.cfg induced. I've allocated a couple of keys to aileron trim but they have no effect. I've recalibrated several times. No effect. I've recalibrated, pressing a button to indicate the yoke is centred, whilst actually holding it in the approx position needed for level flight, in the current situation. I'm beginning to suspect the inabillity to trim, or calibrate, out points to the Yoke internals as the culprit. I seem to recall someone on the list trying to open up the yoke, with explosive results! So, the only idea I have is to try squirting electrical cleaner into it. Anyone any ideas please? I've had the yoke since the USB Yoke first came out, so perhaps it's just knackered! Gerry Winskill