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Problem solved. Re-calibrated everything did a test flight and all went well. Not sure but think the failsafe setting had something to do with it. I'm now a happy camper. Thank all for your quick reply.

I have a stock 450 with gps. Every thing checks out as far as I can see. Correct led flashes , motors start at half throttle if I advance throttle at all the motors speed up almost all the way then after a few seconds they almost stop. This is while I'm holding on to it just enough to keep it...