Hi Rob thanks for the response I have tried your solution it seemed to have solved my problem.Just as you said to set the axis only and leave the calibration I have done that the problem is gone.I have tried it 4 times now pretty stable no deceleration after takeoff, so the issue is to do with FSUIPC I guess. I have struggled all day trying to solve this it was giving me a headache almost gave up on Fsx.
I really appreciate thank you very much for your help.I'll keep an eye try more couple flights and see if the problem is gone for good,then I'll leave a positive feedback for you...Cheers
Lloyd