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I've changed the pilot so he also disappears when the door is open.

Thanks for the reply , Goran. Once the oscillation starts, it amplifies , its as if there is a resonant frequency . The times I have made 180 degree + turns is when I have reduced speed , aborted the take off , and the plane has managed to stay upright on its undercarriage. It doesn't happen on every takeoff. When the aircraft is well aligned on the centreline and only miniscule corrections are made with rudder on the take off run all is well. Applying power slowly or more swiftly appears to make little difference .