@Delta558 Hi Paul, thanks for that. You're right that 60.0 gives you rudder steering of the tailwheel. It had looked so natural that I didn't notice that was happening. 0 doesn't give you castoring in P3D but 180 does as you said. However in the AH He.111 there is also a hydraulic dependency which stops the wheel castoring with differential brakes which is also unrealistic (hyds should not affect castoring). With asymmetric engine power the wheel castors correctly without hydraulics. In the brakes sections of aircraft.cfg hydraulic_system_scalar is set to 1.000. If you set that parameter to zero
hydraulic_system_scalar=0.00000
the hydraulic dependency on differential braking stops. So with the steering angle set to 180 and the brakes hydraulic scalar set to zero the tailwheel castors correctly regardless of the hydraulics being locked or not.