Horizontal wind profile

Dear Kevin,

Ah, I understand now. As discussed many times on this forum, the RotThrust output includes not only the applied aerodynamic loads, but also the contribution from weight/inertia of the rotor along the shaft axis. In your case, you have a 5-deg shaft tilt, so, the weight of the rotor yields a mean value of 94 kN along the shaft axis in the absence of aerodynamic loads. You could mostly eliminate this by setting the shaft tilt to zero (ShftTilt = 0), but the tower deflection from the enabled tower DOFs will also impact the tilt of the shaft a bit.

Best regards,