Hi Antaris
The Answer is from (luc)the man who do/es dynamic's
The propwalk, a right handed propeller, is designed at a rather conservative value.
I had checked it with care, and the propwalk ahead can indeed be countered by 1.5° right rudder, a very normal rudder angle for this ship.
I kept the same propwalk values astern, in order to be certain it was not exaggerated, and I checked that it can easily be countered through steering from 1.5 kts astern speed. To get this speed, simply accelerate the ship by short astern bursts, controlling with not more than 15° right rudder. The total heading deviation before reaching the speed at which steering is really possible, ie while remaining, astern can be kept under 20°.
Of course, allowing the ship to get a too high yaw rate astern will start a turn that no rudder can control.
Regards,
Luc