On a 688 (all flights), if you are at or above about 26kts, then we mostly use one (1) degree rudder to change course under normal operations. It takes about 60 secs to turn 180. The faster you go (at 1') the faster you turn. At a full or flank bell, use as much rudder as needed. At a full bell (26kts), and you throw the rudder over to 10' you would really wip the boat around... 180' turn in less than 30 sec.
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