
H3000 Pilot Handbook
70
HB-3001-03
Step 4 ~
Boat lag
Boat Lag is the time taken for the boat to respond to changes in helm. Heavy
displacement hulls require a larger value for boat lag.
Checking the Boat Lag
At a speed not exceeding 15 knots, change course by 90o in either direction.
Observe the Pilot steering performance. The boat should turn onto the new heading
with minimal overshoot (a slight overshoot is acceptable).
If the overshoot is consistently more than 5o for course changes in both directions
increase the Boat Lag value in steps of 0.1 until the overshoot is corrected.
It is easier to spot overshoot than undershoot, hence if no overshoot is observed
decrease the boat lag in steps of 0.1 until a small overshoot is seen. Use the smallest
value of Boat Lag possible to minimise overshoot.
Boat Lag Response
Autopilot
controlled turn
Minimal Overshoot
Returned to Course
Autopilot
controlled turn
Returned to Course After
Several Overshoots
Large Overshoot
Boat Lag
Value Correct
Boat Lag
Value Incorrect
(to small)
Содержание h3000
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