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ZigZag Maneuvre (Kempf Overshoot) - Coggle Diagram
ZigZag Maneuvre (Kempf Overshoot)
Results
Ability of rudder
to control ship
Speed DEPENDENT
Time decreases with speed
Depends on
Stability characteristics
Rudder effectiveness
Speed
Procedure
Steady ship
Deflect rudder at maximum RATE to selected angle
Once changes in HEADING (value set previously)
Deflect rudder to the opposite angle (checking)
Until changes heading as much as the previous -
FINISHES OVERSHOOT
Deflect rudder to the opposite angle again (checking) -
PERFORMS ZIGZAG
First Overshoot
Most important
Results
Time to reach second execute yaw angle
Ability to
rapidly change course
Measures of Countermaneuvring ability
Overshoot width o path
Normal distance to original path
Decreases with
Increased stability
Increased rudder effectiveness
Increases with speed
Overshoot yaw angle
bow develops more angle than rudder
Decreases with increase of stability
Increases with
Rudder Effect
Speed
Indicative of
Amount of anticipation required
by helmsman
in restricted waters
Non Dimensional Time
Degrees of rudder deflection per ship length of travel
Increases with speed
Low speeds - higher rate
High speeds - low rate
Submarines
Also in vertical plane
Overshoot change of depth
Overshoot Pitch angle
OVERSHOOT
HEADING Angle that OVERSHOOTs RUDDER Angle
