1.3 Tests required by the Standards
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.1053 – Explanatory Notes to the Standards for Ship Manoeuvrability – (Adopted on 16 December 2002) - Annex - Explanatory Notes to the Standards for Ship Manoeuvrability - Chapter 1 - General Principles - 1.3 Tests required by the Standards

1.3 Tests required by the Standards

Parent topic: Chapter 1 - General Principles

1.3.1 Turning tests

 A turning circle manoeuvre is to be performed to both starboard and port with 35° rudder angle or the maximum design rudder angle permissible at the test speed. The rudder angle is executed following a steady approach with zero yaw rate. The essential information to be obtained from this manoeuvre is tactical diameter, advance, and transfer (see figure 2).

1.3.2 Zig-zag test

  1.3.2.1 A zig-zag test should be initiated to both starboard and port and begins by applying a specified amount of rudder angle to an initially straight approach ("first execute"). The rudder angle is then alternately shifted to either side after a specified deviation from the ship’s original heading is reached ("second execute" and following) (seefigure 3).

  1.3.2.2 Two kinds of zig-zag tests are included in the Standards, the 10°/10° and 20°/20° zig-zag tests. The 10°/10° zig-zag test uses rudder angles of 10° to either side following a heading deviation of 10° from the original course. The 20°/20° zig-zag test uses 20° rudder angles coupled with a 20° change of heading from the original course. The essential information to be obtained from these tests is the overshoot angles, initial turning time to second execute and the time to check yaw.

1.3.3 Stopping tests

 A full astern stopping test is used to determine the track reach of a ship from the time an order for full astern is given until the ship is stopped dead in the water (see figure 4).

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