Stopping Distance - Crash Stop
Crash-stop distance (head reach) from full-ahead speed per IMO A.751 - ≤ 15 ship-lengths unless waivered for VLCCs.
Head reach / L
10.91 -
Status
Pass - IMO A.751 compliant
Formula, assumptions, and limits
$$\text{Head reach} \leq 15 L$$
Tankers > 100,000 dwt often need waiver up to 20 L. Measured from full-ahead to dead-in-water. Reduced by controllable-pitch propellers and azimuth thrusters.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $Head reach$ | Distance travelled during stopping | m | sea trial |
| $L$ | LBP | m | ship particulars |
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