If we divide the
region of operability (green area) to the total area of the polar chart, we
can get a single number that designates the overall operability of the ship,
we call this the operability index. |
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This index is
summarized here for the aft ramp versus the ramp’s height from the calm
waterline, and for different sea states. |
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We can see that the
operability index is acceptable even for high speed states and throughout the
0 to 30 knots speed range. |