Record of Stability Assessment

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Vessel Particulars

Assessment Details: Vessel Assessed as: Fully Decked/ Open (select one)

Note: Assessments are considered valid only when operating in waves not exceeding 2 metres if fully decked, 1.2 metres if open.

¹ See next section “Converting to degrees”

Assessment carried out by:___________ Signature: ______________

_______________________________________________________

Multi-deck vessels: Vertical distribution of equivalent passengers:

Main Deck ____ Upper Deck ____ Flybridge ____

Converting to degrees

If you use the measuring tape or pendulum method to determine the offset heel angle, you will need to convert the measurements taken to angle in degrees. This is done with some simple arithmetic and comparing the result to the values on the table below.

Measuring tape method:

• Subtract the distance from the gunwale to the waterline (offset) from the distance gunwale to the waterline (vertical).
• Divide the result by the distance from centreline to gunwale.
• Compare the result to the values for tan (Angle) in the table below to find the approximate angle of heel.

Pendulum method:

• Divide the distance travelled by the plumb bob by the length of the pendulum.
• Compare the result to the values for tan (Angle) in the table below to find the approximate angle of heel.

Example:
Measuring tape method:

Gunwale to waterline (offset) 1.2 metres
Gunwale to waterline (vertical) 1.5 metres

1.5 – 1.2 = 0.3

Centreline to gunwale 2.5 metres

0.3 / 2.5 = .120

The value of tan (Angle) closest to .120 is .123, so the approximate angle of heel is 7°.

tan (angle)	Angle
0.000	0°
0.017	1°
0.035	2°
0.052	3°
0.070	4°
0.087	5°
0.105	6°
0.123	7°
0.141	8°
0.158	9°
0.176	10°
0.194	11°
0.213	12°
0.231	13°
0.249	14°
0.268	15°
0.287	16°
0.306	17°
0.325	18°
0.344	19°
0.364	20°
0.384	21°
0.404	22°
0.424	23°
0.445	24°
0.466	25°
0.488	26°
0.510	27°
0.532	28°
0.554	29°

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