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Record of Stability Assessment
Vessel Particulars
| Vessel Name |
Official Number |
| Date |
Location |
| L - Length Overall……..metres |
Weight Required for Assessment |
| B – Breadth….....….......metres |
Max crew |
____ x 75 kg = kg |
| F – distance from waterline at mid-length to top of gunwale (open vessel) or deck (fully decked vessel) ……. metres |
Max passengers |
____ x 75 kg = kg |
| Lowest Downflooding Opening (describe) |
Divers equipment |
____ x 36 kg = kg |
| Maximum cargo |
kg |
| Total weight |
kg |
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.
| |
As
Measured
(metres) |
Evaluation Criteria
(from Appendix 2) |
| Downflooding Height |
_____ |
More than ______ metres |
| Residual Downflooding Height |
_____ |
More than ______ metres |
Offset Heel Angle
Measuring tape method:
Centreline to gunwale:
Gunwale to waterline (vertical)
Gunwale to waterline (offset to port)
Gunwale to waterline (offset to stbd) |
Pendulum method:
Pendulum length:
Plumb bob travel (offset to port)
Plumb bob travel (offset to stbd) |
_____
_____
_____
_____ |
Measurements converted to
degrees1
Port ____°
Stbd ____° |
Less than _____ ° |
1See 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 |
tan
(Angle) |
Angle |
tan
(Angle) |
Angle |
0.000 |
0° |
0.176 |
10° |
0.364 |
20° |
0.017 |
1° |
0.194 |
11° |
0.384 |
21° |
0.035 |
2° |
0.213 |
12° |
0.404 |
22° |
0.052 |
3° |
0.231 |
13° |
0.424 |
23° |
0.070 |
4° |
0.249 |
14° |
0.445 |
24° |
0.087 |
5° |
0.268 |
15° |
0.466 |
25° |
0.105 |
6° |
0.287 |
16° |
0.488 |
26° |
0.123 |
7° |
0.306 |
17° |
0.510 |
27° |
0.141 |
8° |
0.325 |
18° |
0.532 |
28° |
0.158 |
9° |
0.344 |
19° |
0.554 |
29° |
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