> 8 Three largest
E.3 Swamped stability test
E.3.1 A metallic test weight with a dry mass of (6dCL) kg but not less than (15d) kg shall be suspended over the
side of the boat at each of four positions in turn. These positions shall be at LH/3 from the ends of the boat (as
shown in Figure E.1) or at the ends of the cockpit, if this is nearer amidships. No other test weights shall be in the
boat during this test, apart from those required by E.2.
E.3.2 d is a coefficient to account for the buoyancy of the test weight, as given in Table E.4. Where test weights
are not all of the same material, the calculation should be similar to
mL mCL mA 6CL
1,099 1,163 1,612
where
mL is the mass of lead weights, expressed in kilograms;
mCL is the mass of cast-iron weights, expressed in kilograms;
mA is the mass of aluminium weights, expressed in kilograms.
ISO/FDIS 12217-1:2001(E)
30 © ISO 2001 – All rights reserved
E.3.3 As an alternative to suspending a test weight over the side, an equivalent heeling moment (calculated
when the boat is upright) may be applied using weights or persons positioned inside the boat at seat level. Persons
may only be used if they are not immersed when the boat is heeled.
E.3.4 With the test weight in each position in turn, swamp the boat by applying a downwards force at a position
on the gunwale at approximately mid-LH until the deepest point of the gunwale or coaming is between 0,1 m and
0,3 m below the water surface. Hold the boat in this position until the water level has equalized between inside and
outside, or for 5 min, whichever is less, and then release the boat.
NOTE It is often helpful to partially fill the boat with water before swamping in this manner.
E.3.5 For each position of the test weights, after a further 5 min have elapsed, the boat shall not heel more than
45°.
Table E.4 — Material coefficient
Material Lead 65/35 brass Steel Cast iron Aluminium
Value of d 1,099 1,138 1,151 1,163 1,612
Key
1 Deck
2 Open boat
3 Cockpit
Figure E.1 — Positioning test weights
E.4 Swamped buoyancy test
E.4.1 Load metallic test weights on the inner bottom of the boat, evenly about the centre of the area available to
the crew, according to the crew limit (CL) as given in Table E.5. This area shall have a minimum headroom
clearance of 0,6 m above the swamped waterline. Alternatively, provided they are not immersed above the knee,
people may be used instead of test weights, provided they have a total dry mass not less than the required mass of
test weights if d is taken as 1,1.
ISO/FDIS 12217-1:2001(E)
© ISO 2001 – All rights reserved 31
Table E.5 — Mass of load test weights
Property Design category B Design category C Design category D
Dry mass (kg) not less than 4dmMTL/3 d(60 + 15CL) d(50 + 10CL)
E.4.2 Swamp the boat by applying a downwards force at a position on the gunwale at approximately mid-LH until
the deepest point of the gunwale or coaming is between 0,1 m and 0,3 m below the water surface. Hold the boat in
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