BS EN ISO 6185-3:2018 ISO 6185‑3:2014
— 1,2 for boats assessed to design category C; — 1,1 for boats assessed to design category D.
As defined by 3.4, the total volume of the buoyancy tubes shall not comprise less than 50 % of the required total buoyant volume of the boat. 7.4.2 Buoyancy determination
Total buoyant volume shall be determined by measuring or calculating the volume of the closed cell foam buoyancy tubes, the volume of the inflatable buoyancy tubes and other inflatable elements at the nominal working pressure, permanent inherent buoyancy (3.7) and permanent sealed buoyancy (3.8) and inherent buoyancy of the rigid parts of the boat.
7.4.3 Level flotation when swamped
When the boat in the fully loaded condition is filled to overflowing with water, it shall float with not more than 10 degrees trim from the unswamped fully loaded waterline and with more than 2/3 (two thirds) of LH above the water.
All compartments shall be filled with water during this test except for: — buoyancy tubes (as defined in 3.5 or 3.6); or — any other inflatable chamber (as defined in 3.3); or — permanent inherent buoyancy (as defined in 3.7); or — permanent sealed buoyancy (as defined in 3.8).
For this purpose the weight of the engine(s) shall correspond to the maximum engine power defined by the builder as given in Tables E.1 and E.2 in ISO 12217-1:2013. This requirement may be demonstrated either by physical test or by calculation.
If using the physical test, vulnerable items such as engines may be replaced with an appropriate mass at the appropriate location as described below.
a) For outboard engines, Tables E.1 and E.2 in ISO 12217-1:2013 columns 2 and 4 give the appropriate replacement mass to be used with respect to engine power for petrol engines. A heavier mass may be used if it is recorded in the owner’s manual. A mass of 86% of the engine dry mass shall be used for diesel, jet-propulsor or electric outboards, if these are supplied as the standard outfit. Boats equipped for use both with and without an outboard engine shall be tested in both conditions.
b) For inboard engines, the replacement mass shall be lead, steel or iron of a mass equal to 75% of the installed mass of the engine and stern-drive.
c) Replacement masses shall, as far as practicable, have the same position of centre of gravity as the actual engine.
7.5 Compartmentation
The buoyancy of the inflatable buoyancy tube shall be contained within a number of separate buoyancy chambers (compartments). The minimum number of compartments is specified in Table 5.
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Distributed through RYA Online Standards Access under Licence No: 2020ET0001 © BSI
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