ISO 12215-7:2020 小型船—船体構造と寸法—パート7：ISO12215-5を使用した多胴船とその局所寸法の荷重の決定 | ページ 6

3.1

multihull

craft with two or more hulls with a connecting wet deck (3.8) /crossbeams above the loaded waterline, as opposed to a tunnel boat or scow

Note 1 to entry: See Clause 6 and Figure 2 for the main dimensions of a multihull.

3.2

design categories

description of the sea and wind conditions for which a craft is assessed to be suitable

Note 1 to entry: The design categories are defined in ISO 12217 (all parts).

Note 2 to entry: The definitions of the design categories are in line with the European Recreational Craft Directive 2013/53/EU.

[SOURCE: ISO 12215-5:2019, 3.1.]

3.3

loaded displacement

m_LDC

mass of water displaced by the craft, including all appendages, when in fully loaded ready for use condition

Note 1 to entry: The fully loaded ready for use condition is further defined in ISO 8666.

[SOURCE: ISO 12215-5:2019, 3.2.]

3.4

mass in minimum operating conditions

m_oc

mass of the craft in minimum operating condition

Note 1 to entry: The minimum operating condition is further defined in ISO 8666.

3.5

sailing craft

craft for which the primary means of propulsion is wind power

Note 1 to entry: It is further defined in ISO 8666.

Note 2 to entry: In this document, non-sailing craft are considered as motor craft.

[SOURCE: ISO 12215-5:2019, 3.3.]

3.6

beam of hull

B_H

beam across the outer hulls

Note 1 to entry: The measurement of the beam of hulls is specified in ISO 8666.

3.7

chine beam

B_C

beam at chine of planing hulls

Note 1 to entry: It is further characterized in 6.1.2.

3.8

wet deck

underside area of the structure connecting hulls with an area greater than 5 % L_HB_H

Note 1 to entry: Some multihulls (3.1) have no wet deck but just crossbeams. i.e. connecting beams.

3.9

craft speed

V

for motor craft, maximum speed in calm water and m_LDC condition that is declared by the manufacturer, expressed in knots

[SOURCE: ISO 12215-5:2019, 3.6.]

3.10

displacement craft

motor craft whose speed is such that

[SOURCE: ISO 12215-5:2019, 3.7, modified - the definition is reworded.]

3.11

displacement mode

mode of running of a motor craft in the sea such that its mass is mainly supported by buoyancy forces

Note 1 to entry: This is the case where the actual speed in a seaway in m_LDC condition is such that its speed/length ratio makes the craft behave as a displacement craft (3.10) .

[SOURCE: ISO 12215-5:2019, 3.8, modified - in the definition,"craft" is replaced with"motor craft".]

3.12

planing craft

motor craft whose speed is such that

Note 1 to entry: This speed/length ratio limit has been arbitrarily set up in this document, but it can vary from one craft to another according to hull shape and other parameters.

[SOURCE: ISO 12215-5:2019, 3.9, modified - the definition is reworded.]

3.13

planing mode

mode of running of a motor craft in the sea such that a significantly part of its mass is supported by forces coming from dynamic lift due to speed in the water

Note 1 to entry: A planing craft (3.12) in calm water runs in planing mode, but it can be obliged to significantly reduce its speed when the sea gets worse, running in that case in displacement mode (3.11) .

[SOURCE: ISO 12215-5:2019, 3.10, modified - the definition slightly reworded and"craft" replaced with"motor craft".]

3.14

non-walking area

area of the craft comprising those areas defined in the owner's manual as being both outside of the working deck and where people are not liable to stand or walk in normal or emergency operation, and those of the working deck of a multihull (3.1) with an inclination of more than 25° against the horizontal in the longitudinal and transverse directions

Note 1 to entry: All other areas of the working deck, cockpit bottom and superstructures are deemed to be walking areas.