ISO/DIS 3715-1

Ships and marine technology -- Propulsion plants for ships

Navires et technologie maritime -- Installations de propulsion des navires

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 3715-1
ISO/TC 8/SC 3 Secretariat: ANSI
Voting begins on: Voting terminates on:
2018-01-19 2018-04-13
Ships and marine technology — Propulsion plants for
ships —
Part 1:
Vocabulary for geometry of propellers
Navires et technologie maritime — Installations de propulsion des navires —
Partie 1: Termes et définitions relatifs à la géométrie de l'hélice
ICS: 01.040.47; 47.020.20
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ISO/DIS 3715-1:2018(E)
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ISO/DIS 3715-1:2018(E)
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ISO/DIS 3715-1:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 System of coordinates ..................................................................................................................................................................................10

4.1 System of cartesian coordinates for definition of propeller position at hull ..................................10

4.2 System of cartesian coordinates for definition of propeller geometry ................................................10

4.3 System of cylindrical coordinates for definition of propeller geometry ............................................11

4.4 System of cartesian coordinates for definition of expanded cylindrical blade

sections (see Figure 4 and Figure A.2) ............................................................................................................................11

Annex A (normative) Hub .............................................................................................................................................................................................12

© ISO 2018 – All rights reserved iii
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ISO/DIS 3715-1:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

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electrotechnical standardization.

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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

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The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee

SC 3, Piping and machinery.

ISO 3715 consists of the following parts, under the general title Ships and marine technology —

Propulsion plants for ships:
— Part 1: Vocabulary for geometry of propellers
— Part 2: Vocabulary for controllable-pitch propeller plants
iv © ISO 2018 – All rights reserved
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DRAFT INTERNATIONAL STANDARD ISO/DIS 3715-1:2018(E)
Ships and marine technology — Propulsion plants for
ships —
Part 1:
Vocabulary for geometry of propellers
1 Scope

This part of ISO 3715 gives terms and definitions for screw propellers used in the propulsion plants of

ships and other vessels (such as mobile offshore drilling units) that are self-propelled or propulsion-

assisted. Exceptional designs, as e.g. rim drives, are not covered.

The definitions are valid only for the hydrodynamically effective part of the propeller based on

cylindrical blade sections. No definitions are given for the mechanical design of the hub.

Vocabulary for hydraulically operated controllable-pitch propeller plants is given in ISO 3715-2.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 484-1, Shipbuilding — Ship screw propellers — Manufacturing tolerances — Part 1: Propellers of

diameter greater than 2,50 m

ISO 3715-2, Ships and marine technology — Propulsion plants for ships — Part 2: Vocabulary for

controllable-pitch propeller plants
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
screw propeller
3.1.1
propeller radius
R [General]
RP [Computer]

largest distance of the extreme point of a blade (i.e. blade tip) rectangular to the x-axis

Note 1 to entry: For propellers with adjustable blades and controllable-pitch propellers, this definition is valid

for design pitch.
Note 2 to entry: For definition of coordinate system see Figure 2.
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ISO/DIS 3715-1:2018(E)
3.1.2
propeller diameter
D [General]
DP [Computer]

diameter of the circle passed by the extreme point of a blade whilst turning around the x-axis

Note 1 to entry: D = 2R

Note 2 to entry: For propellers with mounted blades and controllable-pitch propellers, this definition is valid for

design pitch.
3.1.3
number of blades
Z [General]
Z [Computer]
total number of blades of a propeller
3.1.4
disc area
A [General]
A0 [Computer]
disc area calculated by means of the propeller diameter
AD=
Note 1 to entry: See Figure 2.
3.1.5
area ratio
ratio of any area based on blade geometry and the propeller disc area
Note 1 to entry: See 3.6.1 for further details.
3.1.6
propeller plane
y- and z-plane
Note 1 to entry: See Figure 2.
3.1.7
direction of rotation, right-handed

when going ahead the propeller moves in the upper point from left to right (seen from aft)

3.1.8
direction of rotation, left-handed

when going ahead the propeller moves in the upper point from right to left (seen from aft)

3.1.9
angular coordinate
Θ [General]
is coordinate, positive in direction of propeller rotation
Note 1 to entry: See Figure 3.
2 © ISO 2018 – All rights reserved
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ISO/DIS 3715-1:2018(E)
3.2
hub
boss

part of the propeller the blades are fitted to (integral or removable), and forming the connection to the

propellers shaft and, in the case of controllable pitch propellers, the housing of the mechanism to pitch

the blades
Note 1 to entry: The propeller cap is usually not part of the hub.
3.2.1
hub diameter
d [General]
DH [Computer]
diameter of the hub in the propeller plane
Note 1 to entry: See Figure A.1.
3.2.2
fore diameter of hub
d [General]
DHF [Computer]
fore diameter of the hub, not considering any shoulder
Note 1 to entry: See Figure A.1.
3.2.3
aft diameter of hub
d [General]
DHA [Computer]
aft diameter of the hub, not considering any shoulder
Note 1 to entry: See Figure A.1.
3.2.4
hub length
l [General]
LH [Computer]
length of the hub, any shoulder aft and fore included
Note 1 to entry: See Figure A.1.
3.2.5
aft length of hub
l [General]
LHA [Computer]

length of the hub taken from propeller plane to aft end of the hub including aft shoulder

Note 1 to entry: See Figure A.1.
3.2.6
fore length of hub
l [General]
LHF [Computer]

length of the hub taken from propeller plane to fore end of the hub including fore shoulder

3.2.7
hub diameter ratio
d /D [General]
DHR [Computer]
relation of hub diameter to propeller diameter
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ISO/DIS 3715-1:2018(E)
3.3
blade

part of a propeller beginning at the contour of the hub and ending at the blade tip

3.3.1
blade tip
outermost part of a blade, positioned at the propeller radius R

Note 1 to entry: In special cases, the blade tip is represented by the mid chord point of a cylindrical section at the

propeller radius R.
3.3.2
blade root
zone of transition between blade and hub
3.3.3
leading edge
LE [General and computer]

blade edge directed to the inflow under normal operating conditions starting from the blade root and

ending at the blade tip
3.3.4
trailing edge
TE [General and computer]

blade edge opposite to the inflow under normal operating conditions starting from the blade root and

ending at the blade tip
3.3.5
shape of edges
shape of the fore and aft part of a cylindrical section
Note 1 to entry: E.g. rounded, sharpened edges.

Note 2 to entry: Examples of shapes: anti-singing edge, edge with rounded nose (see e.g. 3.4.7.3).

3.3.6
suction side
back
SS [General and Computer]
blade side, directed to the inflow under normal operating conditions

Note 1 to entry: It is the upper side of a cylindrical profile section (see Figure A.2).

3.3.7
pressure side
face
PS [General and Computer]
blade side opposite to the suction side (see Figure A.2)
3.3.8
blade outline
shape or contour of blade
3.3.9
centre of gravity of blade
mass centre of blade
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ISO/DIS 3715-1:2018(E)
3.4
cylindrical blade section

developed penetration area of a cylinder coaxial related to the x-axis of a propeller with a propeller

blade at design pitch
Note 1 to entry: See Figure A.2.
3.4.1
chord line of blade section
CLS [General]
the chord line coincides with coordinates x
Note 1 to entry: See Figure 5.
3.4.2
mean line of blade section
camber line
MLS [General]

connecting line of the centres of contact circles between suction and pressure side

3.4.3
camber
f [General]
F [Computer]
f is equal to maximum y -value of the m
...