Overview
ISO 3715-1:2002 - Ships and marine technology - Propulsion plants for ships - Part 1: Vocabulary for geometry of propellers provides a standardized vocabulary and definitions for the hydrodynamically effective parts of screw propellers used in propulsion plants of ships and other vessels. The standard clarifies terms used for propeller geometry (blade shape, sections, pitch, rake, skew, disc area, etc.) and defines the coordinate systems (rectangular and cylindrical) used to describe propeller elements. Mechanical hub construction and components such as propeller caps are excluded from the definitions.
Key Topics
- Scope: Terms and definitions valid only for the hydrodynamically effective part of propellers (not hub mechanical construction).
- Coordinate systems: Rectangular coordinates for propeller position and geometry; cylindrical coordinates (r, Θ, x) for blade geometry and section definitions.
- Basic dimensions and counts: Propeller radius (R), diameter (D = 2R), number of blades (Z), disc area.
- Area parameters: Projected, developed and expanded blade areas; developed and expanded area ratios used for geometric characterization.
- Blade section geometry: Cylindrical blade sections, mean line, camber, chord length, local and maximum thickness.
- Pitch definitions: Local pitch, mean pitch of blade and propeller, pitch angle (relation of pitch to radius), and pitch ratio (P/D).
- Rake and skew: Definitions for blade stagger (rake) and skew, including tip rake and skew angle.
- Auxiliary descriptors: Clearance curve, reference line, centre of gravity positions for propeller and blade.
- Formulas & notes: Standard includes geometrical relations used in specification and measurement (e.g., D = 2R; disc area formula).
Applications
ISO 3715-1:2002 is intended for professionals who need consistent, unambiguous terminology when designing, specifying, manufacturing, testing, or documenting ship propellers:
- Naval architects & propeller designers - to describe blade geometry and communicate design intent.
- Marine engineers & shipyards - for procurement specifications, installation and alignment documentation.
- CFD analysts & model test labs - to ensure geometry definitions match hydrodynamic models and towing-tank data.
- Manufacturers & quality assurance - to define inspection criteria and acceptance tests for manufactured blades.
- Technical writers & standards committees - to produce consistent drawings, reports and cross-references.
Related Standards
- ISO 3715-2 - Vocabulary for controllable-pitch propeller plants (normative reference), complements Part 1 by covering hydraulically operated controllable-pitch systems.
- References in the document also note alignment with community practices (e.g., ITTC coordinate conventions) where applicable.
Keywords: ISO 3715-1:2002, propeller geometry, ships and marine technology, propellers vocabulary, blade sections, pitch, rake, skew, disc area, marine propulsion standards.