The
International Organization for Standardization (ISO)
is a worldwide federation of national standards bodies.
This
organization has produced a standard (ISO 484/2) that
defines the manufacturing tolerances for marine propellers.
ISO Tolerances on Pitch
|
Class
|
|
S |
I |
II |
III |
| a) |
Local
Pitch |
Pitch
of one portion of one blade |
± 1.5% |
± 2% |
± 3% |
- |
| b) |
Section
Pitch |
Mean
pitch of one radii of one blade |
± 1% |
± 1.5% |
± 2% |
± 5% |
| c) |
Blade
Pitch |
Mean
pitch of one blade |
± 0.75% |
± 1% |
± 1.5% |
± 4% |
| d) |
Propeller
Pitch |
Mean
pitch of all blades |
± 0.5% |
± 0.75% |
± 1% |
± 3% |
|
The
users of Prop Scan have found the ISO 484 standards a
very fair method of propeller inspection.
Due
to the Prop Scan measuring concept and advances in computer
technology we have been able to enhance the ISO 484/2
specifications.
Prop
Scan EPS (Enhanced Propeller Standards)
