In this page you can find all our range of propellers. If you need more information on a specific installation, fill out and submit our datasheet for propellers with your boat’s data.
What you should know about Class “S” propellers
In August 1981 the international ISO have made a clear definition of propeller tolerances for propeller diameter from 0.8m to 2.5m. Thee following rules have been determined.
The pitch tolerances
| Pitch location | Class | ||
| S | 1 | 2 | |
| Local Pitch | +/- 1.5% | +/- 2% | +/- 3% |
| With a minimum of | 10 mm | 15 mm | 20 mm |
Tolerances on edges radius
From 1.5 mm for the class to S 2.5 mm for the class 3
Tolerances on section thickness
Not more than 0.5 mm for class S
Not more than 3 mm for class 3
Tolerances on angle comparing each blade
Not more than 1° for class S and 1
Not more than 2° for class 2 and 3
Advantages of the class s
The comparsion between a class 2 and a class S made in the cavitation tunnel of Val de Reuil has showed an efficiency of 63% for class 2 when the same class S showed an efficiency of 71%. Other advantages such noise reduction or vibrations are the major advantages of the class S.
