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ISO 484/ 2-1981 Norm.
| Class | Ratio | S & I
| Close to the hub 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95
| II
| Close to the hub 0.5, 0.7, 0.9
| | III | Close to the hub 0.5, 0.7, 0.9
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The tolerances in pitch vary between the classes as shown in the following chart.
| PITCH | S | I | II | III | Local Pitch
| +/-1.5% | +/-2% | +/-3% | -- | Prom. pitch for ratio
| +/-1% | +/-1.5% | +/-2% | +/-5% | Prom. pitch for blade
| +/-0.75% | +/-1% | +/-1.5% | +/-4% | Prom. pitch for propeller
| +/-0.5% | +/-0.75% | +/-1% | +/-3% |
The tolerances for the angular deviation between two serial blades are shown in the following chart..
| Class | Angular Tol. | | S y I | +/-1° | | II y III | +/-2° |
TOLERANCE ON THICKNESS
| Class | S | I | II | III | | Max Tol. with a minimum of | +2% 2mm | +2.5% 2.5mm | +4% 4mm | +6% 6mm | | Min Tol. with a minimum of | -1% -1mm | -1.5% -1.5mm | -2% -2mm | -4% -4mm |
TOLERANCE ON RAKEClass
| S
| I
| II
| III
| Tolerance
| +/-0.5%
| +/-1%
| +/-1.5%
| +/-3%
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TOLERANCES ON THE LENGTH OF THE BLADE SECTIONSClass
| S
| I
| II
| III
| Tolerance with a minimum of
| +/-1.5%
| +/-2%
| +/-3%
| +/-5%
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