ISO 484/ 2-1981 Norm.
ISO 484/ 2-1981 Norm.

ClassRatio
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

The tolerances in pitch vary between the classes as shown in the following chart.

PITCHSIIIIII
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..

ClassAngular Tol.
S y I+/-1
II y III+/-2

TOLERANCE ON THICKNESS

ClassSIIIIII
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 RAKE

Class
S
I
II
III
Tolerance
+/-0.5%
+/-1%
+/-1.5%
+/-3%

TOLERANCES ON THE LENGTH OF THE BLADE SECTIONS

Class
S
I
II
III
Tolerance with a minimum of
+/-1.5%
+/-2%
+/-3%
+/-5%


   

 

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