Tolerances for the manufacture of propellers
In the area of the propulsion many applications exist, that they go from crafts of fishing, of pleasure, of load and of speed between many other's.
It's for that reason that a classification of propeller's exists that determine the tolerances that it should have a propeller, according to the necessities of a craft.
The ISO 484/ 2-1981 Norm establishes the tolerances for the production of propeller's in all their geometric dimension. And divide them in the following classes
This norm contemplates all the dimensions of the propeller's like they are: Pitch, Diameter, Chord Length, Rake, Thickness and separation between blades
The norm requests that they are revised the dimensions of certain radios, this according to the type of propeller that is manufactured.
The tolerances in pitch vary between the several classes how it show the following chart.
The tolerances for the angular deviation between two serial blades are given according to the following chart.
TOLERANCES ON TICKNESS
TOLERANCES ON RAKE
NOTE: Rake is expressed like a percentage of the diameter of the propeller.
TOLERANCES ON THE LENGTH OF THE BLADE SECTIONS
TOLERANCES IN DIAMETER
All the previous tolerances define the geometry of a propeller in accordance with the ISO 484/ 2-1981 Norm.
The same as this norm for the geometry of the propeller exists, the norm is also used SAE-J755 like reference in order to scheme the hub of a propeller.
This contains specified the dimensions of the most common standard bores, the same as the dimensions of the keyway.
These tolerances are those that they are considered in the production of any RICE propeller.
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