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| Surprisingly, in the United States
there are no industry-wide standards for the manufacture or repair
of propellers. This being the case, Digital Prop
Shop has adopted portions of the International Organization for
Standardization (ISO) 484/2 standard to determine target tolerances for the
propellers that we repair and tune. The ISO 484/2 Accuracy Classes and
Pitch/Position Tolerances to which we adhere are summarized in the following
charts. |
ISO 484/2 Accuracy Classes:
| Class |
Manufacturing
Accuracy |
| S |
Very High Accuracy |
| I |
High Accuracy |
| II |
Medium Accuracy |
| III |
Wide Tolerances |
ISO 484/2 Pitch & Position Tolerances:
| Class |
S |
I |
II |
III |
| Local Pitch |
± 1.5 % |
± 2 % |
± 3 % |
|
| Mean Pitch per
Radius |
± 1 % |
± 1.5 % |
± 2 % |
± 5 % |
| Mean Pitch per
Blade |
± 0.75 % |
± 1 % |
± 1.5 % |
± 4 % |
| Mean Pitch of
Propeller |
± 0.5 % |
± 0.75 % |
± 1 % |
± 3 % |
| Angular Deviation |
± 1 % |
± 1 % |
± 2 % |
± 2 % |
| Axial Position |
± 0.5 % |
± 1 % |
± 1.5 % |
± 3 % |
| Our "Shop Standard" is
Class
I Tolerances, as we feel this offers our customers the best
price/performance value. We will provide you with an easy to read color report which rates
your propeller relative to these tolerances both before and after the work is
performed. |
1-800-804-7757
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