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The following chart allows you to estimate the pitch on
an existing fixed blade propeller (an approximation only!)

Simply match the angle of the blade at 3/4 of the propeller diameter.
(A 20" would be 7 1/2" from the centre or 2 1/2" from the blade tip)
Match the propeller diameter with the angle in degrees and read off the corresponding pitch.

NOTE: When setting an Autostream feathering propeller to a theoretical pitch, it is usual to add 1" of pitch to compensate for the flat blade characteristics.


   
Propeller Diameter (inches)
    12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
10 5.0 5.4 5.8 6.2 6.6 7.1 7.5 7.9 8.3 8.7 9.1 9.6 10.0 10.4 10.8 11.2 11.6 12.0 12.5
11 5.5 6.0 6.4 6.9 7.3 7.8 8.2 8.7 9.2 9.6 10.1 10.5 11.0 11.4 11.9 12.4 12.8 13.3 13.7
12 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0
13 6.5 7.1 7.6 8.2 8.7 9.2 9.8 10.3 10.9 11.4 12.0 12.5 13.1 13.6 14.1 14.7 15.2 15.8 16.3
14 7.0 7.6 8.2 8.8 9.4 10.0 10.6 11.2 11.7 12.3 12.9 13.5 14.4 14.7 15.3 15.9 16.4 17.0 17.6
15 7.6 8.2 8.8 9.5 10.1 10.7 11.4 12.0 12.6 13.3 13.9 14.5 15.2 15.8 16.4 17.0 17.7 18.3 18.9
16 8.1 8.8 9.5 10.1 10.8 11.5 12.2 12.8 13.5 14.2 14.9 15.5 16.2 16.9 17.6 18.2 18.9 19.6 20.3
17 8.6 9.4 10.1 10.8 11.5 12.2 13.0 13.7 14.4 15.1 15.8 16.6 17.3 18.0 18.7 19.4 20.2 20.9 21.6
18 9.2 10.0 10.7 11.5 12.2 13.0 13.8 14.5 15.3 16.1 16.8 17.6 18.4 19.1 19.9 20.7 21.4 22.2 23.0
19 9.7 10.5 11.4 12.2 13.0 13.8 14.6 15.4 16.2 17.0 17.8 18.7 19.5 20.3 21.1 21.9 22.7 23.5 24.3
20 10.3 11.1 12.0 12.9 13.7 14.6 15.4 16.3 17.2 18.0 18.9 19.7 20.6 21.4 22.3 23.2 24.0 24.9 25.7
21 10.9 11.8 12.7 13.6 14.5 15.4 16.3 17.2 18.1 19.0 19.9 20.8 21.7 22.6 23.5 24.4 25.3 26.2 27.1
22 11.4 12.4 13.3 14.3 15.2 16.2 17.1 18.1 19.0 20.0 20.9 21.9 22.8 23.8 24.8 25.7 26.7 27.6 28.6
23 12.0 13.0 14.0 15.0 16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0
24 12.6 13.6 14.7 15.7 16.8 17.8 18.9 19.9 21.0 22.0 23.1 24.1 25.2 26.2 27.3 28.3 29.4 30.4 31.5
25 13.2 14.3 15.4 16.5 17.6 18.7 19.8 20.9 22.0 23.1 24.2 25.3 26.4 27.5 28.6 29.7 30.8 31.9 33.0
26 13.8 14.9 16.1 17.2 18.4 19.5 20.7 21.8 23.0 24.1 25.3 26.4 27.6 28.7 29.9 31.0 32.2 33.3 34.5
27 14.4 15.6 16.8 18.0 19.2 20.4 21.6 22.8 24.0 25.2 16.4 27.6 28.8 30.0 31.2 32.4 33.6 34.8 36.0
28 15.0 16.3 17.5 18.8 20.0 21.3 22.6 23.8 25.1 26.3 27.6 28.8 30.1 31.3 32.6 33.8 35.1 36.3 37.6
29 15.7 17.0 18.3 19.6 20.9 22.2 23.5 24.8 26.1 27.4 28.7 30.0 31.3 32.7 34.0 35.3 36.6 37.9 39.2
30 16.3 17.7 19.0 20.4 21.8 23.1 24.5 25.8 27.2 28.6 29.9 31.3 32.6 34.0 35.4 36.7 38.1 39.5 40.8