Prop Charts

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Prop Charts

Prop Chart For Two-Stroke Engines

Engine Size Starting Prop Alternate Propellers

.049

6 x 3 5.25 x 4, 5.5 x 4, 6 x 3.5, 6 x4 , 7 x 3

.09

7 x 4 7 x 3, 7 x 4.5, 7 x 5
.15 8 x 4 8 x 5, 8 x 6, 9 x 4
.19 - .25 9 x 4 8 x 5, 8 x 6, 9 x 5
.20 - .30 9 x 6 9 x 7, 9.5 x 6, 10 x 5
.35 - .36 10 x 6 9 x 7, 10 x 5, 11 x 4
.40 10 x 6 9 x 8, 11 x 5
.45 10 x 7 10 x 6, 11 x 5, 11 x 6, 12 x 4

.50

11 x 6 10 x 8, 11 x 7, 12 x 4, 12 x 5
.60 - .61 11 x 7 11 x 7.5, 11 x 7.75, 11 x 8, 12 x 6

.70

12 x 6 11 x 8, 12 x 8, 13 x 6, 14 x 4
.78 - .80 13 x 6 12 x 8, 14 x 4, 14 x 5
.90 - .91 14 x 6 13 x 8, 15 x 6, 16 x 5
1.08 16 x 6 15 x 8, 18 x 5
1.20 16 x 8 16 x 10, 18 x 5, 18 x 6

1.50

18 x 6 18 x 8, 20 x 6
1.80 18 x 8 18 x 10, 20 x 6, 20 x 8, 22 x 6

2.00

20 x 8 18 x 10, 20 x 6, 20 x 10, 22 x 6

Prop Chart For Four-Stroke Engines

Engine Size

Starting Prop

Alternate Propellers

.20 - .21

9 x 6

9 x 5, 10 x 5

.40

11 x 6

10 x 6, 10 x 7, 11 x 4, 11 x 5, 11 x 7, 11 x 7.5, 12 x 4, 12 x 5

.45 - .48

11x6

10 x 6, 10 x 7, 10 x 8, 11 x 7, 11 x 7.5, 12 x 4, 12 x 5, 12 x 6

.60 - .65

12 x 6

11 x 7.5, 11 x 7.75, 11 x 8, 12 x 8, 13 x 5, 13 x 6, 14 x 5, 14 x 6

.80

13 x 6

12 x 8, 13 x 8, 14 x 4, 14 x 6

.90

14 x 6

13 x 6, 14 x 8, 15 x 6, 16 x 6

1.20

16 x 6

14 x 8, 15 x 6, 15 x 8, 16 x 8, 17 x 6, 18 x 5, 18 x 6

1.60

18 x 6

15 x 6, 15 x 8, 16 x 8, 18 x 6, 18 x 8, 20 x 6

2.40

18 x 10

18 x 12, 20 x 8, 20 x 10

2.70

20 x 8

18 x 10, 18 x 12, 20 x 10

3.00

20 x 10

18 x 12, 20 x 10

Starting Propeller sizes are mid range pitch props that should fly just about any plane designed for that size engine. Use these first as in most cases they will be close to being the correct size. Then use trial and error to try and fine tune the maximum performance from your ship by trying the alternate props.