RC Prop Charts

Prop Chart For Two - Stroke Engines

Alternate Propellors

Starting Prop

Engine Size

5.25x4, 5.5x4, 6x3.5, 6x4, 7x3

6x3

.049

7x3,7x4.5,7x5

7x4

.09

8x5,8x6,9x4

8x4

.15

8x5,8x6,9x5

9x4

.19 - .25

9x7,9.5x6,10x5

9x6

.20 - .30

9x7,10x5,11x4

10x6

.35 - .36

9x8, 11x5

10x6

.40

10x6,11x5,11x6,12x4

10x7

.45

10x8,11x7,12x4,12x5

11x6

.50

11x7.5, 11x7.75, 11x8,12x6

11x7

.60 - .61

11x8,12x8,13x6,14x4

12x6

.70

12x8,14x4,14x5

13x6

.78 - .80

13x8,15x6,16x5

14x6

.90 - .91

15x8,18x5

16x6

1.08

16x10,18x5,18x6

16x8

1.20

18x8,20x6

18x6

1.50

18x10,20x6,20x8,22x6

18x8

1.80

18x10,20x6,20x10,22x6

20x8

2.00

Prop Chart For Four - Stroke Engines

Alternate Propellers

Starting Prop

Engine Size

9x5,10x5

9x6

.20 - .21

10x6,10x7,11x4,11x5.11x7,11x7.5,12x4,12x5

11x6

.40

10x6,10x7,10x8,11x7,11x7.5,12x4,12x5,12x6

11x6

.45 - .48

11x7.5,11x7.75,11x8,12x8,13x5,13x6,14x5,14x6

12x6

.60 - .65

12x8,13x8,14x4,14x6

13x6

.80

13x6,14x8,15x6,16x6

14x6

.90

14x8,15x6,15x8,16x8,17x6,18x5,18x6

16x6

1.20

15x6,15x8,16x8,18x6,18x8,20x6

18x6

1.60

18x12,20x8,20x10

18x10

2.40

18x10,18x12,20x10

20x8

2.70

18x12,20x10

20x10

3.00


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. If none work better stick with the recommended starting prop.

 

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