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PROP CHARTS

 

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 plane by trying the alternate props. If none work better then stick with the recommended starting prop. Remember not to overload (too big/coarse prop) the engine while running in.

 

Prop chart for 2-stroke motors:

 

Engine Size 2 Stroke  

Starting Prop

 Alternative Props

.049

6x3

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

.09

7x4

7x3, 7x4, 7x5

.15

8x4

8x5, 8x6, 9x4

.20

9x4

8x5, 8x6, 9x5

.25

9x6

9x5, 9x6, 9x7, 9.5x6, 10x5

.35

9x7

9x7, 10x5, 11x4

.40

10x6

9x8, 11x5

.46

11x6

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

.50

12x6

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

.61

12x7

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

.70

13x8

11x8, 12x8, 13x6, 13x7, 13x8, 14x4,

.80

14x6

12x8, 14x4, 14x5

.91

14x7

13x8, 15x6, 16x5

1.08

16x6

15x8, 18x5

1.20

16x8

16x10, 18x5, 18x6

1.50

18x6

18x8, 20x6

1.80

18x8

18x10, 20x6, 20x8, 22x6

2.00

20x8

18x10, 20x6, 20x10, 22x6

 

Prop chart for 4-stroke motors:

 

     Engine Size          4 Stroke  

Starting Prop

 Alternative Props

.20

9x6

9x5, 10x5

.40

10x5

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

.52

12x6

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

.65

12x7

11x7.5, x11x7.75, 11x8, 12x8, 13x5, 13x6, 14x5, 14x6

.80

13x6

12x8, 13x8, 14x4, 14x6

.91

14x6

13x6, 14x8, 15x6, 16x6

1.20

16x6

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

1.60

18x6

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

2.40

18x10

18x12, 20x8, 20x10

2.70

20x8

18x10, 18x12, 20x10

3.00

20x10

18x12, 20x10

 
Technical page and info added by Dave
----------------------------------------
 

Engine Size Conversion

 

Cubic Inch

-- 

Cubic Centimeter (CC)

.10

--

1.63

.12

--

1.97

.15

--

2.46

.18

--

2.95

.20

--

3.28

.25

--

4.10

.26

--

4.26

.28

--

4.59

.30

--

4.91

.32

--

5.24

.36

--

5.90

.38

--

6.23

.40

--

6.55

.42

--

6.88

.45

--

7.37

.46

--

7.54

.48

--

7.86

.52

--

8.52

.53

--

8.68

.58

--

9.50

.60

--

9.83

.61

--

10.00

.65

--

10.65

.68

--

11.14

.70

--

11.47

.72

--

11.80

.80

--

13.81

.91

--

14.90

1.08

--

17.7

1.20

--

19.7

1.40

--

22.9

1.48

--

24.2

1.50

--

24.6

1.60

--

26.2

1.80

--

29.5

2.44

--

40.0

3.00

--

49.1

3.05

--

50.0

3.20

--

52.4

4.58

--

75.0

6.10

--

100

7.62

--

125

Technical page and info added by Dave.

 

 

Braunstone Park Flyers, Dave & Ashley 2006