2-Stroke Glow Plug Engine
ENGINE SIZE IDEAL PROP SIZE PROPELLER SIZE RANGE IDEAL RPM RANGE
0.10 7x4 7x4~6 - 8x4 14000 ~ 16000
0.15 8x4 7x5~8 - 8x4~6 14000 ~ 16000
0.20 9x5 9x4~6 - 10x4~5 12000 ~ 15000
0.32-0.36 10x5 9x6~8 - 10x5~6 - 11x4~5 12000 ~ 15000
0.40 11x5 10x6~8 - 11x5~7 - 12x5~6 11000 ~ 12000
0.46 11x6 10x7~9 - 11x6~8 - 12x5~7 10000 ~ 12000
0.53 11x7 10x8~10 - 11x7~9 - 12x6~8 10000 ~ 11000
0.61 13x6 12x8~10 - 13x6~7 - 14x5~6 9500 ~ 11000
0.75 13x7 12x9~11 - 13x7~8 - 14x6~7 9500 ~ 10500
0.91-1.08 14x6 13x10~11 - 14x6~8 - 15x6~8 9000 ~ 10000
1.20-1.35 16x8 15x8~10 - 16x8~10 - 17x8 8500 ~ 9500
1.40-1.80 18x8 17x8~10 - 18x8~10 - 20x6~8 8000 ~ 9000
2.10 20x10 20x10 - 22x8 8000 ~ 8500

 

4-Stroke Glow Plug Engine
ENGINE SIZE IDEAL PROP SIZE PROPELLER SIZE RANGE IDEAL RPM RANGE
0.26 -0.30 10x6 10x5~7 - 11x4~5 10000 ~ 11000
0.40 - 0.45 11x6 11x6~7 - 12x5~6 10000 ~ 11000
0.48 - 0.56 11x7 11x7~8 - 12x6~7 - 13x5~6 10000 ~ 11000
0.63 - 0.72 12x7 12x7~9 - 13x6~7 10000 ~ 11000
0.80 - 0.91 14x7 14x7~8 - 15x6~10 - 16x6~8 10000 ~ 11000
1.00 - 1.20 14x8 10x7~9 - 11x6~8 - 12x5~7 9000 ~ 10000
1.40 - 1.50 16x8 16x8~12 - 17x8~10 - 18x6 8500 ~ 9500
1.80 - 2.00 17x8 16x10~12 - 17x8~10 - 18x8 8000 ~ 9500
2.40 20x8 18x10~12 - 20x6~8 7500 ~8500
2.70 20x10 20x8~12 - 21x8~10 7500 ~ 8500
3.00 - 3.20 21x10 20x10~12 - 21x8~10 - 22x8 7500 ~ 8500

 

Gasoline / Petrol Engine
ENGINE SIZE IDEAL PROP SIZE PROPELLER SIZE RANGE IDEAL RPM RANGE
1.40 -1.80 16x8 16x8~10 - 17x8~10 - 18x8 8500 ~ 9500
40cc 20x8 18x10~12 - 19x10 - 20x8~10 6500 ~ 7800
45cc 20x10 20x10~12 - 21x8~10 - 22x8 6000 ~ 7500
50cc 21x10 20x12 - 21x10~12 - 22x8~10 6000 ~ 7200
60cc 22x10 22x10~12 - 24x8~10 - 26x8 6000 ~ 7200
75cc 24x10 24x12 - 26x10~12 6000 ~ 6800
100cc 26x10 26x10~12 - 28x10 6000 ~ 6500
150cc 32x12 30x10~12 - 32x10~12 5500 ~ 6000
200cc 31x11 32x12~14 - 34x10~12 - 36x10 5000 ~ 6000

 

To convert cubic inches to cubic centimetres

multiply by 16.39

To convert cubic centimetres to cubic inches

multiply by 0.06102

Remember when we talk about a '40' sized engine we mean 0.4 cubic inches