Keystone Radio Control Club
Choose The Right Propeller

Choose The Right Propeller - 2 & 4 Stroke Engines

While all engines produce power the Propeller is essential to transmit this power. A more efficient propeller will transmit more power to the air. It would be fair to say that these recommended props are often much larger than those typically used in the USA but this helps significantly with noise reduction and therefore we will go with a larger prop.  The engines will not bog down with these props, they just won't quite develop all the power they could.  Though to be fair we do overpower anyway.  Prop sizes are only slightly above US recommendations.  If you field is noise sensitive (as many are) then head for one of the large sizes. These figures are merely estimates - do not take them as gospel. They are merely a rough guide to get you started.

Engine Size Ideal Prop Size Propeller Size Range Engine Type Ideal RPM Range
0.10 7x4 7x4~6, 8x4 2-Stroke Glow 14000~16000rpm
0.15 8x4 7x5~6, 8x4~6 2-Stroke Glow 14000~16000rpm
0.25 9x5 9x4~6, 10x4~5 2-Stroke Glow 12000~15000rpm
0.32-0.36 10x5 9x6~8, 10x5~6, 11x4~5 2-Stroke Glow 12000~15000rpm
0.40 11x5 10x6~8, 11x5~7, 12x5~6 2-Stroke Glow 11000~12000rpm
0.46 11x6 10x7~9, 11x6~8, 12x5~7 2-Stroke Glow 10000~12000rpm
0.53 11x7 10x8~10, 11x7~9, 12x6~8 2-Stroke Glow 10000~11000rpm
0.61 13x6 12x8~10, 13x6~7, 14x5~6 2-Stroke Glow 9500~11000rpm
0.75 13x7 12x9~11, 13x7~8, 14x6~7 2-Stroke Glow 9500~10500rpm
0.91-1.08 14x6 13x10~11, 14x6~8, 15x6~8 2-Stroke Glow 9000~10000rpm
1.20-1.35 16x8 15x8~10, 16x8~10, 17x8 2-Stroke Glow 8500~9500rpm
1.40-1.80 18x8 17x8~10, 18x8~10, 20x6~8 2-Stroke Glow 8000~9000rpm
2.10 20x10 20x10, 22x8 2-Stroke Glow 8000~8500rpm
         
Engine Size Ideal Prop Size Propeller Size Range Engine Type Ideal RPM Range
0.26-0.30 10x6 10x5~7, 11x4~5 4-Stroke Glow 10000~11000rpm
0.40-0.45 11x6 11x6~7, 12x5~6 4-Stroke Glow 10000~11000rpm
0.48-0.56 11x7 11x7~8, 12x6~7, 13x5~6 4-Stroke Glow 10000~11000rpm
0.63-0.72 12x7 12x7~9, 13x6~7 4-Stroke Glow 10000~11000rpm
0.80-0.91 14x7 13x8~11, 14x7~9, 15x5~7 4-Stroke Glow 10000~11000rpm
1.00-1.20* 14x8 14x7~8, 15x6~10, 16x6~8 4-Stroke Glow 9000~10000rpm
1.40-1.50** 16x8 16x8~12, 17x8~10, 18x6 4-Stroke Glow 8500~9500rpm
1.80-2.00 17x8 16x10~12, 17x8~10, 18x8 4-Stroke Glow 8000~9500rpm
2.40 20x8 18x10~12, 20x6~8 4-Stroke Glow 7500~8500rpm
2.70 20x10 20x8~12, 21x8~10 4-Stroke Glow 7500~8500rpm
3.00-3.20 21x10 20x10~12, 21x8~10, 22x8 4-Stroke Glow 7500~8500rpm
         
Engine Size Ideal Prop Size Propeller Size Range Engine Type Ideal RPM Range
1.40-1.80 16x8 16x8~10, 17x8~10, 18x8 Gas 8500~9500rpm
40cc 20x8 18x10~12, 19x10, 20x8~10 Gas 6500~7800rpm
45cc 20x10 20x10~12, 21x8~10, 22x8 Gas 6000~7500rpm
50cc 21x10 20x12, 21x10~12, 22x8~10 Gas 6000~7200rpm
60cc 22x10 22x10~12, 24x8~10, 26x8 Gas 6000~7200rpm
75cc 24x10 24x12, 26x10~12 Gas 6000~6800rpm
100cc 26x10 26x10~12, 28x10 Gas 6000~6500rpm
150cc 32x12 30x10~12, 32x10~12 Gas 5500~6000rpm
200cc 34x11 32x12~14, 34x10~12, 36x10 Gas 5000~6000rpm
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