Prop Chart Submitted by:  Dave Schmeder

2-Stroke Glow Engines Engine Size Ideal Prop Size Size Range Ideal RPM Range 0.10 7x4 7x4~6, 8x4 14000~16000rpm 0.15 8x4 7x5~6, 8x4~6 14000~16000rpm 0.25 9x5 9x4~6, 10x4~5 12000~15000rpm 0.32 - 0.36 10x5 9x6~8, 10x5~6, 11x4~5 12000~15000rpm 0.40 11x5 10x6~8, 11x5~7, 12x5~6 11000~12000rpm 0.46 11x6 10x7~9, 11x6~8, 12x5~7 10000~12000rpm 0.53 11x7 10x8~10, 11x7~9, 12x6~8 10000~11000rpm 0.61 13x6 12x8~10, 13x6~7, 14x5~6 9500~10500rpm 0.75 13x7 12x9~11, 13x7~8, 14x6~7 9500~10500rpm 0.91 - 1.08 14x6 13x10~11, 14x6~8, 15x6~8 9000~10000rpm 1.20 - 1.35 16x8 15x8~10, 16x8~10, 17x8 8500~9500rpm 1.40 - 1.80 18x8 17x8~10, 18x8~10, 20x6~8 8000~9000rpm 2.10 20x10 20x10, 22x8 8000~8500rpm 4-Stroke Glow Engines Engine Size Ideal Prop Size Size Range Ideal RPM Range 0.26 - 0.30 10x6 10x5~7, 11x4~5 10000~11000rpm 0.40 - 0.45 11x6 11x6~7, 12x5~6 10000~11000rpm 0.48 - 0.56 11x7 11x7~8, 12x6~7, 13x5~6 10000~11000rpm 0.63 - 0.72 12x7 12x7~9, 13x6~7 10000~11000rpm 0.80 - 0.91 14x7 13x8~11, 14x7~9, 15x5~7 10000~11000rpm 1.00 - 1.20 14x8 14x7~8, 15x6~10, 16x6~8 9000~10000rpm 1.40 - 1.50 16x8 16x8~12, 17x8~10, 18x6 8500~9500 1.80 - 2.00 17x8 16x10~12, 17x8~10, 18x8 8000~9500rpm 2.40 20x8 18x10~12, 20x6~8 7500~8500rpm 2.70 20x10 20x8~12, 21x8~10 7500~8500rpm 3.00 - 3.20 21x10 20x10~12, 21x8~10, 22x8 7500x8500rpm Gasoline Engines Engine Size Ideal Prop Size Size Range Ideal RPM Range 1.40 - 1.80 16x8 16x8~10, 17x8~10, 18x8 8500~9500rpm 40cc 20x8 18x10~12, 19x10, 20x8~10 6500~7800rpm 45cc 20x10 20x10~12, 21x8~10, 22x8 6000~7500rpm 50cc 21x10 20x12, 21x10~12, 22x8~10 6000~7200rpm 60cc 22x10 22x10~12, 24x8~10, 26x8 6000~7200rpm 75cc 24x10 24x12, 26x10~12 6000~6800rpm 100cc 26x10 26x10~12, 28x10~12 5500~6500rpm 150cc 32x12 30x10~12, 32x10~12 5500~6000rpm 200cc 34x11 32x12~14, 34x10~12, 36x10 5000~6000rpm