Prop Chart for Two-Stroke Engines

Engine Size
Starting Prop Running Prop
.049 6x3 5.5x4 - 6x4 - 7x3
0.9 7x4 7x3 - 7x4 - 7x5
.15 8x4 8x5 - 8x6 - 9x4
.19 - .25 9x4 8x5 - 8x6 - 9x5
.20 - .30 9x6 9x7 - 9.5x6 - 10x5
.35 10x4 9x7 - 10x5 - 11x4
.40 10x6 9x8 - 11x5
.45 - .46 10x7 10x8 - 11x6 - 12x4
.50 11x6 10x8 - 11x7 - 12x5
.60 - .61 11x7 11x7.5 - 11x8 - 12x6
.70 12x6 11x8 - 12x8 - 13x6
.80 13x6 12x8 - 14x4 - 14x5
.90 - .91 14x6 13x8 - 15x6 - 16x5
1.08 16x6 15x8 -18x5
1.20 16x8 16x10 - 18x5 - 18x6
1.50 18x6 18x8 - 20x6
1.80 18x8 18x10 - 20x6 - 22x6
2.00 20x8 18x10 - 20x10 - 22x8

 

Prop Chart for Four-Stroke Engines

Engine Size Starting Prop Running Prop
.20 - .21 9x5 9x6 - 10x5
.40 11x6 10x6 - 10x8 - 11x7 - 12x5
.45 - .48 11x6 10x8 - 11x7 - 12x6
.60 - .65 12x6 11x8 - 12x8 - 13x5 - 14x6
.80 13x6 12x8 - 13x8 - 14x6
.90 14x6 13x6 - 15x6 - 16x6
1.20 16x6 14x8 - 15x8 - 16x8 - 18x6
1.60 18x6 15x6 - 16x8 - 18x8 - 20x6
2.40 18x10 18x12 - 20x8 - 20x10
2.70 20x8 18x10 - 18x12 - 20x10