PROP CHARTS

PROP CHART FOR 2-STROKE ENGINES

ENGINE SIZE (cu. in.) STARTING PROP. ALTERNATE PROPS
.049 6 X 3 5 1/4X4, 5 1/2X4, 6X3 1/2, 6X4, 7X3
.09 7 X 4 7X3, 7X4 1/2, 7X5
.15 8 X 4 8X5, 8X6, 9X4
.19 - .25 9 X 4 8X5, 8X6, 9X5
.29 - .30 9 X 6 9X7, 9 1/2X6, 10X5
.35 - .36 10 X 6 9X7, 10X5, 11X4
.40 10 X 6 9X8, 11X5
.45 - .47 10 X 7 10X6, 11X5, 11X6, 12X4
.50 - .53 11 X 6 10X7, 10X8, 11X7, 12X4, 12X5
.60 - .61 11 X 7 11X7 1/2, 11X8, 12X6,
.70 - .75 12 X 6 11X8, 12X7, 13X6, 14X4
.78 - .80 13 X 6 12X8, 14X4, 14X5
.90 - .91 14 X 6 13X8, 13X10, 15X6,
1.08 16 X 6 15X8, 15X10, 16X6
1.20 16 X 8 15X12, 16X10, 18X6
1.50 18 X 6 16X12, 18X8, 20X6
1.80 18 X 8 18X10, 20X6, 20X8, 22X6
2.00 20 X 8 18X10, 20X6, 20X8, 22X6, 22X8

PROP CHART FOR 4 STROKE ENGINES

ENGINE SIZE (cu. in.) STARTING PROP. ALTERNATE PROPS
.20 - .21 9 x 6 9x5, 10x4, 10x5
.40 11 x 6 10x6, 10x7, 11x4, 11x5, 11x7, 12x4, 12x5
.45 - .52 11 x 6 10x7, 10x8, 11x7, 11x8, 12x5, 12x6
.60 - .65 12 x 6 11x8, 12x7, 12x8, 13x6
.70 - .80 13 x 6 12x8, 13x8, 14x4, 14x6
.90 - .91 14 x 6 13x6, 13x8, 14x8, 15x6
1.20 16 x 6 14x8. 15x8,15x10, 16x8, 16x10, 18x5, 18x6
1.50 - 1.60 16 x 8 15x10, 16x6, 18x6, 18x8, 20x6
2.40 18 x 10 18x12, 20x8, 20x10
2.70 20 x 8 18x10, 18x12, 20x10
3.00 20 x 10 18x12, 22x8, 22x10

NOTE: For 3 bladed props, as a rule of thumb,you would use one 1" shorter. Example: If you use a 12x6 - 2 blade prop you would use a 11x6 - 3 blade prop.