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Prop Chart For Two – Stroke Engines
| Alternate Propellers |
Starting Prop |
Engine Size |
| 5.25×4, 5.5×4, 6×3.5, 6×4, 7×3 |
6×3 |
.049 |
| 7×3,7×4.5,7×5 |
7×4 |
.09 |
| 8×5,8×6,9×4 |
8×4 |
.15 |
| 8×5,8×6,9×5 |
9×4 |
.19 – .25 |
| 9×7,9.5×6,10×5 |
9×6 |
.20 – .30 |
| 9×7,10×5,11×4 |
10×6 |
.35 – .36 |
| 9×8, 11×5 |
10×6 |
.40 |
| 10×6,11×5,11×6,12×4 |
10×7 |
.45 |
| 10×8,11×7,12×4,12×5 |
11×6 |
.50 |
| 11×7.5, 11×7.75, 11×8,12×6 |
11×7 |
.60 – .61 |
| 11×8,12×8,13×6,14×4 |
12×6 |
.70 |
| 12×8,14×4,14×5 |
13×6 |
.78 – .80 |
| 13×8,15×6,16×5 |
14×6 |
.90 – .91 |
| 15×8,18×5 |
16×6 |
1.08 |
| 16×10,18×5,18×6 |
16×8 |
1.20 |
| 18×8,20×6 |
18×6 |
1.50 |
| 18×10,20×6,20×8,22×6 |
18×8 |
1.80 |
| 18×10,20×6,20×10,22×6 |
20×8 |
2.00 |
Prop Chart For Four – Stroke Engines
| Alternate Propellers |
Starting Prop |
Engine Size |
| 9×5,10×5 |
9×6 |
.20 – .21 |
| 10×6,10×7,11×4,11×5.11×7,11×7.5,12×4,12×5 |
11×6 |
.40 |
| 10×6,10×7,10×8,11×7,11×7.5,12×4,12×5,12×6 |
11×6 |
.45 – .48 |
| 11×7.5,11×7.75,11×8,12×8,13×5,13×6,14×5,14×6 |
12×6 |
.60 – .65 |
| 12×8,13×8,14×4,14×6 |
13×6 |
.80 |
| 13×6,14×8,15×6,16×6 |
14×6 |
.90 |
| 14×8,15×6,15×8,16×8,17×6,18×5,18×6 |
16×6 |
1.20 |
| 15×6,15×8,16×8,18×6,18×8,20×6 |
18×6 |
1.60 |
| 18×12,20×8,20×10 |
18×10 |
2.40 |
| 18×10,18×12,20×10 |
20×8 |
2.70 |
| 18×12,20×10 |
20×10 |
3.00 |
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