| Engines and Propellers A Simple comparison of which 2-cycle engine uses which 2-blade comes from my own observations over the years. Generally, in each range, the larger or more powerful the prop, the lower the engine RPM output. For 3-blade props I've always gone with the lower size. Ex: a .45 might use a 11x6 2-blade prop but would use a 10x6 3-blade prop. |
| 6x4 - 7x4 7X4 - 8X4 8X4 - 9X6 9X7 - 10X6 9X7 - 10X8 10X5 - 11X6 11X5 - 12X8 13X6 - 15X8 14X6 - 16X6 18X6 - 20X10 20X8 - 24X10 |
| .15 .25 .32 .35 .40 .45 .60 .90 1.2 2.8 4.2 |
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