Install the prop with the
curved side of the blade facing forward and tighten the prop nut or bolt with
the proper size wrench.| Alternate Propellors | Starting Prop | Engine Size |
| 5.25x4, 5.5x4, 6x3.5, 6x4, 7x3 | 6x3 | .049 |
| 7x3,7x4.5,7x5 | 7x4 | .09 |
| 8x5,8x6,9x4 | 8x4 | .15 |
| 8x5,8x6,9x5 | 9x4 | .19 - .25 |
| 9x7,9.5x6,10x5 | 9x6 | .20 - .30 |
| 9x7,10x5,11x4 | 10x6 | .35 - .36 |
| 9x8, 11x5 | 10x6 | .40 |
| 10x6,11x5,11x6,12x4 | 10x7 | .45 |
| 10x8,11x7,12x4,12x5 | 11x6 | .50 |
| 11x7.5, 11x7.75, 11x8,12x6 | 11x7 | .60 - .61 |
| 11x8,12x8,13x6,14x4 | 12x6 | .70 |
| 12x8,14x4,14x5 | 13x6 | .78 - .80 |
| 13x8,15x6,16x5 | 14x6 | .90 - .91 |
| 15x8,18x5 | 16x6 | 1.08 |
| 16x10,18x5,18x6 | 16x8 | 1.20 |
| 18x8,20x6 | 18x6 | 1.50 |
| 18x10,20x6,20x8,22x6 | 18x8 | 1.80 |
| 18x10,20x6,20x10,22x6 | 20x8 | 2.00 |
| Alternate Propellers | Starting Prop | Engine Size |
| 9x5,10x5 | 9x6 | .20 - .21 |
| 10x6,10x7,11x4,11x5.11x7,11x7.5,12x4,12x5 | 11x6 | .40 |
| 10x6,10x7,10x8,11x7,11x7.5,12x4,12x5,12x6 | 11x6 | .45 - .48 |
| 11x7.5,11x7.75,11x8,12x8,13x5,13x6,14x5,14x6 | 12x6 | .60 - .65 |
| 12x8,13x8,14x4,14x6 | 13x6 | .80 |
| 13x6,14x8,15x6,16x6 | 14x6 | .90 |
| 14x8,15x6,15x8,16x8,17x6,18x5,18x6 | 16x6 | 1.20 |
| 15x6,15x8,16x8,18x6,18x8,20x6 | 18x6 | 1.60 |
| 18x12,20x8,20x10 | 18x10 | 2.40 |
| 18x10,18x12,20x10 | 20x8 | 2.70 |
| 18x12,20x10 | 20x10 | 3.00 |
Install the prop with the
curved side of the blade facing forward and tighten the prop nut or bolt with
the proper size wrench. Recheck the tightness of
the nut or bolt often, especially on wood props which tend to compress and
loosen more often. When starting the engine,
keep spectators at least 20 feet clear of the model and out of the path of the
propeller. Keep hands away from the
prop as much as possible. Use a chicken stick or and electic starter. Keep face and body out of
prop arc as engine is started and run. Make all adjustments from
behind the prop except on pusher prop installations. Never throw anything into
the prop to stop the engine. Use a kill switch or pinch off the engine's fuel
supply. Discard any prop with
nicks, scratches, splits, cracks or any other sign of damage. Never attempt to
repair, alter or bend a prop. Don't run an engine in
areas of loose gravel or sand for the prop can throw such material into your
face and eyes. It's not a bad idea to wear eye protection. Keep loose clothing, shirt
sleeves, and other such items away from the prop and avoid carrying objects that
can fall into the prop such as pens, screwdrivers, etc. Be sure to keep the glow
driver wire out of the prop path. If a spinner is used, be
certain that it's edges are not in contact with the propeller blades.