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This reference provided by Jim Ewing of Great Hobbies. The chart is provided by Top FLite.
Modelers who have been in the hobby for a year or two develop a feel for the best
size propellers for each model airplane/engine combination. The chart below is
intended to give the beginner a starting point so that the best performance can be
attained. In general, engines want to be operated at a particular RPM, where they
can reach maximum power. Too large a diameter and/or high a pitch and the engine
will not rev up to its best power band. On the other hand, too small a diameter and/or
pitch and the engine will over-rev and not deliver the best thrust. Often, heavy and
slow airplanes should have a large diameter/lower pitch while a light and fast plane
should have a smaller diameter/higher pitch.
How to use this Chart
- Find your engine along the bottom axis.
- Follow the line up to where it intersects with the shaded area
- Follow each point within the shaded area to its corresponding prop size on the left axis.
This will be your appropriate size range.
Note: Four Stroke engines are typically higher torque engines and should use the larger props indicated in the range.
Recommended prop ranges will vary depending on your particular engine and airplane. This chart represents average prop usage and should be used only as a general guideline. Always refer to the manufacturer's instructions included with your engine.
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