RCU Forums - View Single Post - "6-10" PITCH PROPELLERS
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Old 02-02-2006, 03:58 PM
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The 6-10 style prop has a flat blade that presents a variable pitch to the airflow along the blade. The idea is to ensure that some part of the blade is always working over a wide range of airspeeds. That is, some part of the blade will be stalled and some part will add braking. The part doing the work will vary depending on airspeed.

The more familiar constant pitch prop is designed to work best in a small speed range, determined by the pitch and the RPM, where the entire blade is working. It is most efficient within the design speed range and the efficiency drops off when outside of this range.

The flat pitch or paddle prop is widely used in ultra-lights because their speed varies quite a bit relative to their normal flight envelop [max speed relative to minimum speed ratios]. It guarantees that some part of the prop is working. Not very efficient but effective.