If you attended the NMPA Convention this past November, perhaps you saw the panel discussion on repairing new propeller designs. Although many popular designs still use a flat-face, the industry has seen a notable increase in new, contemporary propeller designs such as Veem’s Sportfish and Michigan’s Marlin props. These propellers are deliberately designed for high performance and feature unique geometries that manufactured by CNC machining.
If you measure one of these new propellers, you are likely to notice that the local pitch varies across the blade surface. Let’s quickly review some of these variations…
First, let’s review the propeller from the root to the blade tip. On a traditional propeller, we would expect that the section pitch to be the same at all radii – this is referred to as constant pitch. For example, on a 20 inch pitch propeller with constant pitch, the 50R, 70R, and 90R all measure to 20 inches pitch.
We wish everyone a successful 2020 and look forward to seeing all of you at the 2020 convention!
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