MT-Propeller recently flight-tested what it said is a world’s first: an 11-blade propeller. Mounted to the right-hand Pratt & Whitney Canada PT6A-135A turboprop engine on a Piper PA-31T Cheyenne , the initial flight test this fall showed “very promising results,” according to the Germany-headquartered OEM.

Those results included a 15 percent increase in static thrust over a standard, certified five-blade propeller. “This propeller system combined with a low RPM power supply from a turbine or an electric engine opens new possibilities for performance, efficiency, and noise,” the company said. Transporting Wind Turbine Blades

It’s not clear if or when MT might pursue a supplemental type certificate for the propeller. In 2019, the company also flight-tested a nine-blade prop on the Cheyenne, which MT said can help a propeller-driven airplane reach speeds of up to 430 knots—depending on design—while reducing fuel consumption.

https://www.ainonline.com/aviation-news/general-aviation/2022-12-19/mt-flight-tests-11-blade-propeller

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