https://www.mt-propeller.com: Another World’s First Takes First Flight – The 11-bladed Propeller!
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On a PA31T1 equipped with the P&W PT6A-135A turbines, the World’s first 11-bladed propeller took the sky with an impressive noise and sound signature.
The very promising results in static thrust, 15% increase over the standard certified 5-bladed propeller, and the jet-noise signature showed another time what could be possible in the propeller developments.
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They've worked their way up through 7- and 9-blade versions.
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