Our long history has resulted in more than 300 field-proven designs, providing a solid foundation when studying new applications, as well as speeding up the certification process. Take a look at our major OEM application overview.

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Wondering how to get in touch with us? Click here for key OEM/Modifier contact information.

Getting the most out of an existing aircraft is what modifiers - and Hartzell's engineers - do best through our modifier program.

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I'm a modifier developing an IO-520 conversion with over-speed for the Cessna 182. Will Hartzell design a propeller for my application? Frequently asked questions about Hartzell's modifier program.