The 635A-2820-17 is a type of aircraft propeller manufactured by Concord Aerospace. It is designed for use on single and twin-engine aircraft, such as the Cessna 170, Cessna 180, and Mooney M20. The 635A-2820-17 propeller is made from NAB aluminum and is fitted with a three-bladed reversible design. It has 8.5 degree blade angle and a blade tip diameter of about 28 inches. The maximum operating RPM for this propeller is 2,680 RPM, with a maximum static thrust of 1,500 pounds. This propeller has an 11 inch hub size, and a weight of approximately 28 pounds.