This Master Airscrew 14x7 Scimitar Profile Propeller is from Windsor Propeller Company's Antique Series. FEATURES: The Scimitar Series (pronounced simitar) features a high performance Scimitar shape with swept-back, narrow tips & undercambered blades. The Scimitar shape generates greater thrust at lower RPM, resulting in less noise. Made of lightweight, black, glass-filled nylon. Follows designs made by Tony Fokker in 1918. A terrific finishing touch on an antique aircraft with a four-stroke engine. Propeller is totally fuel-proof. INCLUDES: One 14x7 Antique Scimitar Propeller. SPECS: Propeller Diameter: 14" (355mm) Propeller Pitch: 7" (178mm) REQUIRES: Depending on the engine crankshaft size, the propeller may need to be reamed to a larger size using GPMQ5005 (SAE) or GPMQ5007 (Metric).