APC 9 x 8.5 Composite .40-Size Pylon Propeller This is an APC 9 x 8.5 Composite .40-Size Pylon Propeller. APC propellers are CAD-designed and manufactured to be lighter, stronger and produce less noise and more power than typical propellers. APC model airplane propellers have enjoyed strong acceptance and growth since their introduction in 1989. They are especially popular in pattern and racing events. The performance and low noise advantages are largely due to the precision methods Landing Products uses to design and manufacture APC propellers. Specifications: • Length: 9 Inches • Pitch: 8.5 Inches • Hub Diameter: 0.90 Inches • Hub Thickness: 0.49 Inches • Shaft Diameter: 1/4 Inch • Weight: 1.06 Ounces • Type: .40-Size Pylon