This is the APC 8x4.1SF Slow Flyer "SF3D" Propeller. APC propellers are manufactured using a pultrusion process which allows for a higher fiber (60%) to resin (nylon binder) density. This provides substantially higher strength and stiffness than glass-filled nylon. The additional stiffness is beneficial to control vibration resonance response. The higher strength allows the use of thinner cross-sections, beneficial to weight and aerodynamic efficiency.

Features:

• Computer-optimized design gives these props a thinner profile and more "bite" with less noise
• Lightweight molded nylon construction reduces rotating mass for higher output and longer life
• Reinforcing fibers help maintain true, constant pitch at any RPM

Specifications:

• Propeller Diameter: 8in (203.2mm)
• Pitch: 4.1in (104.14mm)
• Hub Diameter: 0.5in (12.7mm)
• Hub Thickness: 0.16in (4.064mm)
• Shaft Diameter: 0.22in (5.5mm)
• Weight: 0.16oz (4.54g)
• Rotation: CCW (Standard/Tractor)