Gemfan Vortex 14x8.5 Glass Fiber Nylon Electric Propeller (1 pc)

The Gemfan Vortex 14x8.5 is a two-blade, 14-inch propeller with an 8.5-inch pitch for electric fixed-wing aircraft, sold as a single prop. The mid pitch balances pulling power with forward speed, a practical all-round choice for 14-inch sport, scale and fixed-wing UAV airframes. Choose standard (E, CCW) or reverse (R, CW) rotation from the options.

Key features

• Glass-fibre-reinforced nylon: rigid, tough and resistant to bending, so the blades hold their pitch under load.
• Vortex airfoil: CFD-optimised blade profile with slim tips and a frosted leading edge that helps keep airflow attached at high RPM.
• Anti-slip hub: a textured hub surface grips the prop adapter and resists slipping in flight.
• Factory balanced: dynamically balanced for smooth, low-vibration running.
• Adapter rings included: 6.35 mm (1/4 in) centre hole plus six rings for 3, 3.17, 4, 5, 6 and 8 mm shafts and prop adapters.

Specifications

• Diameter: 14 in
• Pitch: 8.5 in
• Blades: 2
• Rotation: CCW (E, standard) or CW (R, reverse)
• Material: Glass-fibre-reinforced nylon
• Hub diameter: 20.4 mm
• Hub thickness: 12.6 mm
• Centre hole: 6.35 mm (1/4 in)
• Adapter rings: 3, 3.17, 4, 5, 6 and 8 mm
• Weight: 40.3 g
• Colour: Grey
• Pack: 1 propeller

Pick the E (CCW) prop for a conventional front-mounted tractor motor and the R (CW) prop for a pusher layout. On a twin, fit one of each with the motors spinning in opposite directions so their torque cancels. After any prop change, check current draw with a wattmeter on the bench so the motor and ESC stay within their ratings.