Gemfan Vortex 18x10 Glass Fiber Nylon Electric Propeller (1 pc)

The Gemfan Vortex 18x10 is a two-blade, 18-inch propeller with a 10-inch pitch for large electric fixed-wing aircraft and UAVs, sold as a single prop. The modest pitch for its diameter favours thrust and efficient cruise on heavy, slower-flying airframes. This is the standard-rotation E version, listed as CCW.

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: 18 in
• Pitch: 10 in
• Blades: 2
• Rotation: CCW (E, standard)
• Material: Glass-fibre-reinforced nylon
• Hub diameter: 31.5 mm
• Hub thickness: 12.5 mm
• Centre hole: 6.35 mm (1/4 in)
• Adapter rings: 3, 3.17, 4, 5, 6 and 8 mm
• Weight: approx. 87 g
• Colour: Grey
• Pack: 1 propeller

The E version suits a conventional front-mounted (tractor) motor; a pusher layout or the opposite motor of a counter-rotating twin needs the reverse-rotation R version. An 18-inch prop stores a lot of energy: bench-check current draw with a wattmeter and keep clear of the prop arc whenever the battery is connected.