Gemfan 1209-4 31mm Quad-Blade Propeller

The Gemfan 1209-4 is a lightweight 31mm quad-blade propeller engineered for 65mm micro whoop builds. Featuring a 0.9-inch pitch and a four-blade profile, these props provide enhanced grip and throttle authority for precise indoor flying and tight racing circuits. They are an ideal match for ultra-light 0702 to 0803 brushless motors.

Key features

• Quad-blade geometry delivers increased cornering traction and immediate low-end thrust compared to bi-blade or tri-blade alternatives.
• Moulded from durable, low-weight polycarbonate to maintain high RPMs and maximise motor efficiency.
• Available in multiple shaft bore sizes to accommodate a wide variety of standard whoop stators.

Specifications

• Diameter: 31mm
• Pitch: 0.9 inch
• Blades: 4
• Material: Polycarbonate
• Hub Inner Diameter: 0.8mm, 1.0mm, or 1.5mm (depending on variant)
• Weight: 0.21g

Always confirm your motor's shaft diameter before selecting a hub size. The 0.8mm and 1.0mm options are standard for most 0702 and 0802 whoop motors, while the 1.5mm variant fits slightly larger micro stators with a thicker shaft.