BetaFPV Gemfan 1811 Propellers – 45 mm Three-Blade Propellers for Micro FPV Drones

BetaFPV Gemfan 1811 propellers are lightweight, precisely balanced three-blade propellers designed for micro FPV and whoop drones with 1.5 mm motor shafts. Their 45 mm diameter, 1.8-inch pitch, and low rotational mass help deliver quick throttle response, precise control, and stable flight performance. They are well suited to compact drones requiring efficient thrust, excellent manoeuvrability, and smooth handling when flying indoors or outdoors.

Made from durable polycarbonate, each propeller weighs only 0.32 grams. Low weight reduces the load on the motors and minimises rotational inertia, allowing the drone to respond quickly to pilot inputs. This is particularly important during freestyle flights, rapid changes of direction, and technical manoeuvres where precise throttle control directly affects handling.

Three-blade design with a 1.8-inch pitch

The three-blade design of BetaFPV Gemfan 1811 propellers provides a balanced combination of thrust, stability, and precise control. Three blades generate consistent thrust and help maintain controlled flight characteristics during both steady cruising and faster manoeuvres. Compared with propellers featuring a smaller pitch or diameter, the 1.8-inch pitch moves more air with each revolution, giving a micro drone powerful and immediate response.

Precise factory balancing helps reduce vibration during flight. Lower vibration contributes to smoother handling, reduces stress on components, and may improve the quality of footage recorded by the onboard camera. Properly balanced propellers also allow the flight control system to correct the drone’s movements more accurately.

Compact and lightweight construction

BetaFPV Gemfan 1811 propellers have a diameter of 45 mm, and each propeller weighs just 0.32 grams. Maximum blade width is 8.7 mm, while the centre section is 4.4 mm thick. These dimensions provide the rigidity and blade area required to generate efficient thrust while maintaining the low weight expected from a micro drone propeller.

Low rotational mass allows the motors to change speed quickly. As a result, the drone responds immediately when throttle is increased or reduced, helping it maintain altitude, pass accurately through racing gates, and regain a stable attitude after sudden manoeuvres. The propellers are therefore suitable for recreational freestyle flying, indoor flights, and everyday use with small whoop drones.

Compatibility with 1.5 mm motor shafts

The centre hole has an inner diameter of 1.5 mm. Before installation, make sure the shaft diameter of the motors matches this measurement. A correctly sized motor shaft ensures a secure fit and helps prevent play, uneven rotation, and resulting vibration.

BetaFPV recommends using Gemfan 1811 propellers with 1102 Brushless Motors (2026). They are also compatible with Meteor75 Pro II O4 and other micro FPV drones with similar specifications that use 45 mm propellers and 1.5 mm motor shafts. The propellers are intended for drones in the approximately 100-gram take-off weight class.

Compatibility depends not only on shaft diameter but also on the drone frame and the internal dimensions of its propeller guards. Before purchasing, make sure the frame can accommodate 45 mm propellers and that the rotating blades will not touch the propeller guards or other parts of the drone.

Durable polycarbonate for everyday flying

Polycarbonate, or PC, combines low weight, good rigidity, and impact resistance. These properties are particularly important for micro whoop drones, which are often flown indoors, through gates, or in other confined environments. Collisions with walls, furniture, and course elements are common in such conditions, and the durable material helps the propellers withstand regular use.

Nevertheless, the condition of the propellers should be checked regularly. A cracked, bent, or chipped propeller may cause vibration, reduce thrust, and impair the drone’s handling. Damaged propellers should be replaced immediately, and propellers of the same model and in similar condition should be used to ensure consistent flight performance.

BetaFPV Gemfan 1811 propellers for maintenance and upgrades

BetaFPV Gemfan 1811 propellers are suitable for replacing worn or damaged original propellers and for fine-tuning the flight performance of a compatible micro drone. Their 45 mm diameter, 1.8-inch pitch, 0.32-gram weight, and three-blade design provide quick response, efficient thrust, and controlled flight performance.

The set includes four BetaFPV Gemfan 1811 propellers. Before purchasing, make sure your drone’s motors have 1.5 mm shafts and that its frame and propeller guards can accommodate 45 mm propellers.