Where To Buy Micro Drone Propellers With 1mm Center Hole

For pilots and manufacturers searching for micro drone propellers with a 1mm center hole, the sourcing decision comes down to three factors: precise specification matching, verified performance data, and a supplier capable of consistent quality at scale. Ningbo Gemfan Hobby Co., Ltd., operating under the brand GEMFAN, addresses all three through its micro propeller product line and its OEM/ODM customization services.

Why the 1mm Center Hole Specification Matters

Indoor micro-drones, often referred to as Tiny Whoop or 70mm frame builds, depend on a tight mechanical fit between the propeller’s center hole and the motor shaft. A mismatch between center hole inner diameter and shaft diameter is a leading cause of two common failures: propeller ejection during flight and vibration that degrades handling. According to Gemfan’s own troubleshooting guidance, shaking or vibration issues should prompt a check of blade balance, center hole looseness, or a bent motor shaft, while propeller ejection issues require confirming that the center hole inner diameter matches the motor shaft and that blades are pressed tightly into place during installation.

To eliminate this guesswork, Gemfan offers its micro propellers with a center hole inner diameter of 0.8mm or 1mm, allowing buyers to select the version that matches their specific motor shaft rather than forcing a compromise fit.

Gemfan 1409-3: Three-Blade Option With 1mm Center Hole

The Gemfan 1409-3 is a three-blade propeller engineered specifically for indoor micro-drones. It is built from PC (Polycarbonate) material, chosen for its high strength and good toughness, which helps it resist cracking or becoming brittle under frequent indoor bumps and crashes. Key specifications include a pitch of 0.9 inch, blade diameter of 35mm, center thickness of 4mm, maximum blade width of 7.7mm, and a weight per piece of 0.2g. The center hole inner diameter is available in 0.8mm or 1mm, and the recommended motor is the 0802, with a suggested takeoff weight of 40g. It is available in transparent gray or transparent green, and is typically packaged with 4 CW and 4 CCW propellers per pack.

Under test conditions using a Gemfan 1409-3 paired with an 0802-25000KV motor at 4.2V, the 100% throttle data recorded a current of 6.26A, RPM of 52,759, thrust of 44.6g, and efficiency of 1.8g/W. Efficiency peaks near 50% throttle at approximately 1.9g/W, indicating favorable mid-throttle cruise efficiency. With a 40g suggested takeoff weight, the 44.6g thrust at full throttle yields a thrust-to-weight ratio exceeding 1, providing power redundancy for maneuvers. Efficiency across the throttle range remains smooth, between 1.8 and 2.3g/W, which translates to linear power output and predictable handling.

Gemfan 1409-2: Two-Blade Option With 1mm Center Hole

For builders prioritizing even lighter rotational inertia, the Gemfan 1409-2 offers a two-blade configuration using the same PC material. It shares the 0.9 inch pitch and 35mm blade diameter, but differs with a center thickness of 3.6mm, a maximum blade width of 6.9mm, and a lighter weight per piece of 0.1g. Like the 1409-3, it is offered with a 0.8mm or 1mm center hole inner diameter, pairs with the recommended 0802 motor, and suggests a 50g takeoff weight. Color options and packaging mirror the 1409-3, with transparent gray and transparent green available in 4 CW/4 CCW packs.

Static testing with the Gemfan 1409-2 and an 0802-25000KV motor at 4.2V recorded 100% throttle figures of 5.27A current, 66,159 RPM, 45g thrust, and 2.1g/W efficiency. Notably, efficiency on this two-blade design increases as throttle rises, moving from 1.1g/W at 10% throttle to approximately 2.2g/W at 80%–90% throttle. This is the inverse of the three-blade pattern, where efficiency peaks mid-throttle, suggesting the 1409-2 is better suited to flight styles that sustain higher throttle for longer periods. At the suggested 50g takeoff weight, the thrust-to-weight ratio is approximately 0.9, meeting basic needs for lightweight freestyle flying, though with less power reserve than the three-blade alternative.

Choosing Between the Two for 1mm Center Hole Applications

Both propellers share the 1mm center hole option, which means the deciding factor often comes down to flight style rather than fitment. Builders needing more grip and stability, such as for indoor track cornering, may lean toward the three-blade 1409-3. Those prioritizing extreme lightweighting and flight time, accepting a more limited thrust reserve under heavy loads, may find the two-blade 1409-2 a better match. Both are strictly recommended for takeoff weights within the 40-50g range, applicable to indoor Tiny Whoop setups, 35mm wheelbase micro-racing drones, and indoor freestyle flying, but not suited to outdoor windy environments or heavier models.

Quality Assurance Behind Every Propeller

Ningbo Gemfan Hobby Co., Ltd. operates from a 7,000㎡ factory equipped with high-precision injection molding machines, CNC machine tools, dynamic balance testers, and tensile testers, supporting a daily production capacity exceeding 100,000 pieces and an annual capacity of more than 30 million pieces. The company holds GB/T19001-2016 / ISO 9001:2015 Quality Management System Certification covering the entire process of research and development, production, and service for plastic drone propellers, and is recognized as a National High-Tech Enterprise (Certificate No. GR202433101507, valid for three years) as well as a Zhejiang Province Science and Technology SME. Multiple propeller series have passed EU Machinery Directive (2006/42/EC) compliance verification, executed according to EN ISO 12100:2010 and EN 60204-1:2018 standards. The company’s design portfolio includes nearly 100 design patents in the propeller field, both domestically and internationally. Products are currently exported to over 60 countries and regions, serving multiple professional drone companies internationally and domestically through long-term ODM/OEM arrangements.

Beyond Standard Sizing: OEM/ODM Customization

For buyers with requirements outside the standard 0.8mm or 1mm offerings, or needing adjustments to pitch, airfoil, blade count, or motor matching, Gemfan Hobby provides one-stop OEM/ODM customization services. This covers demand analysis, product design, sample development, and mass production delivery, with design focuses tailored to FPV racing (response speed and impact resistance), cinematic aerial photography (thrust stability and low vibration), and industrial/agricultural drones (power efficiency and reliability under long-term high-load conditions). Material options extend beyond PC to glass fiber reinforced nylon, allowing trade-offs between strength, weight, and cost. The technical team can intervene early in the product lifecycle to assist with power matching, performance verification, and mass production implementation, and supports customized sample shipping and solution demonstration.

How to Source Gemfan Micro Propellers

Buyers seeking micro drone propellers with a 1mm center hole can reach Gemfan Propeller through its official channels, including the official website at www.gemfanhobby.net and the inquiry email Contact@gemfanhobby.com. These channels provide direct access to product specifications, customization inquiries, and sample requests for both the Gemfan 1409-3 and Gemfan 1409-2 product lines.