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The project focused on developing a 10–11 inch FPV quadcopter for high-speed flight, long-range operation and equipment-carrying applications. Compared with smaller FPV drones, a 10–11 inch platform can accommodate larger batteries and additional equipment, but the increase in overall aircraft weight also requires a propulsion system with significantly greater thrust and torque.
The customer needed a motor that could drive larger-diameter propellers while maintaining responsive throttle control. The propulsion system also needed enough thrust reserve to support rapid acceleration, climbing, high-speed flight and recovery from aggressive maneuvers.
Based on these requirements, BGS selected the F3115 external rotor BLDC motor. The motor uses a 12N14P configuration, a 5mm shaft, approximately 37.2 × 32.8mm motor dimensions, and weighs approximately 112g including the cable. The motor is designed around a 6S LiPo platform, while different KV configurations allow the propulsion system to be optimized for different propeller sizes and flight requirements.
For a 10-inch platform, the F3115 can be matched with propellers such as HQ9×5×3 or HQ10×5×3, while the 1050KV configuration can also be tested with an HQ10×4.5×3 propeller. This gives engineers greater flexibility when balancing thrust, efficiency and current consumption.
The application target can therefore be summarized as a 10–11 inch FPV propulsion system requiring more thrust than conventional compact FPV motors while retaining a relatively lightweight and compact motor structure.
The main engineering challenge was to increase propulsion performance without allowing motor weight, current consumption or thermal load to grow excessively.
A 10–11 inch FPV drone is typically heavier than a conventional racing platform because it carries larger batteries, longer-range communication equipment, cameras or other payload components. The motor must therefore provide sufficient thrust not only for hovering, but also for acceleration and high-load flight.
For the F3115, BGS testing demonstrates substantial thrust capability under 6S operation. With 900KV + HQ10×5×3 + 6S, the motor produced approximately 4,635g maximum thrust, while the 1050KV + HQ10×4.5×3 + 6S configuration reached approximately 4,810g under the published test conditions.
These figures provide a significant thrust reserve for 10-inch-class platforms, although the actual usable aircraft payload must always be calculated according to the total aircraft weight, flight altitude, battery condition, propeller and required safety margin.
A 10–11 inch drone needs larger propellers to generate efficient thrust, but larger propellers also create greater aerodynamic load on the motor. A motor optimized only for high RPM may not provide the required torque efficiently.
The F3115's external rotor structure and 12N14P configuration are designed to provide strong torque output for larger propellers. The outer rotor increases the effective rotational radius, allowing the motor to generate the torque required to drive larger propellers while maintaining a compact overall structure.
High-throttle operation can push current significantly higher, especially when larger propellers are used. In the published test data, the 900KV version reaches 83.1A with an HQ10×5×3 propeller at full throttle, while the 1050KV version reaches 83.8A with an HQ10×4.5×3 propeller.
This means the propulsion system cannot be designed around the motor alone. The ESC, battery, wiring and cooling conditions must all be selected according to the expected operating current.
For this reason, thermal stability became an important part of the propulsion-system design rather than simply pursuing maximum peak thrust.
To address these challenges, BGS developed the propulsion solution around the F3115 external rotor motor + 6S battery + large-diameter FPV propeller combination, with the final KV and propeller selected according to the aircraft's weight and flight requirements.
For a 10-inch FPV platform prioritizing a balance between thrust and efficiency, the 900KV configuration provides a strong starting point. BGS testing with 900KV + HQ9×5×3 + 6S produced approximately 4,215g maximum thrust, while the larger HQ10×5×3 propeller increased the maximum thrust to approximately 4,635g. At 60% throttle with the HQ10×5×3 propeller, the motor generated approximately 2,195g thrust at 23.2A and 556.8W, with a measured efficiency of approximately 3.94g/W.
For applications requiring stronger high-speed response, the 1050KV configuration provides another option. With an HQ10×4.5×3 propeller and 6S battery, BGS testing recorded approximately 4,810g maximum thrust, with approximately 2,250g thrust at 60% throttle and 3,580g at 80% throttle under the published test conditions.
This gives the F3115 a useful operating range for different 10–11 inch FPV configurations. A 900KV setup can be considered when the priority is smoother power delivery and efficient operation with a larger propeller, while 1050KV can be considered when stronger acceleration and higher-speed response are more important.
The motor's physical design also supports this application. The F3115 weighs approximately 112g including cable, uses a 5mm shaft and M5×14.5mm propeller adapter, and adopts a Φ19-M3-4 mounting pattern. Its dynamic balancing specification is ≤5mg, helping reduce unwanted vibration during high-speed rotation.
The motor also uses 200°C-grade copper wire, while the manufacturer specifies a service life of more than 1,000 hours. These characteristics provide a suitable foundation for FPV platforms that require repeated high-load operation rather than only short bursts of maximum output.
For an 11-inch platform, the final propulsion configuration should be further validated according to the exact propeller diameter and pitch, total aircraft weight and battery voltage. BGS can adjust the motor's KV, winding and other performance parameters when a standard configuration does not meet the customer's requirements.
The resulting F3115 solution is particularly suitable for 10-inch FPV racing and freestyle drones, long-range FPV platforms, high-speed aerial photography drones, inspection UAVs and medium-payload multirotor platforms. The product page also identifies industrial drones, agricultural UAVs, mapping platforms and medium-payload UAVs as relevant application areas.
For a 10–11 inch FPV project, supplying the motor is only one part of the propulsion-development process. The final flight performance depends on how the motor interacts with the propeller, ESC, battery, frame and flight controller.
BGS therefore provides technical support throughout the integration and testing process.
Before production, engineers can evaluate the customer's aircraft weight, target payload, propeller size, battery voltage, expected flight time and required thrust and recommend an appropriate F3115 KV configuration. This helps customers avoid common problems such as selecting an excessively high KV motor, using an unsuitable propeller or exceeding the ESC and battery current capacity.
During prototype testing, BGS can also help analyze insufficient thrust, excessive current, motor overheating, abnormal vibration, bearing noise and unstable throttle response. If the customer provides flight-test data such as battery voltage, current, RPM, thrust and motor temperature, BGS can further assist with propulsion-system optimization.
For customers developing their own 10–11 inch UAV platform, BGS can also provide OEM and ODM customization, including motor dimensions and performance parameters. The manufacturer states that it supports customized motor solutions, rapid technical response, fast delivery and a one-year quality assurance service.
This service model allows BGS to support the project beyond the initial motor purchase, covering the complete process from motor selection and propeller matching to prototype testing, performance optimization and mass production.
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