Key points for selecting the size of the rotor blades of a four-axis unmanned aerial vehicle
When choosing the size of the rotor blades for a four-axis unmanned aerial vehicle (UAV), the purpose of the UAV, performance requirements, and the compatibility between the motor and the frame need to be taken into consideration. The following are the key points for choosing the blade size of a four-axis unmanned aerial vehicle:
First, understand the representation method of blade size
The size of the blades of a quadcopter drone is usually represented by four-digit numbers, such as "1045". Among them, the first two digits represent the diameter of the blade, with the unit being inches (1 inch =25.4 millimeters); The last two digits represent the pitch of the blade, that is, the straight-line distance (theoretical value) moved on the blade plane when the blade rotates one full circle. For example, "1045" indicates that the blade diameter is 10 inches and the pitch is 4.5 inches.
Second, select the blade size based on the purpose of the unmanned aerial vehicle
Aerial photography drone
Aerial photography drones require stable flight and a relatively long endurance. Larger blades can provide greater lift, but they will also increase the burden and energy consumption of the motor. Therefore, aerial photography drones usually choose blades with diameters ranging from 8 inches to 12 inches, and the specific size depends on the weight of the drone, the performance of the motor and the capacity of the battery.
Racing drone
Racing drones pursue high-speed flight and flexible maneuverability. Smaller blades can reduce the weight of the unmanned aerial vehicle and improve the response speed, but they will also sacrifice some lift. Therefore, racing drones usually choose blades with diameters ranging from 5 inches to 8 inches, and the specific size depends on the weight of the drone, the performance of the motor and the flight speed.
FPV
Drones need to fly in narrow Spaces, so they are required to have extremely high maneuverability and flexibility. Fenders typically use blades with diameters ranging from 2.5 inches to 5 inches. These blades can provide sufficient lift while maintaining the lightness and flexibility of the drone.
Third, consider the compatibility between the motor and the blades
Motor KV value:
The KV value of a motor indicates its idling speed per volt of voltage. The higher the KV value is, the faster the motor speed will be, but the smaller the torque will be. The lower the KV value is, the slower the motor speed will be, but the greater the torque will be. Therefore, when choosing the blade size, the KV value of the motor needs to be taken into consideration. Generally speaking, motors with high KV values are suitable for being paired with small-sized blades to achieve high-speed flight. Motors with low KV values are suitable for pairing with large-sized blades to provide greater lift.
Motor current and power:
The size of the blades also affects the current and power consumption of the motor. Large-sized blades require greater force to drive, thus increasing the current and power consumption of the motor. When choosing the blade size, it is necessary to ensure that the current and power of the motor are within an acceptable range to avoid motor overheating or damage.
Fourth, consider the limitations of the rack
Wheelbase:
The wheelbase of the frame determines the maximum diameter of the blades that can be installed on the unmanned aerial vehicle. If the diameter of the blades is too large, they may collide with the frame or other components. Therefore, when choosing the blade size, it is necessary to ensure that the blade diameter is smaller than the wheelbase of the frame.
Motor installation position:
The installation position of the motor will also affect the selection of the blades. If the motor is installed close to the edge of the frame, smaller-sized blades need to be selected to avoid collision.
Fifth, actual testing and adjustment
After determining the blade size, it is recommended to conduct actual flight tests to evaluate the performance and stability of the unmanned aerial vehicle. If any abnormality or poor performance of the drone is found during flight, you can try adjusting the size or shape of the blades to optimize the performance.
Summary
When choosing the size of the rotor blades for a four-axis unmanned aerial vehicle (UAV), factors such as the UAV's application, performance requirements, and the compatibility between the motor and the frame need to be comprehensively considered. Through reasonable selection and combination, the best performance of unmanned aerial vehicles can be achieved.
