TopXGun FP400 Agricultural Drone Spreading Operation Parameters Recommendation


TopXGun FP400 Agricultural Drone Spreading Operation Parameters Recommendation 2023

TopXGun FP400 Agricultural Drone Spreading Operation Parameters Recommendation 2023

Jul 10, 2023


When it comes to achieving optimal spreading results with the TopXGun FP400 drone spreader, several factors come into play. Understanding and effectively managing these factors are crucial for successful spreading operations. Let's delve into the key factors that can significantly impact the effectiveness of your spreading operations and explore how to optimize them for maximum efficiency and accuracy.

1. Material Characteristics: The characteristics of the spreading material typically include density, shape, viscosity, humidity, etc. Different materials may have significant parameter variations due to these characteristics.

2. Material Calibration: Due to the differences in material characteristics, it is essential to calibrate each type of material according to the requirements before operation to avoid significant dosage errors.

3. Weather Conditions: Operation should be conducted below wind level III to avoid adverse weather conditions such as high temperature and humidity. For seeding operations, it is recommended to operate below wind level II.

4. Operational Parameters: The operational parameters should meet the requirements for spreading width, uniformity, and dosage. After setting the parameters, it is advisable to conduct small-scale tests, especially for seeding operations, to test the spreading width and uniformity.


Parameters for Spreading Operation
Parameter Unit Parameter Definition Instructions Notes
Dosage kg/mu Material used per mu
(1 mu = 0.0666667 ha)
Depends on the type of material A operation height of 5 meters is suggested. For areas with obstacles such as power lines, adjust the height accordingly and adjust the flight line spacing. The displayed roller rotating speed is the maximum speed when setting the parameters, and it varies with flight speed.
Flight Line Spacing m Distance between lines during operation Set the operational spacing between flight lines based on the actual effective spreading width
Flight Speed m/s Maximum speed during operation Speed is related to dosage, line spacing, and roller rotating speed. It is recommended to operate at speeds below 10 m/s.
Flight Height m Horizontal altitude during operation Higher altitude results in a larger spreading width and lower density. It is suggested to operate at the height about 5 meters.
Inner Fan Rotating Speed % Rotating speed of inner fan during operation The fan rotating speed is inversely proportional to density and directly affects the spreading width. Refer to the parameter table for adjustment to achieve better results. After adjusting the fan rotating speed, remember to enable the custom parameter switch for the changes to take effect. Avoid setting the fan speed to maximum to balance the spreading width and uniformity.
Middle Fan Rotating Speed % Rotating speed of middle fan during operation
Outer Fan Rotating Speed % Rotating speed of outer fan during operation
Roller Rotating Speed r/min Maximum rotating speed of feeding roller during operation The rotating speed of the roller changes with the flight speed during operation. The maximum rotating speed is 300 r/min. As the dosage increases, the roller rotating speed also increases. The displayed roller rotating speed in the parameter settings represents the maximum speed, not a constant speed.



Roller Use Instructions
Roller Type Small Roller Dosage < 5kg/mu It is mainly used for small-grained seeds and low-dosage operations, such as rice seeds, rapeseed, and small-grained bait;
Big Roller Dosage ≥ 5kg/mu It is mainly used for large-grain fertilizers and large-dosage operations, such as compound fertilizers, urea, and large-grain bait;


Spreading Operation Parameters
Type Dosage(kg/mu) Flight Speed(m/s) Spread Width(m) Flight Height(m) Roller Type Roller Rotating Speed(r/min) Outer Fan Middle Fan Inner Fan Notes
Small-dosage rice seeds 1.5~3 4.5~5.5 5.5~6 4.5~5.5 Small 60~150 59 63 48

1. For spreading lighter seeds, it is essential to operate below wind level II. Otherwise, it may result in insufficient spreading width. It is strictly prohibited to operate in gusty weather conditions, as it can cause uneven spreading.

2. After soaking the seeds, they should be dried in advance before the spreading operation.

3. For seeding operations, it is necessary to test two flight lines to ensure uniformity and proper spreading width (no missed spots).

3~5 4.5~5.5 5~5.5 4.5~5.5 150~255
Large-dosage rice seeds 5~10 5~6 4.5~5 4.5~5.5 Big 70~140
10~13 5~6 4.5~5 4.5~5.5 140~250
Shrimp and crab feed 1.5~2 7~8 7~7.5 4.5~5.5 Small 90~110 56 63 48

1. There are various types and shapes of feed, and for significantly larger ones that cannot fit in small roller, it can be replaced with larger rollers.

2. The feed uniformity requirements are not as high as for seeds, the speed can be appropriately increased to expand the spreading width when spreading the feeds.

2.5~5 7~8 6~7 4.5~5.5 140~300
Compound fertilizer 3~10 7~8 5~5.5 4.5~5.5 Big 45~105 94 88 85

1. For fertilization, where uniformity requirements are not high, the speed can be increased to expand the spreading width.

2. The rotation speed increases with the increase in dosage, spreading width, and flight speed.

3. For fertilization with large dosage, it is advisable to avoid excessively long flight lines to minimize power waste.

4. For large fields, it's recommended that transport the fertilizer to designated landing points in advance.

5. When applying fertilizer, it is important to crush any lumps to prevent material blockage.

11~17 7~8 4.5~5 4.5~5.5 120~180
18~25 7~8 4.5~5 4.5~5.5 195~270 98 100 94
Urea 3~5 7~8 5.5~6 4.5~5.5 Big 45~60 84 81 78
6~10 7~8 5~5.5 4.5~5.5 70~105
11~25 7~8 4.5~5.5 4.5~5.5 120~270 91 84 78


Precautions for spreading operations

Calibration Operation:

  1. Create a new material profile for new materials.
  2. Ensure that the aircraft is centered and stable during calibration, and do not touch the aircraft during the process.
  3. Use the appropriate roller for calibration; otherwise, the dosage will be inaccurate.
  4. Different rollers for the same material require re-calibration.
  5. It is recommended to calibrate with a full load of material.
  6. If the calibration curve is not smooth, it is advisable to re-calibrate.


  1. Avoid overloading, as the aircraft cannot take off when overloaded.
  2. Check if the firmware and software versions are updated.
  3. If there are many power lines in the field affecting spreading operations, adjust the aircraft's operational height and spreading width accordingly.
  4. Before spreading, especially for seeding operations, it is recommended to test two flight lines to check for uniformity and any missed spots, then confirm the parameters.

Maintenance & Care:

  1. Clean the spreading tank thoroughly after operation.
  2. Connect the battery first before loading materials to prevent corrosion on the distribution board and battery connectors.
  3. Ensure that the connections of the spreading and spraying lines should avoid water short circuits.


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