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March/April 2024 | Muedanyi Ramantswana

Monitoring and Spraying with the DJI AGRAS T40

Stand Tending


Remotely Piloted Aircraft System (RPAS) technology is improving at a rapid rate. Components such as carrying capacity (payload), battery life, and vision systems are continuously being improved to meet the growing needs across various industries, such as agriculture and forestry. Conventional spraying and monitoring work, which is executed using labour, tractors with implements, and purpose-built equipment, can be performed by aerial tools such as drones. Drones can be used to efficiently spray herbicides or pesticides, spread fertilizer, conduct stand data collection (e.g., monitoring crop health), and for mapping the stands. With the operation of any remotely piloted aircraft system, the user needs to adhere to stipulated legislation, and the operator must be duly trained.

How does the AGRAS T40 work?
According to the manufacturer the AGRAS T40 is equipped with the revolutionary dual coaxial rotor design, allowing it to carry a 40 kg spray load and a 50 kg (70 l) dispersion load. The aircraft has a dual-atomized spray system, DJI Terra, active phased array radar, and binocular vision. It supports multiple missions, from surveying, mapping, to spraying and spreading, to facilitate precision in industries like forestry. The AGRAS T40 combines mapping, spraying, and scattering functions, while its UHD camera and adjustable gimbal allow for capturing the desired images. Images of forest stands can be captured in real time, and local maps can be generated using remote control with the D-RTK 2 mobile station. Furthermore, the system automatically detects terrain boundaries and obstacles for faster route planning. Flight over mountainous and undulating terrain conditions is possible when using this aircraft. The AGRAS T40 comes with a remote control to facilitate accurate mapping. The 8-core processor makes it possible to map 6.67 hectares in 10 minutes. Wasted trips can be minimized with intelligent route planning to improve overall efficiency. The 7-in screen with high brightness offers a wide view with refined details and good visibility. Furthermore, a wide range of custom physical buttons offer flexible control.

Charging the AGRAS T40
Ultra-fast charging is possible by using the 12,000W multifunctional inverter generator with new EFI technology. The charging station produces 1,500W AC output, enough to power the remote control, water pump, charger, lights and other components. The 30,000 mAh intelligent flight battery, with its standard air-cooled heatsink, can also cool down quickly.

Technology improvements
Below is a comparison between the T40 and the T30

Source: PACSys (2024)

Some of the new features include:
• Added obstacle bypassing function;
• Optimized altitude stabilization function of the radar and UI display;
• Updated GEO zone restriction to meet regulations;
• Optimized RTK Settings display;
• Optimized weight sensor detection stability to fix the rare issue of abnormal weighing value;
• Optimized the data storage for Mapping operations to reduce the space occupied in the remote controller storage;
• Optimized hint for flight record auto sync;



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