5520 x 3643 px | 46,7 x 30,8 cm | 18,4 x 12,1 inches | 300dpi
Data acquisizione:
20 luglio 2017
Ubicazione:
Kansas, United States
Altre informazioni:
Early use of aircraft in agriculture[edit] Crop dusting with insecticides began in the 1920s in the United States. The first widely used agricultural aircraft were converted war-surplus biplanes, such as the De Havilland Tiger Moth and Stearman. After more effective insecticides and fungicides were developed in the 1940s, and aerial topdressing was developed by government research in New Zealand, purpose-built agricultural fixed-wing aircraft became common. Designs[edit] In the US and Europe, agricultural aircraft are typically small, simple, and rugged. Most have spraying systems attached to the trailing edges of their wings, and pumps are usually driven by wind turbines. In places where farms are larger, such as New Zealand, Australia, the former Warsaw pact nations and parts of the developing world, larger and more powerful aircraft have been used, including turboprop powered aircraft such as the PAC Cresco, twin engined types such as the Lockheed Lodestar and the WSK-Mielec M-15 Belphegor - a turbofan-powered biplane. All tend to be of simple, rugged STOL design. Sometimes a Ram air turbine is used as an auxiliary power source for the pumping machinery instead of taking power directly from the engine (because this can be installed without any modifications of the airplane's mechanical systems). In places where dedicated use as an agricultural aircraft is uneconomic, utility types such as the Antonov An-2 biplane and De Havilland Canada DHC-2 Beaver have been used. In the case of helicopters, tanks are placed on or outside the body of the aircraft, while a spray rig, extending outward to the sides, is attached well below the main rotor blades. Hydroseeding is often done by helicopters using tanks and drop systems much like those used for aerial firefighting. Techniques To reduce drift of the sprayed materials, agricultural pilots attempt to fly just above the crops being treated. Fields are often surrounded by obstacles such as trees, telephone lines, etc.
