The new ones are turbo-props and I understand they're totally controlled by GPS. The pilot enters the coordinates and other data on the field before he takes off and GPS takes it from there. Locates the field, controls the step for each pass, etc. I believe GPS even turns the spray on and off at the ends of the field. All the pilot has to do is fly the plane and follow the GPS instructions.
I found this out when I was doing insurance inspections. I inspected an aerial spray business. While I was doing my job, a pilot started the engine on a plane and while it was warming up sat in the cockpit for about 10 or 15 minutes with what looked like a laptop computer, so I asked questions.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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