Remote-Controlled 900+ Horsepower Caterpillar Bulldozer

During the ninety years until 1970, land-labor ratios increased in all countries, especially after 1950. These increases reflect the rapid declines in agricultural labor forces as people moved to industry and off the land. The United States, however, had an increase in agricultural land as well as a reduction in the agricultural labor force, so that differences in land-labor ratios between it and other countries increased.

Mechanical threshing based on human power, but especially on horses, became widespread in the United States and Britain as early as 1830. By 1850 virtually all grain in the United States was threshed by large mechanical threshers, which went from farm to farm during the winter months. Rental markets were extensive.

What you're looking at here is Caterpillar's massive D11T bulldozer being operated using a remote control joystick.
It outputs over 900 horsepower, and has an operating weight of over 120 tons. Top speed is just 7.3mph going forward and 8.7mph in reverse, but who cares It's a freaking bulldozer that works with remote joysticks.
It's like the world's greatest remote-controlled toy - except it's actually designed for moving huge piles of earth in locations too dangerous for human operators.

Clearly additional investment in research and development is required to render the autonomous power supply options as economic and user-friendly as possible. Also, it should be noted that the purchased electricity supply, although not autonomous, could still be (at least in part) generated from renewable power sources. From a national perspective, renewable alternatives to diesel fuel for mobile equipment (e.g. oilseed fuels) (see also, Energy Sources: Renewable and Non Renewable) may also be considered as autonomous power.

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Position control is a system whereby the position of a fully mounted implement (sprayer or fertilizer distributor, whose weight is completely supported by the tractor) is automatically maintained in a constant position (e.g. operating height over the ground) despite leakages in the hydraulic system tending to lower the position of the implement.

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