Photo: Tudor Van Hampton for ENR Deere took the wraps off its 944K hybrid loader this past March at the Conexpo exhibition in Las Vegas. Its research shows that contractors will pay more up front for a fuel-saving machine. + Image Image: Courtesy of Deere & Co. The 944K starts with a 13.5L diesel engine bolted to a pump drive and two AC generators. An inverter box manages power, and four wheel motors provide traction. Brake resistors burn off excess energy as the machine slows down, but some energy is pushed back to the generators to run the hydraulics. Related
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.