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In 1970, Kyoritsu claimed to have 'revolutionized' outdoor cleaning with the PB-9, a backpack power blower. The Echo brand of hand-held petrol powered tools including chainsaws, brushcutters, hedge trimmers and leaf blowers are manufactured in Yokosuka and Morioka, with other major plants in Shenzhen, China and Lake Zurich, Illinois. [5]
A leaf blower, commonly known as a blower, is a device that propels air out of a nozzle to move debris such as leaves and grass cuttings. Leaf blowers are powered by electric or gasoline motors . Gasoline models have traditionally been two-stroke engines , but four-stroke engines were recently introduced to partially address air pollution concerns.
Scavenging is the process of replacing the exhaust gas in a cylinder of an internal combustion engine with the fresh air–fuel mixture (or fresh air, in the case of direct-injection engines) for the next cycle. If scavenging is incomplete, the remaining exhaust gases can cause improper combustion for the next cycle, leading to reduced power ...
One of the unique features of the 149 engine is its bore and stroke 5.75-by-5.75-inch (146 mm × 146 mm); hence, it is known as a square bore design. It has a relatively high power-to-weight ratio . The 20V149 TIB DDEC III SCCC in stand-by generator spec has an output of 2,936 hp (2,189 kW) from a capacity of 2,980 cu in (48.8 L).
The turbocharger was the then-new EMD mechanically assisted turbo-compressor. During engine startup, and at lower power levels, during which there is not sufficient exhaust heat energy to drive the turbine fast enough for the compressor to supply the air necessary for combustion, the engine drives the compressor through a gear train and a freewheel.
[3] [2] Sutherland took up surplus boards and memory to build a home computer, ECHO IV (the "IV" in ECHO IV came from the PRODAC IV). It was made public for the first time in 1966. [4] [2] The computer was working in the Sutherland's house until 1976, and was donated to the Computer Museum in Boston in 1984. [2] [5] [6]
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