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Andreas Stihl designed and hand built his first chainsaw in 1926. [5] The saw was electrically powered, and weighed about 48 kg (106 lb). [6] Stihl grew slowly initially, as the chainsaws came to the market about the same time as the Great Depression; with manpower cheap, and old two-man saws proven, there was no need for power saws.
The chain has to be properly matched to the guide bar and the saw. Chainsaw manufacturers specify a selection of suitable chains for each model of saw. Best safety requires that the chain is properly sharpened. One key sharpening parameter is the depth gauge setting. The depth gauge is the small steel protubera
The early models were heavy, two-person devices with long bars. Often, chainsaws were so heavy that they had wheels like dragsaws. Other outfits used driven lines from a wheeled power unit to drive the cutting bar. [17] After World War II, improvements in aluminum and engine design lightened chainsaws to the point where one person could carry them.
For a four-stroke engine, key parts of the engine include the crankshaft (purple), connecting rod (orange), one or more camshafts (red and blue), and valves. For a two-stroke engine, there may simply be an exhaust outlet and fuel inlet instead of a valve system.
Several Soviet and Russian rocket engines use the approach of clustering small combustion chambers around a single turbine and pump. During the early 1950s, many Soviet engine designers, including Valentin P. Glushko, faced problems of combustion instability while designing bigger thrust chambers. At that time, they solved the problem by using ...
The British Rail Class 171 Turbostar is a type of diesel-hydraulic multiple unit passenger train built by Bombardier Transportation at Derby Litchurch Lane Works in England. It is identical to the Class 170 , except for the replacement of the BSI coupler with a Dellner coupler.
1961 model year with shorter landing gear, engine mounts lengthened by three inches (76 mm), a reshaped cowling, a pointed propeller spinner, and an increased gross weight of 2,250 lb (1,021 kg). The stepped firewall introduced in the closely related Cessna 175 was adopted in the 172, along with the 175's wider, rearranged instrument panel ...
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