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CR-39 plastic has an index of refraction of 1.498 and an Abbe number of 58. CR-39 is now a trade-marked product of PPG Industries. [2] An alternative use includes a purified version that is used to measure ionising radiation such as alpha particles and neutrons. Although CR-39 is a type of polycarbonate, it should not be confused with the ...
According to Goodyear and EPA officials "the fuel-efficient line-haul tires deliver up to 4% improved truck fuel economy, and when used with other SmartWay-qualified components, each 18- wheel tractor and trailer used in long-haul can produce savings of up to 4,000 gallons per year, or more than $11,000 annually." [58]
Figure 1 Hard wheel rolling on and deforming a soft surface, resulting in the reaction force R from the surface having a component that opposes the motion. (W is some vertical load on the axle, F is some towing force applied to the axle, r is the wheel radius, and both friction with the ground and friction at the axle are assumed to be negligible and so are not shown.
Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...
A bogie in the UK, or a railroad truck, wheel truck, or simply truck in North America, is a structure underneath a railway vehicle (wagon, coach or locomotive) to which axles (hence, wheels) are attached through bearings. In Indian English, bogie may also refer to an entire railway carriage. [4]
The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin , a 2-or- 3 + 1 ⁄ 2 -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a ...
M246 medium wrecker tractor truck. The M246, with an extra long wheelbase, was a wrecker with a fifth wheel mounted behind the boom. This let the truck perform wrecker duties and to load and tow semi trailers. All had a front and rear winch. Oversize 12.00×20 were used, this was the only model to have this size.
Holt tried to solve the problem by increasing the size and width of the wheels, but this also made the tractors increasingly complex, expensive, and difficult to maintain. One tractor had wheels 7.5 feet (2.3 m) tall and 6 feet (1.8 m) wide, producing a tractor 46 feet (14 m) wide.