Danger comes from the fact that centrifugal force does not increase in direct proportion to an increase in speed, but instead it increases as the square of that speed increase. When rotational speed doubles, centrifugal force quadruples. This effect means that relatively small changes in speed can produce significant increases in force. In the example mentioned, changing from 6,600 rpm to 7,700 rpm multiplies the speed by 1.167. However, the corresponding centrifugal force would multiply by a factor of 1.167 x 1.167, or 1.36. To take a more extreme example, consider the same wheel with a maximum safe operating speed of 6,600 rpm run on a 5-inch right angle grinder at 10,000 rpm. This represents an over-speed of about 1.5 times the wheel''s designed speed. But the corresponding centrifugal force-and the corresponding rotational stress on the wheel-would be about 2.3 times as much as the maximum newolddrillpress allowed.

* Improved vehicle aerodynamics have decreased wind resistance and made the vehicles more "slippery."* Down-sized newolddrillpress engines have reduced engine braking by compression.* Higher speed rear newolddrillpress axle ratios have reduced mechanical retardation.* Radial tires have reduced rolling resistance.* The movement toward smaller wheels and low profile tires require the smaller brake to absorb the same amount of energy as the standard 16-1/2 x 7-in, brake of today.It is no wonder that brake specifications have assumed such a predominate role when purchasing equipment. Fortunately, for truck fleets and the motoring public alike, government is playing a major role in demanding certain brake performance standards on new vehicles.How do all of these government standards help the truck fleet manager when specifying air brake systems? Actually, the standards assume the major responsibilities for proper braking of new vehicles. However, the fleet manager still has certain obligations:

Most serious players in the high-end bracket of today''s ironing market have in their range at least one steam generator, also known as an ironing newolddrillpress system, and with an average price of 134 [pounds sterling], these products should provide dealers with ample opportunity for greater margins than with conventional irons."The introduction of steam generators has had a positive effect on the whole iron market and has great potential," says Caroline Herold, marketing director of Philips DAP."It is still in its infancy and has to mature, but currently growth is five times greater than that of traditional irons and this is very exciting," she enthuses.

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