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Have an interesting ER story? If I use it, I'll give you a free book. For more Q & A, see my Test your knowledge of ER terms by solving my ER crossword puzzle that was featured in the Prudential Securities Healthcare Group 2002 calendar. Or take the ER-MCAT to see if you have what it takes to be an ER physician. Including my:
Amy reviews ER computer games |
Bumpy snowmobile trails are a fact of life for many snowmobilers. Why are bumps so objectionable?
Snowmobile manufacturers have attempted to isolate the rider from bumps by offering long-travel suspensions and thicker seats. These measures have helped, but ride quality is still far from perfect. Why is this true?
The Smart Seat substantially improves ride quality by offering 5.8 inches of vertical travel. While seats typically have about 8 inches of foam rubber, it is impossible to fully compress the seat to achieve that ROM. In fact, your vertebrae will fracture long before full compression is achieved. Therefore, in terms of ROM, seats may as well just be small springs sitting on top of bricks. While it's true that a certain amount of padding is necessary to distribute body weight, this can be accomplished by using a few inches of foam rubber. Thus, most of the vertical space taken up by standard seat cushioning material is wasted. In contrast, the Smart Seat permits almost 6 inches of vertical motion because it is designed to almost fully collapse so that the maximum ROM is achieved. The Smart Seat consists of three main components: (1) a support plate (which is not required if the seat itself is sufficiently sturdy) made of aluminum plate, (2) curved Smart Springs molded from polycarbonate (Lexan®), and (3) hinges that attach the bottom of the springs to the tunnel. Lexan® is an incredibly tough plastic that is used in a number of applications such as shatterproof windows and bulletproof windows and barriers. The standard Smart Seat is designed to respond to both up bumps and down bumps. When the rider sits on the seat, the springs compress about halfway (slightly above the position shown in the above photograph on the right). From that mid-position the springs can either further compress in response to an up bump or further expand in response to a down bump. The effect of this is that the Smart Seat offers a much smoother ride by effectively filling in the down bump depressions and clipping the up bump elevations as shown in the adjacent diagram. Can the Smart Seat be customized? Yes!
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