1st Concave dual runner snowmobile ski

Arctic Cat made the original concave dual runner skis in 1963 without patenting it. That means anyone can make a concave dual runner ski. To get a patent you have to bring something new and unique to the table!

Those skilled in the art know the "Laws of Physics" only work one way. Any snowmobile ski that has triangular pocket running lengthwise and is the same width, on the bottom, will function similar as long as they are attached the same way. The distinctions made them look different but they would function similarly. As the "Laws of Physics" dictate similar profiles follow similar ruts. Not only does the Simmons ski dart following other Simmons skis they also dart when following Ski Doo's Precision skis. Darting occurs when the skis are grabbed in an unsafe manner by the ruts left by other similar instead of 15". A shorter host bar requires less effort to turn the handlebars, however the loss of resistance allows the sleds to push in the corners. The first plastic "flexing ski" came on the Chrysler, Snow Runner in 1980. It had a keel near the outside edges and one down the center. The three keels create their own path. The front of the ski had no loop and functioned similarly to the Simmons sliding front loop. Simmons beefed up their original ski design at least three times making it more ridged each time, indicating flex was not really that important.

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