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| So, we are trying to run this here vintage motorcycle along the ground at a terminal velocity that is faster than the existing record. We have chosen a class that allows partial streamlining and special construction framework.
The special construction frame was a choice that I made that will pay dividends in the smooth delivery of the displaced air back to static. I stretched the wheelbase by 10 inches so we could provide a less abrupt departure of the air off our back (room to lay the rider down and flatten his back). The stock length of a motorcycle is way too short to "manage" the air rushing into the low pressure "pocket" left behind it and so has very poor drag resistance. The high pressure air as it collapses into the low pressure pocket creates a force that is counter to the direction of travel (drag force). You can quickly see that the height, width, and length of our bike must be optimized to suit our needs. You just can't get the package narrow and low enough to effectively reduce drag within a 57 inch (approx. stock) wheelbase. Ok so we are taking a look at the package that we have built so far and we can see that we have some fabrication in fiberglass and perhaps aluminum to do. First I'd like to start at the front. We will need an effective fender/fairing to partialy enclose the front wheel and direct air to where we need it, the cylinder head and the exhaust header. I plan on trapping some air in between the fender top and the bottom of the Dunstall fairing. I'm have a little trickery in mind here. I'll be extending some "splitters" up in front of each fork leg to provide some seperation between the air passing around the bike and cleanly forcing air at our heat sensitive areas. So try to envision a "U" shape across the top of the fender when viewed from the front. Next we will need to close the gap between the trailing edge of the front wheel and the engine fairing. If you look at the "off the shelf" fairing lowers that we have installed, you can see we will need to do some adding to and clever sculpting to achieve this. I hope to provide some photos as we are reshaping this area and help bring everyone along as we develop the shape. Meager beginings....Special construction frame. More to follow. |