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Old 07-12-2015, 12:29 AM   #11 (permalink)
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The idea behind the egg shape is that the shape will generate down force instead of lift since the air moving over the smaller radius will have to move faster. Stall strips on the nose help too. Don't take my word for it, ask the Vetter challenge people.

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Old 07-12-2015, 01:54 AM   #12 (permalink)
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I was reading about Alan's results and they are great, he reported no trouble with side lift either .... perhaps they were no 18 wheelers on his course ?
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Old 07-12-2015, 11:34 PM   #13 (permalink)
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See the 1960's Indy cars prior to wings.
http://8w.forix.com/indy/mg-indy63.jpg
While the boxy Chaparral 2J used vacuum power to generate down forcedata:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAkGBxQSEhUUEhQVFBUXFx8UFxcUFRwYGBoXGRoXGBcYFh gdHSggGB0lHBcYITEiJykrLi4uGB80ODMsNygtLisBCgoKDg0O GhAQGy0kICQvLSwtLC4sLCwsLywsLCwsLCwsLCwsLywsLCwsLC wsLCwtLCwsLCwvLCwsLCwsLCwsLP/AABEIAJQBVQMBIgACEQEDEQH/xAAcAAEAAQUBAQAAAAAAAAAAAAAABgEDBAUHAgj/xABPEAACAAQDBAUFCwgIBQUAAAABAgADBBESITEFBkFRBxMiYX EUMoGRoRYjQlJTYpKTwdHSFRdUVWNylLEkMzSCotPh8ENEpLLC ZHN0g4T/xAAaAQEAAwEBAQAAAAAAAAAAAAAAAQIDBAUG/8QALhEAAgECBQIEBgMBAQAAAAAAAAECAxEEEiExURMiFEFhgQV xkbHR8CNCofHB/9oADAMBAAIRAxEAPwDuMIQgBCEIAQhCAEIQgBCPLuACSbAZkmM U7Uk/KJ64AzIRhnakn5RPXFPyrJ+VT6UAZsIxBtOT8onrjLgBCEIAQh CAEIQgBCEIAQhCAEIQgBCEIAQhCAEIQgBCNTvBKdwkuVPaQ74g pCkgkKTY5WFrX1F87d2lkMxxgVpa7gAOGBBBZioIztYgi2oQ3y BsBMIRCVr54KYNo07KQpONBjKtiYGwzN+yAMshrfM5Dzavqx/TJWNgWB6g4cKAYza175N69IAl0IjdJXsJ3bqpXVmzBCcLm8tLA KVGpOL1DnG3O1pANutl3184acM4AzYRhJtaQSQJsu4vcYhcYRi b1A3PdD8rSMvfpeenbHf9xgDNhGM20JQAJmIAdO2M7kgWzzzB9 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Last edited by Grant-53; 07-12-2015 at 11:50 PM..
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Old 07-12-2015, 11:55 PM   #14 (permalink)
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Trash all that after the indy car jpeg! Yikes
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Old 07-13-2015, 02:26 AM   #15 (permalink)
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What is this? Did the quadratic formula explode? I see a "Strong ba" in there, but it's getting eaten... by some... Linux or something. Wait a minute! Is this one of those virus emails?! Like the kind that moms and offshore casinos send you?!? I'll take care of this!
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Old 07-13-2015, 03:03 PM   #16 (permalink)
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We have 18 wheelers everywhere! The California coast riders with Craig Vetter in Monterey get strong winds off the ocean. I get the thunderstorm winds especially crossing the river here. My bicycle fairings have done well because I attach to the head tube rather than the handlebars as do most fairings available. Since a motorcycle has 4 to 4.5 inches of ground clearance, floating plastic skirts could be made. The Chaparral 2J used them to get a partial vacuum under the car for down force. A gas fan would use fuel too.
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Old 07-13-2015, 07:14 PM   #17 (permalink)
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Thanks Grant . I'll have to investigate skirts .
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Old 07-13-2015, 10:10 PM   #18 (permalink)
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A brainstorm (or brain fart) might be to use a pyramid shape as the fuselage of the F-117 aircraft. Being wide at the base and pivoting at the top like a bell and clapper, the motorcycle could tilt inside while the shell is suctioned to the ground with a couple of gas leaf blowers. Good for smooth roads only.
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Old 07-13-2015, 11:19 PM   #19 (permalink)
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Now that is getting way too complicated and I hate leaf blowers !

But the F117 is along the lines of my original brain bubble . Those flat sides and rapid intersections don't look aerodynamic but it works.
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Old 07-15-2015, 03:10 PM   #20 (permalink)
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The issue also arises of engine (and rider) cooling and how much power would be needed to run an electric fan. The tapered side would give some Newtonian down force. The flat sides might be easier to fabricate but I wouldn't count on being invisible to police radar.

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