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Old 05-28-2002, 07:46 AM   #1
jmeyn
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Default Bibliography

The best reference I've seen is Motorcylce Design and Technology, Gaetano Cocco, Aprilia Press. The section on aerodynamics is simply great, and everything you ever wanted to know about moto design is there. I got my copy through Amazon.
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Old 05-28-2002, 10:05 AM   #2
Hurricane600
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Default Re: The Aerodynamics of the RS3 Cube

IÂ’m surprised that we havenÂ’t seen more radical attempts at streamlining from the world of Moto GP. After all, it is basically prototype racing. I would at least expect to see fully faired in wheels and hind quarters. Apparently, like in Formula 1, there are rules that stipulate that the wheels and ****pit must remain open. Does anyone know if there is any truth to this?
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Old 05-28-2002, 10:37 AM   #3
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Default Re: The Aerodynamics of the RS3 Cube

I believe that, simply put, 50% of the front wheel and 50% of the rear wheel must be visible when viewed from the side. With elimination of this rule, you can quickly envision a fairing that totally encloses the wheels and the rider. A retractable strut (landing gear) can be used to hold the bike upright at a stand-still. After all, if things go according to plan the bike should only use the strut once per race. Aerodynamics and safety should improve with the rider strapped into a cocoon (no more highsides!). Fire suppression and rider egress becomes more important, however.
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Old 05-28-2002, 10:57 AM   #4
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Default Re: The Aerodynamics of the RS3 Cube

Sorry, but the rules also say the rider's legs may not be exposed or impeded. The air flow needs of the intake, cooling and braking systems must be addressed. Full streamlining only works for land speed record bikes and they are incredibly unstable and dangerous.



Being strapped into a cocoon will appeal to few racers I'm afraid. That's a different sport.

Aprilia is addressing what they can do under the rules:

1) Lower the center of pressure and reduce the drag coefficient to control pitch

2) Improve integration of the rider profile with the fairing and seat back

3) Reduce or eliminate front wheel lift

4) Move the center of pressure back (fin?)



They have great engineers!
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Old 05-28-2002, 10:59 AM   #5
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Default Re: The Aerodynamics of the RS3 Cube

Don't forget that riders use their bodies to assist in braking by sitting up before a corner. A fully enclosed rider couldn't stop as effectively and would be susceptible to late braking passes all the time (assuming the unfaired rider could stay close enough).
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Old 05-28-2002, 11:15 AM   #6
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Default Re: The Aerodynamics of the RS3 Cube

You must be joking about being "strapped into a cocoon." Ask yourself if you want to be strapped to your bike when it goes down. Something tells me you won't get a roll cage with your cocoon idea, so its best not to be strapped to the motorcycle.



BTW, the physics of a "highside" will not go away with a cocoon. As long as tires still slide, highsides(and subsequent crashes) can happen.
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Old 05-28-2002, 01:50 PM   #7
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Default Re: Bibliography

I wasn't really all that impressed with Motorcycle Design and Technology. I don't know if the problems are with the original text or the translation (assuming this is a translation) but the book needed a severe technical editing. The technical discussions did not unfold in a logical sequence. When read carefully, some of the equations in the chasis chapters were wrong, when compared to the prose. The discussion of tire slip was beyond understanding. I have BS and Master's degrees in Mechanical Engineering, and have plowed my way through some poorly written text books. This was by far the most poorly written technical book I have every read. If he was trying to write a book to explain the basics of how a bike works to a lay audience, he used too may equations (aside from them being wrong and poorly presented). A motorcycle version of "The Way Things Work" would have been a better approach. If he was trying to write a text book (which he claims he is not) he needs to learn how to write for a technical audience. As is I found this book had very little value to the reader beyond the great cover.
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Old 05-28-2002, 03:19 PM   #8
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Default Re: The Aerodynamics of the RS3 Cube

Please change expose to enclose in my first post.
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Old 05-28-2002, 04:45 PM   #9
Bryan8252
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Default Re: The Aerodynamics of the RS3 Cube

Excuse me, am I missing something here? Isn't a motorcycle supposed to be an open air, freedom inspiring commune with nature, speed and the mind/body/spirit? Presumably, manufacturers race to sell. Do you want to be putting around your neighborhood in a cocoon? We motorcyclists continually deride cars as cages, and the people who drive them less than fondly. Yet, we are writing about cocoons for our heart's delight? Gimmie a "real" motorcycle please--plenty of sound and wind, so I will be certain that I have escaped the clutchs of society for at least a few moments, and that I will be absolutely certain that I'm on a motorcycle. Better to be run over and killed by a socer mom than ride around in a cocoon, or anything remotely resembling a set up like that. Just one person's view.
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Old 05-28-2002, 06:18 PM   #10
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Default Re: the open air

Yes, you're absolutely right about the point of motorcycling in general.



However that's not particularly relevant in the scheme of aerodynamics at the top level of motorcycle road racing. There is one big reason why GP bikes cannot touch F1, prototypes (le Mans), and so on-- aerodynamics. Too much drag for the power they make and no downforce. Without downforce they can't touch the cornering or braking of the elite 4 wheeled vehicles.



-Colin
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