John
Motorcycle Rules General requirements 2-O prohibit taping the forks to a
spoiler shape. This was to prevent duct taping spoilers on the forks which
could blow off and be a hazard. I don't know if the intent of the rule was
to prohibit streamlining of the front forks. Need to ask Dale Martin.
Jim
----- Original Message -----
From: "john robinson" <john@engr.wisc.edu>
To: <land-speed@autox.team.net>
Sent: Monday, February 12, 2001 9:37 AM
Subject: MC aerodynamics
> Howdy,
> As I look at pictures of bikes that are racing at Bonneville Salt Flats,
> (and any road race bike in the last 30 years or so), I notice all bikes do
> not have any aero fairing on the lower fork legs; as this is a known
> smoother of air, by making the rear of any round tube pointed, how come no
> one is modifying the lower legs for more speed? It can't be because it's
> too hard to do, some of the work I've seen done is incredible....why? Is
it
> that the pattern of air that is flowing around the front forward edge of
> the tire and the disruption of air by the spokes that causes the aero
> advantage to be negated? somebody try it before and it didn't work, too
> much unsprung weight? anybody seen any wind tunnel data that I could read?
> For straight line speed, as at the Salt, how come no one has made the back
> of the front fender more fair the same way, with a pointed tail section?
> How about gathering the air, as most bikes do now, at the front of the
> engine, direct it in a closed tube through the bike and vent it via
> converging diverging vents aimed at the hole in the air above and behind
> the rider? Bikes punch a fairly dirty hole in the air, any cleaning up
> results in more speed, doesn't it? anybody got books that I can go to for
> bike aerodynamics? or is it a black art, secrets for the manufacturers
only?
.
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