MotoMan

Presents:

Dynamic Aerodynamics

What's Wrong With Eric's Superbike ??
It's another common power problem that won't show up on a dyno.

The 3 factors to achieving speed that are usually considered: 
1) Static (Dyno) Power
2) Ram Air Effect
3) Aerodynamics 

But, if you want to solve this power problem you need to think about what happens when the bike is actually moving. 

After all, motion is what motorcycles are all about, right ?


Static dyno & wind tunnel testing only gives us 
a small picture 
of what's actually happening on the racetrack !!  

At first, the problem's 
not easy to see...
But, once you learn what to look for, 
you'll notice it everywhere !!

My 3 Factors To Achieving Outrageous Speed Are What I Call:
 
1) Dynamic Acceleration,  2) Dynamic Aerodynamics  &  3) Dynamic Horsepower

In other words:
You must always think about the bike.... in motion !!

The Spare Bike

This One's Not Perfect...
o 

The Race Bike

This One's Definitely Bad !
Maybe Wild Billy Was Here  ... ?

Yes, it's hard on the brain & eyes !!

... but, now you can easily see it !!

 The bike on the left's exhaust is pointing exactly straight back, while the bike on the right's exhaust is turned about 10 degrees out to the right !

Although the one on the left is better, it's still not in the best position !!

As you'll remember from the 
"Harley Will Win" article, I showed that one of their problems was that the pipes point the exhaust gasses upwards which ruins the aerodynamics of the bike.

This is an example of
Dynamic Aerodynamics

The Harley's aerodynamic "shape" becomes completely different once the engine is running and the bike is on the racetrack !


Be Sure To Read The 
"Harley Will Win" Article 
At The Bottom Of This Page ! 
It'll Help You To Understand The Kawasaki Problem Better !

There is no diagnostic tool that could have revealed these problems !

That's Why You Have To Use Your Imagination, And...

Remember:
The exhaust should always flow with the teardrop aerodynamic form. 

Otherwise, the Dynamic (actual) Aerodynamics are ruined ! 

The Harley's exhaust gasses are pointing way up. 
The Kawasaki's exhaust gasses are pointing way off to the side.

It's interesting to note that these 2 bikes are often criticized in the motorcycle media as uncompetitive and having "outdated designs. " 

Both need to pay more attention to Dynamic Aerodynamics !

The Hot Set-Up:
This isn't the best photo, but you can see the idea !


Alan "Schmidtastic" Schmidt shows how Your exhaust pipe should look !

As you turn your head to match Schmidtastic's Stunning Lean Angle, you can see that he's mounted his exhaust silencer inwards (clockwise) about 5 degrees from straight up and down. 

That's the optimum position, because it points the exhaust towards the center of the teardrop aerodynamic form.

Whether You Race Or Not:
Improving Your Dynamic Aerodynamics will give you better gas mileage & power on the road and on the racetrack.

Now You've Got The Power !!