Fun time with a Suzuki 1300R (Hayabusa) last night....

[R_Ethug]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

they do provide excellent rear downforce without a spoiler tho.. mk4 jetta and my b5's ass get dirty as hell after driving a week

[VRado6]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

I wouldn't exactly call anything made by VW/Audi, (Corrado & R8 aside) aerodynamic. A 3 year old designed these cars. They have the aerodynamic properties of a shopping cart.

I'm thinking you should maybe do a little research before you say things like this. After a little bit of searching, I was able to rangle up some numbers. A Hayabusa has a CD of approx 0.56, so feel free to compare these numbers. The lower the number, the better.

Drag Coefficient numbers:

Normal everyday VAG products...

VW MK4 - 0.34
VW MK5 - 0.32
VW B5 - 0.27
Audi B5 - 0.28

Exotics

997 Turbo - 0.31
F430 - 0.33
Audi R8 - 0.35


It would seem that looks are deceiving. Aerodynamics of a shopping cart indeed

[Canadian Turbo]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

Are those bike CD numbers with or without a rider as I am sure that would greatly change the number to, especially with larger individuals.

[The_Jerbel]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

I'm thinking you should maybe do a little research before you say things like this. After a little bit of searching, I was able to rangle up some numbers. A Hayabusa has a CD of approx 0.56, so feel free to compare these numbers. The lower the number, the better.

Drag Coefficient numbers:

Normal everyday VAG products...

VW MK4 - 0.34
VW MK5 - 0.32
VW B5 - 0.27
Audi B5 - 0.28

Exotics

997 Turbo - 0.31
F430 - 0.33
Audi R8 - 0.35


It would seem that looks are deceiving. Aerodynamics of a shopping cart indeed

Good call man. That is something that many of us knew in real world terms, but this is the first time I've seen numbers representing the actual drag. Thanks!

[Boy Racer]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

Dont forget that coef is only part of the equation.. frontal area is there too... just provoking this a bit more

[The Brice]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

Dont forget that coef is only part of the equation.. frontal area is there too... just provoking this a bit more

I thought the frontal area of an object was part of the equasion in figuring out the drag coefficient no?

[R_Ethug]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

I LOVE LAMP!

[Boy Racer]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

http://www.f1-country.com/f1-enginee...odynamics.html

F = 0.5CdAV2,

whereF - Aerodynamic drag

Cd- Coefficient of drag

D- Air density

A- Frontal area

V- Object velocity

[The Brice]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

http://www.f1-country.com/f1-enginee...odynamics.html

F = 0.5CdAV2,

whereF - Aerodynamic drag

Cd- Coefficient of drag

D- Air density

A- Frontal area

V- Object velocity

Interesting, I have very little knowledge on the subject but I'm trying to get a better grasp on it. So the formula you posted is to figure out a vehicles total aerodynamic drag at speed correct? While doing a brief search on wiki (I know, not a reliable source) they talk a little about this but they also state how how typ. SUV's for example have a Cd of .35-.45 because of boxy shape and "large frontal area", is this correct or just some wiki B.S. I'm just trying to understand if the frontal area of a vehicle is indeed used in figuring out a vehicles Drag Coefficiency and if so it is then essentially used twice in the formula to figure out a vehicles total aerodynamic drag? HAHA my brain hurts! If anybody can help clear this up a bit for me feel free to clarify, and if I'm just sounding like an idiot don't belittle me too badly.

Cheers

[RONDAL]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

why would it be used twice in the formula?

The coefficient of drag is a variable dependant on the specific car: Cd

*This is what the VRado6 used which is not entirely accurate information to use when determining the aerodynamics

Then you have air density, which should be constant when comparing cars so as to compare apples to apples - D

Then you have Frontal Area, this is the exposed surface that is breaking the air over it as it moves. Pretty self explanitory, this is vehicle specific - A

Object velocity, should again be constant to compare apples to apples. - V


While a ferrari and a jetta may have very similar coefficients of friction, their frontal areas are quite different which will lead to a ferrari having a much lower aerodynamic drag #.

You also must remember many higher end sports cars purposefully create drad in the form of downforce to increase grip.

[Boy Racer]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

Basically, the coefficient can be thought of as a shape dependant thing so scaling would not affect it so the coefficient is independant of the frontal area. A scale model SUV would have the same(ish) coef as a real SUV but when you calculate the total force (or power) needed to push the SUV through the air at a certain speed, the frontal area and speed in the equation come into play. So a ferrari with a higher coef than an MK4 may not require as much force if the frontal area is much lower.

[Boy Racer]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

Rondal beat me to it.. even the ferrari vs. vw eg.

[The Brice]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

Thanks for some clarity on the subject guys, I read and understood the individual components of the the aerodynamic drag formula but BoY Racer as you stated about a scale model having the same(ish) drag coefficient as its full size counterpart then you are stating that frontal area has nothing to do with a vehicles Cd rating correct?, and the writer of the wiki article I read is false in the statement of frontal area being a factor. So if that's true then the bullet shaped body of say a Mclaren having a Cd of .32 and a boxier shaped car (in comparison) like the new GTI also having a Cd of .32 has nothing to do with the Mclarens larger frontal area it has to do more with Mclaren's other aerodynamic features such as wing, spoilers, scoops etc. is this correct? That is why I brought the point up about frontal area being used twice in the formula because of the wiki statement I read about the SUV's lower Cd# being based on it's boxy shape and "large frontal area", so that being said if frontal area is used towards calculating a vehicles Cd then according to the formula the two of the factors used to calculate a vehicles total aerodynamic drag are it's Cd#(using frontal area) and again using the vehicles frontal area as a number towards figuring the vehicles total aerodynamic drag that's all Rondal. Just looking for some clarity.

[RONDAL]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

the wikipedia article is grossely misleading. Will try and find something better at work.

[R_Ethug]

Re: Fun time with a Suzuki 1300R (Hayabusa) last night....

2.7t can neva lose!

game over!