Order Carbon Fiber Disc

[Chang]

Hi guys..

We have contacted Composite company(http://www.dacc21.com/) from south korea. So They have decided to make our carbon Fiber Discs and Pad.

So If you want to buy Carbon Fiber discs,I hope to give me email...

Price 1 Disc= about $4000....Little expensive..
But So much Lighter...only 400~600g

[Chang]

Hi guys..

We have contacted Composite company(http://www.dacc21.com/) from south korea. So They have decided to make our carbon Fiber Discs and Pad.

So If you want to buy Carbon Fiber discs,I hope to give me email...

Price 1 Disc= about $4000....Little expensive..
But So much Lighter...only 400~600g

[Mad Ruska]

4x$4000=$16000
$25000-$16000=$9000 for the whole rest of the car. And what is the wigth of a normal Disk 1kg (?), don´t matter. 16000$ save you maybe 1.5 Kg on the car.
Imagen what you can do with $16000 to save wigth. Of course these are unspung and rotating masses.

[ben]

Three words; cost benefit analysis

Also, what's the friction coefficient like? My understanding is that CFRC discs/pads require a lot of heat before they can generate a reasonable friction coefficient. Witness Pirro stuffing the #2 Champion Audi at Le Mans this weekend on cold brakes following a safety car period, and MotoGP teams reverting to steel brakes in the wet.

Ben

[Psychosis]

That is mega big bucks. would have to agree that there wouldnt be much left for the rest of the car and carbon discs start to operate at approx 700C. further, our discs weigh 550g and are laser cut from steel (nice people at http://www.lasered.co.uk), worked out infintely cheaper than $4000 (£2000!!!) a disc! buy 4 and that IS our Entire budget!!

[Cement Legs]

And isnt it true that if you drop one on the ground (pavement or cement, something that hard anyway) that they are no good anymore?

[Chang]

Sorry....
$4000 isn't correct..

only $400....right..

[TG]

Hey Chang,

how did those discs' work out for you at competition? Have you compared the stopping distances with steel rotors?

[VFR750R]

Could you make the discs paper thin so they could get up to temp faster or would they not be strong enough.

[Chang]

Our team used a Carbon Fiber Disc..(Front 2Disc and Rear 1Disc)

First of all, As you know, our car is running about 5 minutes, the temperature of disc was 200~250 degree celcius. It means that coefficient of friction is higher(0.5~0.55) than steel(0.3~0.4). and then The temperature of max. coefficient of friction is 300 degree celcius.

Our specication of disc is diameter 220mm*thickness 5mm. So We're planning to reduce diameter and thickness 2006 Competition

[kwancho]

Have your drivers driven a car with steel rotors? Can they tell the difference?

[B]

Chang

I am very interested with what you have proposed and have checked out the website but id doesn't seem to give much info... where can i find more info regarding the the Carbon Fiber Discs and pads

Regards

Brett
2005 CMT Brake Engineer

[Denny Trimble]

Careful...
http://news.bbc.co.uk/sport2/hi/motorsport/formula_one/4121126.stm

[Mike T.]

Interesting, I wonder if Mika would be complaining if he'd won a GP.

Chang, how did you quantify the differences in coefficient of friction between a steel rotor and a carbon rotor? Just time and temperature info without track info doesn't quite give enoguh to get Cf. As Tim had asked, did you do any back to back testing?

Mike T.
UWFSAE '03-'06

[Chang]

Hi guys..

Our carbon discs was sponsored by DACC. So We're also planning to use the carbon disc at 2006 FSAE competition. But The DACC wouldn't sponsor our team the carbon disc any more.

We decide to buy the disc. So If you interested in the carbon disc, I will wait your answer.

The property of carbon disc(coefficient of friction, temperature) was gived by the DACC company. In addition, The carbon freefoam decide the ability of cabon disc.

We used it at 2005 FSAE competition.
The ability is very good.....

If you interested in the carbon disc..
I will send you the pics.... I need the email address..

[McFly]

Chang,
I am curious about the coefficient of friction throughout the operating temperature. After a lot of testing this last spring with our in house brake dyno, we found that the coefficient for cast iron is constant from ~50 - 500 deg Celsius. I don't see how the carbon disks are going to be much lighter because our front cast iron rotors were about 1.25 lb each (566 grams) and the rears were about 1/2 lb each. The only advantage to the carbon disks that I see is the higher coefficient but that can be made up with a higher line pressure or a larger pad area. I would like to see some pictures though.

[Chang]

As you know...Density of Carbon is 1.75 but Cast iron is 7.95.

and then I know that the difference of desity can affect the coefficient of friction. It means that the carbon disc for fsae differs from F1 carbon disc.