| [ Total Views: 1466 | Total Replies: 37 | Thread Id: 68355 ] |
| Pages: 1 2 |
|
|
 bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
The international telephone dialing code for Antarctica is 672.
Posts: 6661
Threads: 534
Registered: April 8th, 2005
Member Is Offline
Location: Tanah Merah, SE-QLD
Theme: UltimaBB Pro Blue ( Default )
Mood: A bee bit ma' bottom, now ma' bottom's big!
|
| posted on April 4th, 2008 at 10:11 PM |
|
|
| Quote: | Originally
posted by Pastit
They say that people who "Intelchooilize" things are making up for inadequies in the "Bedroom flute" department. Any truth?
|
hahaha
no comment 
yea, its a waste of time, but in the end, this is all locked in my mind now. ready for the uni physics quiz next week
uni sux
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
|
|
Pastit
Seriously Crusin Dubber
Posts: 150
Threads: 16
Registered: February 9th, 2008
Member Is Offline
Location: Bush
Theme: UltimaBB Pro Blue ( Default )
|
| posted on April 5th, 2008 at 07:31 AM |
|
|
| Quote: | Originally
posted by bajachris88
hahaha
no comment
yea, its a waste of time, but in the end, this is all locked in my mind now. ready for the uni physics quiz next week
uni sux
|
You have a choice, go and cook burgers or maybe get one of those flashy dayglow vests and retrieve runaway shopping
trolleys.........................or you could go to Uni, I think you've made the right one.
Going back to your other problem, there is help. The IMHSA (International Mens Half Size Association) is an association formed for the networking and
fellowship of men with undersize genitals. I'm sure your Uni will have a local chapter or you could be like me and form your own. You will be
surprised how many people you know who are so inflicted, our previous PM (That's where the term Lil Johnny came from) was a founding father of the
Australian branch. So go forth and seek help, you need'nt suffer alone.
|
|
|
sinecure
A.k.a.: Sin
Custom Title Time!
Want another... :(
Posts: 1031
Threads: 76
Registered: March 30th, 2006
Member Is Offline
Location: Lat 27 S, Long 153 E
Theme: UltimaBB Psyche Blue
Mood: Low, slow and SAD to see it go.
|
| posted on April 6th, 2008 at 07:16 PM |
|
|
| Quote: | Originally
posted by bajachris88
As for tyre to road friction, despite whether braking mechanisms are working or not, they all only retard the spinning of the wheels, not the car's
velocity. The only thing that slows down the car is the friction between the bitumen and the tyre, otherwise the wheels would consistantly lock up due
to the braking mechanisms and hence the car would keep sliding along the road (if friction was very small)
If the car was rolling to a stop, or braking suddenly, it will always be using the road as its only base for stopping.
|
Thanks mate! I KNEW I'd screwed something up there, just couldn't figure out what 
A POSSE AD ESSE.
I live in my own little world, but it's okay, they know me here.
|
|
|
Baja Wes
Bishop of Volkswagenism
V6 Baja Pioneer
Posts: 3119
Threads: 94
Registered: August 26th, 2002
Member Is Offline
Location: Brisbane
Theme: UltimaBB Pro Blue ( Default )
Mood: Content
|
| posted on April 9th, 2008 at 05:30 PM |
|
|
| Quote: | What if i told ya
that the stopping ability of your car never increases with wider tyres, nor with extra weight above?
....
Function 2: f = u x n (f, being the friction force. I couldn't find the funky u symbol for the coefficient of friction, however thats what the u
stands for.
|
Unfortunately your statement and the title of this thread is incorrect.
The friction function shown is an approximation and the fraction values used in it are empirical.
To calculate the friction more accurately takes into account a whole lot more variables that simply aren't in the simplified equation. These more
complex variables include contact patch area and pressure. This is because you start having molecular adhesion and deformation of the tyre itself. The
simple equation is the most correct for hard on hard sliding surfaces.
The tire companies keep the more complicated equations secret as they use them for racing where they compete against each other.
Widers tyres have more grip, and lower tyre pressures increase the tyre contact patch also giving more grip. But there is a limit to both of those
too. If you inflate your tyres to 50psi you'll notice your contact patch will be very small and you won't get much grip. But this same tyre with the
same rubber compound will have more grip at 30psi with the larger contact patch.
If you want to see how complicated the tyre friction can get have a look at this;
http://hal.inria.fr/docs/00/05/14/75/PDF/vsd05.pdf
or just google "Pacejka's magic formula"
|
|
|
Volkswagenboy
A.k.a.: Brenton Barry
Veteran Volks Folk
Staggers Automotive.
Posts: 2437
Threads: 92
Registered: July 28th, 2005
Member Is Offline
Location: Boronia Heights, Brisbane.
Theme: UltimaBB Pro Blue ( Default )
Mood: Indifferent
|
| posted on April 9th, 2008 at 08:19 PM |
|
|
| Quote: | Originally
posted by bajachris88Its a good topic, we need baja wes in here as well.
|
Ah there he is!!!
-Staggers.
STAGGERS AUTOMOTIVE - Heavy Vehicle Diesel Specialist
JB CUSTOMS & CLASSICS - Car Builders
2/53 Tradelink Drive, Browns Plains |
|
|
Baja Wes
Bishop of Volkswagenism
V6 Baja Pioneer
Posts: 3119
Threads: 94
Registered: August 26th, 2002
Member Is Offline
Location: Brisbane
Theme: UltimaBB Pro Blue ( Default )
Mood: Content
|
| posted on April 9th, 2008 at 09:26 PM |
|
|
Better late than never hey 
|
|
|
camando
Commited Dubber
Posts: 52
Threads: 8
Registered: June 28th, 2006
Member Is Offline
Location: Fitzroy Melbourne
Theme: UltimaBB Pro Blue ( Default )
|
| posted on April 10th, 2008 at 12:04 PM |
|
|
Great topic.
But you forgot Static friction.
Static friction is the coeffiecient between two surfaces not moving in relation to each other.
This coeffiecient is greater than Kinetic friction (slip).
Depending where you look up to ~0.8 for wide soft tyres on a good road.
Down to ~0.4 for Kinetic friction
This is why ABS stops you quicker than locking up.
Or burnouts get you no where.
Static friction is more closely related to contact area as the electric charge between the molecules from the different surfaces can create a better
bond.
Hence why F1 went for grooved tyres to reduce grip (speed).
|
|
|
Volkswagenboy
A.k.a.: Brenton Barry
Veteran Volks Folk
Staggers Automotive.
Posts: 2437
Threads: 92
Registered: July 28th, 2005
Member Is Offline
Location: Boronia Heights, Brisbane.
Theme: UltimaBB Pro Blue ( Default )
Mood: Indifferent
|
| posted on April 12th, 2008 at 04:29 PM |
|
|
| Quote: | Originally
posted by Baja Wes
Better late than never hey
|
Yep!!!
-Staggers.
STAGGERS AUTOMOTIVE - Heavy Vehicle Diesel Specialist
JB CUSTOMS & CLASSICS - Car Builders
2/53 Tradelink Drive, Browns Plains |
|
|
| Pages: 1 2 |
