Inside the wheel well, under the fenders is a high pressure zone when the car is moving foreward. Both front and rear have this issue, a lot of the times in racing and sports cars you see louvers or vents or just an open fender to thwart pressure buildup. It creates lift and in general is...
I have heard only very basic arguments as to why. I want to know what interaction does the tire have on the air stream to cause a high pressure in the fender? Is it really the tires fault or simply the fact that the fender is generaly open and traps air in the fender at a high pressure? How...
Looks like a typical beam axle found on a modern minivan with a watts link.... and if independence is a key benefit then the watts link would give unequal lateral motions side to side in one wheel jounce it seems. Am I seeing this wrong??
So a force that accelerates the body at 3g should be calculated, not the wheel at 3g. This makes much more sense now.
Do you know how the 3-2-1 method compares to modern or even 80's/90's methods? What about road cars?
I have a question regarding the methods used to analyse a frame in the appendix. You are suppose to take a safety factor of 1.5 and then multiply it by 3 to simulate a 3g bump at the wheel. I thought 3g's was very low for the given example of hitting a curb. No damper or spring rates were...
I am not a fan of matrices to be honest, that is just all I have found. I have the book "Racing and Sports car design" by Costin and Phipps, was writen in the early 60's. I haven't opened it in a while. Thanks for the tip. Is the drawing board adn string thing similar to staniforth's "string...
In the 70's and such, what methods were used to calculate suspension geometry in professional racing and passenger cars?
The closest thing I have found was in Race Tech mag. where Peter Elleray supposedly "demystifies" the process. It is pretty clear up intill the middle of all those...
WOW, I was expecting some sort of purpose for it, but what has been given seems like a lack of fore thought. The monster truck stuff seems like a huge megamoniacal show of rediculousness, so I wouldn't be surprised to see something stupid there like 16 shocks supporting a tube frame truck, but...
Come to think of it compactness was another reason Ive seen as you have noted. Seems like a lot of extra cost and weight just to save a little space....
What is the "American method"? The previous Boxer model had this as well FYI. Heres a pic of the jag... http://www.bevenyoung.com.au/hdk3b9ad770.htm
Sometimes this setup is seen with a trailing arm attached to the "I" arm.
The older jaguars and the ferrari testarossa have at each rear corner have two shock and springs, one coil over shock and spring fore and aft of the drive axle. The only explaination I have been given is for the jaguar with the suspension and shocks mounted to a subframe that was very...
If the geometric roll center on a solid front and rear axle car is well above the COG, since there is no jacking force ina solid axle, seems like at first glance it would create a moment that would lean it into the turn. However, without jacking this would mean a compressed inner suspension and...
Lotus elise and exige as well as the Mclaren F1 have only a front sway bar. I know for a fact that the F1 has relativly soft springs and both cars use slightly wide tires in the front based solely on weight distribution, and especially considering the very high power to weight ratio of the F1...
Cibachrome
"Thirdly, The presence of "prime" roadway signal (certain traits of transient aligning moment) can not be understated. A "good" set of tires is not enough with perfect body and steering control components. There are very important traits of a "Great" road feel tire. These factors are...
Oh yeah! The 911 aftermarket guys go a similar direction although not nearly as extreme. Stiff front, soft rear, relatively, sometimes lifts the inner front tire powering out of corners. I would imagine if the weight bias in the above example were rearward enough and the rear tires were...
Ah, yes jacking. So if the roll center at the rear is at ground level always, the front takes all the roll forces, it is a solid axle, and there is zero roll resistance at the rear then the rear tires will be evenly loaded?
