Quote from Degats :

Looking from the best angle I can from shift+u, the final corner curb is about 20cm or so at its top. A few real racetracks have similar curbs, so it's not that out of the ordinary.

I've seen SS cars get launched on another's tyre and not sustain any major damage (usually will break something though) and the forces involved there would be higher than bouncing off a curb at a guess, so not sustaining damage on that curb wouldn't be out of the question. At that kind of speed I wouldn't have thought it impossible to roll a car hitting a similar curb in RL, especially with the amount of lateral force going on. I've seen touring cars almost roll on shallower curbs, although it's usually corrected by the driver so they don't actually roll all the way.

As far as loss of downforce and breakable wings are concerned, Scawen has said that breakable wings are in the works for S2 to get out of alpha, so I would assume loss of downforce will go along with that.

Touring cars produce less amount of downforce compared to an open wheeler when both cars travel at the same speed. I've never seen a one seater rolling over by hitting a curb and of course drivers do mistakes in real races too. There are plenty examlpes of race drivers loosing control while turning...

And if I'm not mistaken the grass isn't lower than the curb in turn 1. If there was a height difference and the wheel stepped from +20 cm to 0 cm in a split second I would expect a major accident. But in my case in the first corner I don't even have contact with the grass... And even if the curb is 20 cm high it is not an instant step from 0 to 20, but the curb is an angled area.

edit: Look at a BMW rollover crash test --> http://www.youtube.com/watch?v=Z0I4fmttN7Y&NR=1 at 2:00". Look the height of the ramp they use. In turn 1 I had almost the same results with lets say the double speed from this crash test but with a car with much better downforce and a curb which can't be compared with this video's ramp. And as I said if the curb gained 20 cm vertically it would definitely be a disaster to ride it. But the curb is angled. The only thing it happens is that the right wheels aren't on the same level with the left ones. I don't see why this should cause a rollover.

I apologise if i wasn't very clear about the height of the curb - I meant 20-25cm above the road/track level. The angle relative to the track looks to be about 30-40 degrees, which is fairly steep. If it was vertical, the wheel would be ripped off, no question.

Regarding the BMW video, IIRC when rehersing for the DB9 roll stunt in Casino Royale (James Bond) they were only using a ~30cm high ramp (if that) at about 10 degrees or so. To get it to roll, they turned into the ramp hard to generate lateral-G which makes it much easier to roll. The DB9 has a much lower centre of gravity and is lighter than the BMW, but they still managed to get a roll by exploiting latteral-G.
As another similar example, there are a few videos floating around youtube, where road cars have rolled by hitting a normal curb (12cm or so) at low speeds of around 10-15km/h.
A UK TV show - Fifth Gear I believe - rolled a BMW just by sliding it in the right way on a dry skid-pan.

Bearing in mind the lateral-g involved in the FBM in the replay (curb example only, I havn't seen the other one) of about 2g (twice that of what most road cars can manage), the height and angle of the curb and as such the forces involved, the high-ish ride height of the blackwood setup and the fact that you don't get a huge amount of downforce at ~90km/h, I don't think we can easily say categorically that it would be impossible to roll an FBM in the same circumstances in RL. It may or may not be possible, but IMO it could go either way. Had you steered into the slide, it wouldn't have rolled.

I've also just noticed that at exactly the same time you lifted off the power, the speed of the roll dramatically increased. This could have been caused by a change of engine torque on the chassis and/or changes in rear wheelspeed and/or the rear wheel slipping less and gaining grip. Had you kept on the power it might just have not rolled.


I'm not saying the physics involved in LFS are perfect, but I don't think we can conclude for certain that they are significantly wrong in this case either.

Quote from Costas Athan :

Because I consider 100 kph as a slow speed for a one seater, slow enough to prevent rollovers. (In fact slow enough to prevent many kinds of racing accidents).

If my physics serves me right, speed makes no difference, and infact you'd be more likely to roll at lower speeds due to the downforce.

EDIT: Thats complete BS. Ignore me

All this may or may not be fixed with the new tire physic patch.

Quote from Scawen :

One of the reasons for this was that the LFS tyres had too much grip and this was causing the inside wheels to lose too much load while cornering.

There might be less grip from load transfer to the outside wheels causing them to slide instead of roll over.

However, that is just an assumption, not based on fact.

Quote from legoflamb :

All this may or may not be fixed with the new tire physic patch.



There might be less grip from load transfer to the outside wheels causing them to slide instead of roll over.

However, that is just an assumption, not based on fact.

You may have a good point. I had modified 2007 Sauber BMW F1 1.00 rFactor mod's tires in order to gain more grip and it was really easy to flip the car. So by reducing the grip sliding will be easier but rolling over harder.

Quote from Costas Athan :

So by reducing the grip sliding will be easier but rolling over harder.

Who are you who are so wise in the ways of science?

Quote from Forbin :

Who are you who are so wise in the ways of science?

I am a university student. But it's not a matter of wisdom or excessive knowledge. It is basic physics that we have taught since High School. Take a pen and drag it from the middle, it will move straight. Then do the same but make sure that you hold the pen's end at the same point. The pen will make a circular movement. The above experiment is so simple that you can try it yourself. Too much grip has the same effect as holding the pen's end still.