Algodoo

this car is better but some times, just sometimes, i like to not have to save the car, then put it into a scene....please dont let the picture have a plane in it but in the scene there isnt....thats kinda like false advertising but with phun..... great car though!!

Thanks. And sorry for this stupid stuff I wrote in the description. I did not get the meaning of plane (flat ground) at first. I thought about a flying object and because of that that you wanted to spam. Well, the problems that show up when you don't learn English as your mother tounge. I apologise a thousand times for that. I am going to change it and also the comments I wrote so far.
I will add the flat ground in my scenes.

haha, sorry, i can understand where you are coming from.

haha

yo dude that car is really cool can u put um a tutorial on how to make cars in your way and if you can put the vid on youtube plz.

Actually it is very similar to the tutorial that is on YouTube already (thanks to the creator).
I simply take my cockpit and draw the body around it. Then I cut it in many but not too many parts and add the big hinges. The rest is like in the video. I just use a less realistic design for the supporting elements. For me the focus is on stability. This makes my cars a bit stiffer and less rubber-like in comparison to many other crash cars. Also, the biggest part of my car's body is not set on "no selfcollision" (good for massive head-on collisions).
The rest is a lot of testing and tweaking until it crumples the way I want it to do.
It's really not that hard, just time consuming.
One last advice. Save often and save it in multiple files. Sometimes you don't realise a mistake and continue to work with it. If you can't redo it you will have a big problem later.

Before anyone asks this I decided to give the answer by myself.
There are three reasons why I don't add any parts that cover the interior structure of my cars:
1: I'm too lazy .
2: My PC would not be able to run it (I have to delete the blood already ).
3: I like to see what happens to the structure during the crash (makes tweaking a lot easier).
Sorry to everyone who wanted a car to look at it. Mine is for crashing.

what does it crash in to?

Sorry for the late answer (I don't check the comments regularly).
It's just the car. I try to name the scenes in a way that let's you know what you have to expect so here it would be my new crash car with realistic ragdoll.

we want airbags! =3