Algodoo

Hello, today i'm create this new scene for better version.

Controls : Shift - Stop engine (toggle)
Enter/Return - Engine Starter
Down - Stop
Up -accelerator
Gears 1,2,3,4,5.

Also maybe you can help me, i have small problem with creating spring engines. Other guys build engines with hard spring performance, and it works fine, but when I made a springy the same, everything I explode or disappear when I press start. I try is so many times, i just don't know what i'm do wrong.

Please Comment.