There's one aspect of gameplay that just keeps on coming back in rF2. Simulated forces and effects work well when all four wheels are on the ground but it seems that as soon as that scenario changes the car has different properties. What seems to happen is the car obtains weightlessness, its inertia level seems low and it picks up rolling/lift momentum very easily. Examples: At 1:05, 2:20, 3:02 These two videos highlight the lift aspect, the first has the rear of the car suspended in the air instead of having the weight of the car and gravity pull it down. The second video with the karts present the kart as an object with little mass once the lift has exceeded a certain angle and the ensuing momentum of the roll, ending with great flair as it is sent to the skies (historic F1s in Spa anyone? ) after a collision with an object with the same properties - yet the colliding kart behaves differently while the flying kart appears to have 10% of its actual mass. This is present throughout the game as is not car-specific.