Just a quick question, how do I make some helicopter blades that spin and don't stop. I have been fiddling with the rigid body attributes and I have got the blades to accelerate but they eventually start turning the other way round which isn't so bad since the speed they are going at it isn't so noticable but then they slow down and stop before starting the cycle again. The bit with them accelerating is useful but I need them to keep going rather than stopping, at least long enough for me to finish the animation, it's 720 frames long if that helps you work out how to change it.