So I have modeled a scene where a an object falls into rotating fan blades. I have all the physics set up in addition to the bullet constraints. However when I animate the falling object I have to uncheck start deactivated to get it to fall. But when I do this as soon as the object hit the fan blade the whole object fractures. What I would like to have is only the pieces in contact with the fan blade facrture. So as the object falls it feeds itself into the fan blade. I have tried key framing it, unsuccessfully. I have tried to figure it out the last two evenings, but I cant seem to get it. I have googled and searched the forums, but its sucha specific thing I am looking for and there is not much for 2.71. Using Physics and simulations, Cell fracture and bullet constraints as search words pull up a pluthra of stuff. But I cant seem to find anyhting that addresses this.
Thank you for your time.