Sir_Cliff
Well-Known Member
Does anyone know what failsafes are built into the ride?They aren't "legally bound" to do anything. If they fix the doors and an incident happens that causes an injury, they will be liable with or without design changes.
From an engineering standpoint, I don't understand how there would ever be a collision with the doors. There should be (and I imagine there are) sensors that detect the door is open and also detect the vehicle location at the point where it can be stopped before reaching the door. Simple logic should determine if the doors are not open when the vehicle reaches that point, an E-stop is triggered. The system should be designed fail safe with redundant sensors as well as sensors designed to fail in the "safe" state (will indicate door closed when it is actually open in the event of sensor failure).
If designed properly, there should only be an infinitesimal chance for the doors to be closed and the vehicle to continue and crash into them. To account for the infinitesimal chance the door material should be (and apparently is) low enough density to not cause a serious injury.
Other rides have far more dangerous potential failures but the systems manage to function reliably. If the ride system allowed the train on EE or Cosmic Rewind to begin motion with the switch track not in place there would be a derailment that could easily cause serious injuries yet those safety systems work reliably.
Obviously one of them is that the doors are designed to break away if they are hit so as not to injure guests... at least not seriously. It makes sense there would also be some sensor that would trigger an e-stop somewhere along the way, though perhaps that is problematic given the point at which the doors are supposed to open and the speed at which the car is travelling?
Like @mergatroid, I honestly don't know. I am just curious because this is being talked about as something that is very basic to design and repair, but obviously something has gone wrong here and I assume it is not because the Imagineers are incompetent or missing a simple fix.