billovitch
There are several fundamental problems with that idea: what would hold such a band or cord in place? If it is attached to the blades, it only increases the weight of the blades, and thus increases the force on the blade's attachment point. It would need, in turn, to be anchored to something else, but to what? If you anchor it to the fan disk (the "hub"), it just creates additional structures that could break and fly off, and if you anchor it to the case, you basically have a containment ring, which is just what we already have. Any way you turn it, it makes no sense.
I'm also not sure you have a grasp of the stupendous magnitude of the centripetal force required to make these blades turn in circles. Assuming an effective radius of 0.5 m, a blade weight of 20 kg and 3000 rpm fan speed at takeoff, that would come out to roughly 1 MN ("100 tonnes") per blade! Show me the cord or band that can hold even just a substantial fraction of that.
Last edited by bsieker; 23rd Feb 2021 at 14:18.