So let me ask you then re: your response. Does the GP have an IPT turbine that is affixed with the same architecture as the T9? Because if it is fit on to the shaft via keyway or splines, the overspeed would happen , should the key(s) shear, or the splines grind smooth. It is the false bearing that interests me.
So one question then. Can you show me the false bearing locus? Because any aft movement at all of the IPT in the TRENT puts the aerofoil ring into the LPT Stator. Isn't that accomplishing the same thing as the GE in wheel loss? Design aside, I see no room for false bearing to establish, without IPT/LP1Nozzle conflict. At 500 pounds, the IPT would take out anything in its way, and I do not see how you propose the Bearing box to contain it to capture gas path, and resultant spin up? The relative bore/diameter of this 'new' bearing/system does not look like it is up to keeping the Wheel from axial drift, and/or blade clash with LPT Stator.
I do not see the LPT vanes at all in the GE/PRATT.
Last edited by Lyman; 11th May 2012 at 21:01.