I take it then that the airfoils are to be sacrificial? I do not see how the IPT blades can clash with the LPT vanes without transiting the Stator "Platform".
They cannot get there from there. They have to slice through 10 centimeters of platform to access the Vanes. Now that may slow the Wheel, but the blades are lost anyway. If it is as you say, why provide an impediment to instantaneous clash post separation at the ARM? It is not sensible.
I was sure I asked more questions, and I'll stand by the scrub foils for now. May I choose one question to ask? How about the open space between the Bearing box and the bore of the IPT? Sufficient to restrain the IPT and offer a bearing for overspeed? Without allowing aft drift, or Disc eccentrics, wobble?
I prefer the TRENT7 pic to the more pedestrian T9drawing......Are they exactly similar? I see that they are not, the foils are pitched the same way. No contra.
Last edited by Lyman; 11th May 2012 at 19:11.