Quote:
that is unless you wish to armour the engine with 1inch thick titanium all over.....
That would result in more fuel consumption and green peace having a shout!
Halloween, Heathrow, and all others:
An inertial navigation gyro from the '70s, some 1kg or so of metal , 15cm disk diameter and rotating at maybe 25000 RPM, will sometimes go right through a wall if it disintegrates during gound testing (not a common failure mode in flight, thankfully
). Here you're talking about a 12000 RPM turbine disk that's over ten times that size. Remember the stored energy is proportional to the square of tangential speed at the circumference, times the mass, and you get an idea of the destructive power of such a disk. No sense trying to design an aircraft to stop that once it goes off. That's why they're supposed to be designed with enough safety margin!
-- Edited on 05-Nov 15:37 CET to correct factual errors --