MAX’s Return Delayed by FAA Reevaluation of 737 Safety Procedures

[BDAttitude]

Originally Posted by DaveReidUK

I think you mean momentum, rather than moment of inertia (though KE might be a more appropriate metric), and I don't really see how raising the engine (but with a thrust line the same distance from the aircraft's centreline) would make that much difference to the risk.

But re grandfathering, it's tempting to wonder at what stage in the Max development did Boeing wake up to the possibility that the heavier fan and HPT on the LEAP engine meant poorer containment characteristics, if indeed that's the case (npi).

To be more precise this is what I meant:

Larger fan diameter = larger anglular momentum, higher KE at impact.
New engine position (fan clear of the wings) = higher capture cross section of the fuselage