jimgriff
Clearly a swept wing jet can be force landed wheels up. The issue is whether it is sensible so to do.
There are several differences between a typical WWII piston fighter and a modern swept wing jet that come into play. If you accept that common sense dictates the need to keep the touchdown speed to a minimum in both cases (which of course means being close to the stall or maximum lift coefficient just prior to touchdown) then thanks to the shallow lift curve slope of a swept wing a very high nose attitude will be needed. This can typically be twice the angle needed with a straight wing – perhaps even more.
This means that when the tail hits the nose really slams down very fast from a great height and that impact can easily break your back. This effect is made even worse by the cockpit being up close to the nose as opposed to behind the engine and near the CG as with a typical piston fighter.
(A friend of mine was taxiing on the hard and had his Harrier nose leg snap off close to the top due to fatigue. The resulting impact when the stub end hit the deck broke his back)
If you do survive this slap down then should a swept wing tip dig in during the ground slide its point of contact is well behind the CG and not far out from the centre line and so the aircraft is more likely to roll into the inverted. Again not good.
To all this add the Genghis numbers and things look pretty dismal. Given the efficiency and reliability of modern ejector seats I suggest you would need a pretty personal reason to try it, rather than punch out.
JF