As to never haveing seen/heard this at an air show, perhaps it has something to do with age. I remember hearing this on occasion at shows, but then again I’ve been attending since a babe in arms (56 years), not sure how long ago I last heard this, but I always assumed that fuel is fed differently nowadays (fuel injection?).

I actualy spotted this phenomenon in 2007 at the Eastbourne airshow with a Hurricane…So it’s for real Cracking Door;)

That’s interesting; I’ve seen a fair few Hurricane displays and never heard it.

It is probably not advisable but it must be possible to produce the famed negative-G engine cut-out during an air display. I wouldn’t want any risks to be taken, so can appreciate that deliberately cutting the engine at low-level would probably not be wise, but it would be nice to actually experience it, if it were safe.