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I will have a better answer tomorrow, but from my father-in-law's recollection it was actually an Australian physicist who first worked this out.
He also 'proved' (mathematically), that small variances in the shape of the engine nozzles would have exactly the effect seen.
He was a physicist at CSIRO for years and knew the man in question well.
I'm an idiot and can't remember his name.
(The postulating scientist. Not my F.I.L. His name's Chris).
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