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Rammjaeger,
I do not think he was refering to the technical term of the "Gleitzahl" as used by the scientists back in WWI.
Maybe he was reffering to some modern term describing what he said, but I am not aware of this.
Anyway, your question is quite interesting and I would also to know much more about it since I have not yet found any source that makes any useful statement of the behaviour of different aircraft when the engine is turned off. I think this is due to the fact that indeed every aircraft is different as pointed out by Rex Feral.
If you find more, please let me know.
Achim
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