My "Parlez vous en Anglais?" was intended to take the piss out of my own poor technical knowledge. You'll see that I did go away and find out what a Nacelle was. Perhaps my awful sense of humour doesn't go down well in text, my apologies.
I now see the irony in me using French to ask a question, when the word confusing me was a French word
Your help is greatly appreciated with or without the annotations-for-dummies. If you spoon feed me, that's great. If you provide minimal info, I'll hunt for the rest.