Firstly, I don’t understand the difference between X+number, and X+letter+number:
— examples of the former being the Bell X-1 or the Boeing X-37, all of which appear to be Xperimental and,
— examples of the latter being the XB-52 or XB-70 which appear to be prototypes.
Then with the prototypes, what’s the difference between say the XB-52 and XB-70, and Y-planes, e.g. Boeing YC-14 and McDonnell Douglas YC-15, both of which I believe were predecessors of the Boeing C-17?
Is there such a thing as Z planes?
Do you know of any wiki-type articles which might describe this?
Thanks for any advice.
David Valencia, Somerset
600+ collector, teacher, aviator
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