Whatťs the difference between X&X and X&Y planes? - DA.C
 

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Old 01-18-2018, 05:36 PM   #1
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Question What’s the difference between X&X and X&Y planes?

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.
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Old 01-19-2018, 10:42 AM   #2
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Default Re: What’s the difference between X&X and X&Y plan

You'll find answers here

https://en.wikipedia.org/wiki/United...le_designation

And yes, there is a "Z" prefix.
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Old 01-19-2018, 02:50 PM   #3
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Default Re: What’s the difference between X&X, X&Y planes

Thanks, that's exactly what I was looking for, and very interesting.
And complicated!
Anyone know if there's something similar for the UK?
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