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.
David Valencia, Bristol
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
500+ collector, teacher and aviator
Faves: SR-71, Concorde, Tu-160, Handley Page Victor, 747, plus anything weird or ugly.
WishList: G-BSST, Aerion AS2, Ankair, AvroArrow, Boom Overture, Bristol 188+Brabazon, BN Defender, Craic C929, Embraer KC390, Fairey Delta2, HALTejas, IrkutMC21, Lockheed L2000, MiG1.44, McDonnellDoug YC15, Myasishchev 55, NALSaras, Northrop MQ4, PacificSun DHC6, PZL M15 Belfegor, SukhoiT4, Transavia PL12 Airtruk