Specifically US based fighter aircraft; why do we skip numbers? I mean we went from the F-14 , F-16, (no F-17?) F-18, then jumped from that to the F-22 and the YF-23 and now the F-35. I assumed it was a generational thing at first then I thought, “What about the F-117 Nighthawk and the SR 71 Blackbird…?”
Edit: Thank you all for your quick replies, it was a conversation topic that popped up at my job and figured I’d ask the fine folks here who are more versed in this sort of thing.
Also…I know the SR-71 isn’t a fighter and was used for recon missions. -_-
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Many in the lower F series are named for the design number, and they skip numbers for the designs that never made it to production in favour of the next one.
But there’s also plenty of examples of them NOT following this pattern for a variety of reasons, for example the F-117 should have been the F-19 but they changed it to try and confuse the Soviets.
There are many sequential F aircraft, as noted on wiki: https://en.wikipedia.org/wiki/List_of_military_aircraft_of_the_United_States#F:_Fighter
There are also some that were specifically non-sequential, like the F-117 and F-35. The SR-71 is a reconnaissance application of the B-71 bomber (which never made it to production); it kept the numbering to reflect the developmental ties.
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