XB70 never entered in production due to :
a.. the development of accurate intercontinental ballistic missiles (ICBM), or their maritime counterparts submarine launched ballistic missiles (SLBM),
b.. the development of efficient Soviet surface-to-air missiles (SAM) and the MiG25 FOXBAT interceptor, able to hit bombers flying at high altitude and high speed (see the number of U2 spyplanes shot down),
c.. high development costs, during the Vietnam war-era,
d.. a crash,
e.. lobbying,
f.. other reasons I don't remember.
Sorry for my syntax, grammar and poor vocabulary. I'm French but I try to improve my English/American.
I'm ready to discuss about aeronautical subjects with anybody : I'm a pilot officer stored in a awful headquarter office. Please, help me!


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Greg Farr added these comments in the current discussion du jour
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Attachment decoded: Great Egret landing 2.jpg
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Attachment decoded: XB-70.jpg

I see your point, Greg, but the XB-70 is just a tad bigger! grin
I remember looking at the one then outside of the Wright-Patterson
AFB USAF Museum, circa 1986 or so. What a huge but beautiful bird!
Not being a military aircraft guru at all, I never learned why the
XB-70 was never developed or even tested beyond (I think) only 2
prototypes, but then, a lot of aircraft and other weapons never get
developed or have a very short life.

--
HP, aka Jerry

"Never complain, never explain" - Henry Ford II