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Originally Posted by M21Sniper
How's it you're comparing the first flight date of the northrup bird to the first 'on-paper' date of the Su-25?
Six companies submitted designs in 1970, so it is quite reasonable to expect those designs were not just sitting there waiting, but had been developed to some degree (on paper of course) for some time before their designs had been submitted.
When was the USAF A-X RFP first issued? Anyone know?
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Why would the Russians copy a design that hadn't even flown yet? Seems kinda stupid to me. It's a pretty obvious design, sounds like convergent evolution to me.
