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I'm not an aero enginerd or anything, but why have a delta wing if it is subsonic? I thought the delta wing was best for supersonic flight, (i.e. concord, space shuttle, b-1...)
I saw one at an air show at Carswell AFB back in the mid-80s. Incredibly manueverable for an aircraft its size...it put on a better show than the T-birds or Blues (can't remember which team was there that year).