The Thread of Prototypes Only

hi,I’m very interested in the first prototypes of the aircrafts,I contemplation these prototypes always and I notify its not only a prototypes,but she’s a great antiques.
plz post any prototype with information
1-Boeing YC-14A,this is 2nd prototype STOL transport aircraft.
2-McDonal Doglas YC-15A Experimental prototype that never went into production,C-130 win.
3-F-15B Eagle,this prototype of Strike Eagle,F-15E
4-Sud SE-3200 Frelon 1959,prototype of Super Frelon after. 😮
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