What the heck, let's add another clue.
Again, I'm looking for an aircraft:
1) This plane actually was rejected upon it's initial submission to it's home country's military
2) This plane later became so successful that it had seven variants produced
3) Many of the aviation "experts" of the time felt this plane was not as good in the role of a plane it replaced
4) Depending on the variant, this plane could have a crew of one or two
Good Luck