"Hints" are difficult, because if you get at all specific ("Schneider Cup." "Convair," "ace" or whatever), anybody who knows how to do a Google search can easily find the answer, so I specifically tried to phrase the question(s) to avoid that.
This was a fairly spectacular event--especially if you were there--that happened within the lifetime of many members of this forum, judging by the comparative decrepitude of modelers, and short of telling you the answer, that's my hint.
Hey, you guys are supposed to be more knowledgeable than simply reciting which was the first jet to land on a carrier, the first 10-engine airplane, who the Enola Gay's bombardier was, or which piston-engine airplane holds this or that speed record, right? My daughter knows the answers to those things, and she doesn't even build models...
C'mon, people, rise to the challenge.
Stephan