Alrighty, here’s a page on a King Kong site which seems to answer some questions, and maybe raises a few more…
King Kong FAQ (You may have to scroll up a line or two…)
Specifically mentioned are the Curtiss O2C-2 (Fledgling) and the Consolidated NY. Whether this information is reliable or not, I cannot say. But they do mistakenly refer to both types as being trainers; the O2C-2 was certainly not used in a training role at the time King Kong was filmed.
The aircraft in the foreground of the second photo above is undoubtedly the mockup and, as such, probably doesn’t truly represent a real aircraft type. Although it does seem to have some characteristics which are similar to those of the airplanes mentioned as having been used in the film.
Speaking of the two images above, I wouldn’t discount them so readily. They do give clues as to what was used for the aircraft in the film. They are certainly retouched, (the second moreso than the first) I don’t think that there was ever any doubt about that; a good majority of the photos appearing in print in the 30’s were retouched and that kinda thing is hard to miss, actually. And ‘fanciful’ may be the word, but so was the movie itself and the special effects used for the movie were not much more sophisticated than what was done to produce those images.
I’d say that, although these may not be actual stills from the film, they probably show the same combination of models, possibly real aircraft, and the full-scale mockup which were used in the film. Perhaps not the real aircraft, but certainly the models and mockup.
Something else I’ve come across is this photo of noted aviator Frank Hawks next to an aircraft at Bennet Field in 1933.

The real aircraft in the film are said to have been based at Bennet Field and the insignia on this plane is quite similar to the one on the side of the mockup. This doesn’t mean that this particular aircraft was used in the film, but it’s an interesting detail, especially if one is looking to build a model representing the aircraft in the film. I dunno what unit this is, however. Still looking on that…
Fade to Black…
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