That is an American flying Boat. Done quite a few years earlier. Howard Hughes was in the cockpit when that picture was taken. The world had to wait for the 747 to get an airplane with larger proportions.
I visited the museum where that is stored. Largest radial engines ever made.
The government should have bought a hundred of them and really opened up the Alaskan interior. You probably know of the political trials at the time, Howard finished paying for the construction of that one himself.
I’ve always had a fondness for radial engines. I think they are underrated. I’ve immagined an eight cylinder air cooled radial two stroke diesel. I’m not sure how the crankcase would look in a two stroke radial though. But someone should make one. I think it would be amazing.