Some more picture of aircraft from the 1920’s. These are from Page’s “Modern Aircraft”
The 1920’s were a period of experimentation and development for the aircraft industry as the lessons of WW1 were absorbed and young engineers worked to create aircraft that could serve a variety of functions.
First we start off with light than air craft, which were going from balloons to functional aircraft not too much different from the Goodyear blimp we love today.
The wings on aircraft got more structure internally as it was realized just how much drag the wires if a biplane created.
The old box like structure of WW1 was being supplanted by new all metal construction.
Better power plants would lead to larger and faster aircraft.
The instrument panel actually had instruments to tell the pilot information that could help him fly at night or bad weather. Necessary for the operation of commercial and mail traffic.
The aircraft at the end of the 1920s was a different animal from the beginning with the pilot being enclosed inside the aircraft.
Larger multiengine aircraft with more powerful engines.
More streamlined and no wires.
With racing aircraft all these things led to some very extreme aircraft as manufacturers and countries vied to win trophies such as the Schneider Cup.
to end this up here’s a Ford Trimotor video.