If this article was interesting for you, I'd suggest Greg's Airplances and Automobiles youtube channel.<p><a href="https://www.youtube.com/channel/UCynGrIaI5vsJQgHJAIp9oSg" rel="nofollow">https://www.youtube.com/channel/UCynGrIaI5vsJQgHJAIp9oSg</a><p>Rabbit Hole warning: The channel features discussions on many different aspects of plane design and performance, but focuses heavily on primary sources. You will learn a lot about what NACA was doing at the time. I'm not really a plane person, but this channel was fascinating.