7

It never got off the drawing board (literally). I have a few sources that suggest that the scientists never got beyond some basic technical drawings and schematics related to the Sun Gun. Admittedly, they aren't the best sources I could hope for, but they agree, so I'm inclined to believe them. The idea was conceived by Hermann Oberth in 1923 (and ...


4

It is hard to answer the question as asked because it presumes that people first developed the idea of air drag force that alters motion of objects on Earth, and then realized that laws of motion can be made universal by taking that into account. This is not, however, how things progressed. People knew of air resistance, in some fashion, since prehistoric ...


4

How or where did the Wright brothers develop the expertise to formulate quadratic equations to design their first propeller? The Wright brothers developed no serious theory for designing propellers. Wilbur Wright, in one of his notebooks, wrote the calculations you can see in the attached picture. He applied no calculus, no quadratic equations, but used a ...


3

I'll expand a little bit my "oracolar" comment above (with less fun) : They have studied physics and mathematics, and physics and mathematics, and ... There was "explorations" of "outer layers" of atmosphere with balloons. There ware the "experiments" made with rockets (mainly German) used during WW II. But mainly, there were faith in the immense power ...


3

This explanation has probably been independently 'rediscovered' many times, and it is unlikely to be able to point to a particular origin. Ackroyd says in 'Babinsky's Demonstration: The Theory of Flight and Its Historical Background' (Journal of Aeronautical History, 2015): Imagine that two adjacent air elements ... A and B ... are about to reach the ...


3

The asymmetric shape (not its explanation with "equal transit time"!) comes from the first mathematical theory that explained the lifting force (Chaplygin's formula, known in the West as "Blasius theorem"). I suppose that the theory of "equal times" was developed in attempts to explain the Chaplygin-Joukowski theory to non-mathematicians:-) Under certain ...


2

"Hat der Körper eine gleichmäßige Geschwindigkeit in ruhender Luft, so wird auch in der den Körper umgebenden Luft eine gleichmäßige Bewegung eintreten, die im wesentlichen darin besteht, daß die Luft vor dem Körper sich auseinander thut und hinter dem Körper wieder zusammengeht." Otto Lilienthal 1889 Which translates as "If the body has a constant speed ...


2

Klaus Weltner and Martin Ingelman-Sundberg (from the Department of Physics at the University Frankfurt) in an ultimately unpublished paper, “Physics of Flight — reviewed”, submitted to the European Journal of Physics in 2003, argue that the original source for the misconception of “equal transit time” was, somewhat unwittingly, aerodynamics pioneer Ludwig ...


2

The popularity of the equal transit-time fallacy is a bit more complicated than a mistake spreading from a single source. It is simple, intuitively appealing (blowing over an airfoil is often invoked, along with an erroneous picture of flow lines around an asymmetric wing), and gets things done quickly. Just like the "explanation" of seasons by the Earth's ...


2

Drones fly on the same principles as the ordinary airplanes or helicopters. So the main difficulty in developing of drones was the problem how to control them, not how to make them fly. And this problem of control has nothing to do with birds or insects. Actually airplanes have also little to do with birds and insects because they use different aerodynamic ...


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