The photo is Bernard Zee and has many more interesting Chinese Airshoy
In my daily visit to the forum AVA I found a delicious recommendation of Gadget. This is a declassified document of the Second World War , about how to regulate the convergence of 12.7mm guns that were mounted on the wings of fighter jets. Take into accountaircraft speed, the speed of the bullet, the mass of the same, the angle to the string of unit ... As expected, in English, click on the image to access it.
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