Pilots for the most part are visual kinesthetic learners. A few pictures and illustrations go a lot farther for a skill like judging deflection. The Germans had a lot of math but, many illustrations to support the math. There is a $25 book at Amazon which is the bible of everything aerial gunnery German ww2. I keep seeing pages from it in Russian blogs when they are beating each other up over the nuances.
http://www.amazon.com/Luftwaffe-gunnery-techniques-instructions-mini/dp/0889920028Luftwaffe gunnery techniques: The official gunnery techniques instructions for German fighter pilots and air gunners, 1943-1945 (Valkyrie Publications mini-series)
