Get into birdwatching, same principle's apply. I can tell what kind of airplane is going overhead just by the sound of the engine. I can tell you what kind of prop and the type of engine,all by the sound. You will too once you pay attention to detail. Keep in mind I knew the names of every airplane and could indentify it when I was 8 years old. I couldn't play baseball because I would stand out in the outfield and name all the airplanes as they came over, distracting all the players. Coach would get really ppeeed off.