Coaxial helicopter transmission

[carpandean]

Anybody know a good source for diagrams of helicopter transmissions (well, actually everything from the engines to the rotors)? While standard single main rotor/tail rotor would be good, I really would like a diagram of a coaxial system like those used on most of the russian designs:

http://avia.russian.ee/air/maks/ka-31.jpg
http://avia.russian.ee/air/maks/ka-50.jpg
http://avia.russian.ee/air/maks/ka-226.jpg
http://avia.russian.ee/air/monino/ka-25.jpg

These types of images are good, but I would like more detail. Thanks.