Hi Rotorheads,
Hope everyone is doing well. This is my first time posting on a forum, and I am also very new to the world of helicopters.
I am currently doing some research on transmission systems for my master thesis and a group design project. I am curious to know if any of you have any recommendations for books/ articles/ reports that might help me
understand the design, materials used, advantages, and limitations of current transmission systems used for large helicopters (especially twin engines).
I have so far gathered enough research to understand the basic components, and I have also managed to somewhat understand the structure from looking at schematics on google images

. Youtube has also helped, however, I would love to know if YOU know of any great sources, or if you have time, to explain the transmission systems for twin engine helicopters.
Thanks for your time,
John