A few nice Helicopter transmission images I found:

The helicopter approaches

Image by Valard LP
Valard crews participate in helicopter training, where they learn to work off the skids of helicopters to enter on and exit off large steel transmission towers.

Helicopter setting a transmission tower

Image by Valard LP

MBB BO105 Engine and Transmission

Image by schoschie
Im Deutschen Museum, München
Die rechte Hälfte ist die Gasturbine. Eigentlich ziemlich klein für so einen dicken Hubschrauber.