Originally posted by weaselsan
Actually it's the props you hear. where we had a large advantage until Mitsubishi sold the technology. But we'll leave that for a different thread.
If a sub doesn't engage it's batteries...it doesn't move??
As I said earlier... to many if's for China to attempt an invasion.
losses would make it not worth the attempt.
1) "Several mechanisms for noise radiation from the submarine exist, which are more or less prevalent depending on the frequency band, speed and depth of the submarine. Among these mechanisms are hull vibration, power plant equipment, propellers and flow noise (hydrodynamic noise)." its not just propellers
2) not what I said but you can try to change my words...A diesel sub can not go silent without engaging the batteries. Diesels are particulary noisy pieces of equipment.
3) ever heard of an invasion that wasnt full of if's?