re: #357 Rustler

Magnetic sigs are problematic as there is a ceramic and rubber insultation on the external hull. The void is more than just a lack of echo like a black hole in space it actaully sucks in and absorbs surrounding noise. The Screws tend to be shrouded to muffle cavitation sounds as well.

Cavitation occurs only above a certain speed, so if they were running slowly they wouldn’t hear the screws.