14 ms·
There is passive sonar too, which is just listening.
by andkenneth 3y ago
There is passive sonar too, which is just listening.
- regularfry 3y agoRelevant to this: unimaginably vast amounts of effort have gone into making propellers a little bit quieter so they are harder to hear while still allowing reasonably high speeds. A lot of that is to do with avoiding cavitation at the prop tip, which is a) noisy, and b) very destructive. no prop, no prop noise...