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Originally Posted by aaken
What makes you think it will be difficult to detect on active sonar? It may be small for nukes but has a nice section of 7 meters in diameter nonetheless. There are much smaller diesel subs than that.
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It's not only size that counts, it's also materials and shape. The B-2 is larger than F-16 but has smaller RCS because of both shape and materials.
Type-212 is said to has not only anti-sonar coating but also shape of it's composite outside hull is designed to reduce strength of sonar returns.