Mike E wrote:BUT! Like always.... They quote the ONI's "not as quiet as the Virginia" claim. The West doesn't know how quiet the Yasen is,
Yasen is more noisy when it run with maximum speed. But the maximum speed of Yasen is much faster than Virginia.
If Yasen and Virginia are moving at the same speed, Yasen is much more quieter.
It is said that Yasen has a thick and complex rubber layer which mimics the skin of dolphin. When sound is absorbed, it does not resonance and causes whirls. Honestly, physics and dynamics is not my fields, but it is said that, the rubber layer is the reason why Yasen is quieter and faster although it is bigger and has weaker engine. (anyone can explain it to me ? )
In addition, when standing still, Yasen is also much quieter. The reason is that, in low speed and standing still mode, Yasen only uses small turbine and accumulator battery. Furthermore, Yasen is bigger, and uses weaker engine, therefore less heat is emitted and the heat is less concentrated.
So, saying "not as quiet as Viriginia" is very misleading.