[Spktyr]

Good enough that this quote is in the Wiki article on the class:

“According to Admiral Foggo, the commander of the US Naval Forces Europe, the Yasen class submarines are “very quiet, which is the most important thing in submarine warfare”. It’s claimed that Severodvinsk is far quieter than previous Russian SSNs, capable of 20 knots while running quiet, which is equal to the Seawolf class and inferior only to the Virginia class (25 knots). Other sources claim that Severodvinsk is capable of even 28 knots in silent mode.”

Assign that whatever value you wish.

The prop design is probably some variant on the many-bladed, skew blade, narrow/short chord that’s popular these days.

A history of Russian props: https://imgur.com/a/t6UjU

[Navy Patriot]

Thanks again, Spktyr!

[Navy Patriot]

What one can see of Arkhangelsk, she looks to be fast, maneuverable and she has tabs!

Maybe eight blades?

Not sure about acceleration, but that's not usually a critical factor.

Still, I'd take a ride!