#15 TK-208 was fitted with five-bladed symmetric screws initially. However, by the 1990s, all Typhoons had seven bladed skewback screws, which are much quieter.

Project 941 Akula: The Majestic Typhoon Submarines from the Cold War era

#15 TK-208 was fitted with five-bladed symmetric screws initially. However, by the 1990s, all Typhoons had seven bladed skewback screws, which are much quieter.

WWII