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This month, a photograph appeared on the Internet of the propeller on an Ohio-class ballistic missile submarine at Trident Submarine Base in Bangor. A key to the submarine's ability to deploy and remain undetected, propeller designs have been kept under wraps for years, literally. When out of the water, the propellers typically are draped with tarps. Several Navy watchers said the now-widespread propeller photo marks a first. "It's the first time I've seen that in the open source".
Originally posted by Kacen
Can someone please screenshot it or something I don't feel like downloading a program just to see this.
Originally posted by Zaphod58
The Japanese gave the Soviets the design for a new propeller for the Akula submarines, and it was quite a shock when they were suddenly sneaking up on our Los Angeles class attack subs without them having any clue the Akula was there until it was too late.
The machines are used to make complex propellers for Soviet submarines, viewed by Pentagon officials as a major setback for American military forces. The new equipment has apparently made it far easier for Soviet subs to elude detection in recent months. Noise from propellers is a key factor in tracking undersea movements of the Soviet Navy.
This in turn indicates that rafting and other, more advanced quieting techniques first adopted by Thresher in the United States were probably adopted by the Soviets only with Victor III. It also demonstrates the significance of the Toshiba, nine axis milling machinery obtained by the Soviet Union which gave them the ability to make the kind of skew back propellers that reduce blade rate tonals.(84) This technology, combined on Akula with the quieting technologies already demonstrated on Victor III, gave the Soviets by the mid 1980s a nuclear submarine that could elude SOSUS and frustrate efforts by tactical ASW platforms using passive sonar to establish and maintain contact with it.(85) At long ranges its narrow band, low frequency tonals had been reduced below the source level of its continuous broadband signature, and the source level of that broadband signature was close or equal to that of American Sturgeons and early 688s.(86) Absent a strong narrowband tonal structure, and with low broadband source levels, passive acoustic detection, classification, and localization of submarines becomes quite difficult at long range, and counter-detection becomes more likely at shorter ranges.