SUBSIM Radio Room Forums - How does the sub avoid cutting towed array?

Quote:

Originally Posted by PurpleCow (Post 2499709)

The 688 sub looks like the propeller is not shrouded. How to they avoid cutting their own towed array cable during turns?

It is not mounted near the propeller; in effect, every individual sub works out it's own operational procedures and maneuvering limitations during training.

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Effective use of the towed array system requires a vessel to maintain a straight, level course over a data sampling interval. Maneuvering, or changing course, disturbs the array and interrupts the sampled data stream. These periods of instability are closely tested during sea trials and known by the crew's officers and enlisted sonar experts. Modern systems compensate by constantly self-measuring the relative positions of the array, element to element, reporting back data that can be automatically corrected for curvatures by computers as part of the beamforming math processing.
A ship must also limit its overall top speed while a towed array is deployed. Hydrodynamic drag increases as a square function of velocity, and could tear the cable or damage its mooring hardware. Furthermore, a minimum speed may have to be established depending on the buoyancy of the towed array. The array could also be damaged by contact with the seafloor or if the vessel operates astern propulsion, or can even be damaged if it bends too tightly.

https://upload.wikimedia.org/wikiped..._submarine.JPG< on an Akula the array is mounted in the vertical fin teardrop. TB-29 array on US sub> http://www.navlog.org/TB-29A_towedarray.jpgin detail> https://fas.org/man/dod-101/sys/ship...owed-array.gifhttp://www.militaryaerospace.com/articles/2015/04/nextgen-sonar-arrays.html