Submarine S4 ?

[Sture Hultqvist]

[img]../images/sub9_c1.jpg[/img]


This is the first image of a recently found sub and


it is probably the Russian S4. So far we are very


sure it is a S type but wich one? There where only


13 of them in the Baltic sea and all of the have


known history. The location is south end of island Oland in the Baltic.


The closest one to this location is S4 wich sunk outside Poland! The second


closest is S2 reported sunk north of island Aland.


Sture

[Jan]

Re: Submarine S4 ?

Sture,


Very nice image, one question I have to asked... what type of transducer did you use ? (cone angle and frequency).


Are there many german U-boats in that area ?


I would think they would pass that area when leaving Kiel.


Regards, Jan

[Patrick]

Re: Submarine S4 ?

Sture,


What depth is that in?


Patrick

[Sture Hultqvist]

Re: Submarine S4 ?

The sefloor is on 51 meters.


Sture

[Sture Hultqvist]

Re: Submarine S4 ?

I have not measured the angle of the transducers, but


they where calculated to 0.8 x 60 degrees and 430 KHz.


The frequency is uncertain since the transmit is


a discharge and then the crystals oscillate on


different frequencies in the interval 400 to 600 KHz.


Sture

[Patrick]

Re: Submarine S4 ?

Sture,


The 60 degrees is as large as I have seen. Is this your design? Why would you want 60 as opposed to 40 (seems most common out there)?


Thanks,


Patrick

[Sture Hultqvist]

Re: Submarine S4 ?

Why vertical angle of 60 degrees?


It's giving very low side lobes and a uniform


illumination of the seafloor.


Sture