The Ship Model Forum

Right. The hull emitters are often difficult to spot, but the stern ones are very apparent. Although it's not a fleet boat, this photo shows the aft piping on the Tang (the pipes look pretty much the same on GUPPYs):

_________________
Under Construction:
1/350 Typhoon
1/350 Skate
1/350 USS Nautilus
1/350 Tang
1/350 November
1/350 Hotel II
1/350 Alfa
1/350 George Washington
1/72 Type VIIC

When did this system originally debut? Did the Soviets ever come up with something similar?

I'm not sure exactly when it was first at sea, but the idea appears to date from the 1920s, although the application was to provide an acoustic baffle for a destroyer sonar. The use of bubble curtains for quieting came right after WWII. I would guess that the GUPPYs got it around 1960, plus or minus five years maybe.

As for the Russians, I recall seeing a few things on some of their diesel boats that look like girth emitters, but I wasn't able to find much (I don't know what such a system is called in Russian).

I found an interesting paper on the subject (which you can access via sci-hub): https://doi.org/10.1190/1.1441340

_________________
Under Construction:
1/350 Typhoon
1/350 Skate
1/350 USS Nautilus
1/350 Tang
1/350 November
1/350 Hotel II
1/350 Alfa
1/350 George Washington
1/72 Type VIIC

My resin 1/350 version of a Guppy submarine is in the “ What’s New” section. Unfortunately, the ModelWarships main page has not been updated to reflect the posting of my model as well as two additional models.

Tom

_________________
Tom Dougherty
Researcher for: "Project Azorian”
https://www.amazon.com/Azorian-Raising-K-129-Michael-White/dp/B008QTU7QY
"Project Azorian: The CIA and the Raising of the K-129" Book
https://www.usni.org/press/books/project-azorian

Here is Tom's Becuna:

http://www.modelshipgallery.com/gallery ... /index.htm

Thought this would be of interest to some here, details of the passive sonar on the USS Cochino (some interesting images showing the streamlined sonar plus drawings as well as operating details). I hadn't seen this before, maybe it's also new to others:

https://www.mulsannescorner.com/models/Submarines/USS%20Cochino/AD1135105.pdf

Excellent find, thanks for posting!

Jacob

_________________
Under Construction:
1/350 Typhoon
1/350 Skate
1/350 USS Nautilus
1/350 Tang
1/350 November
1/350 Hotel II
1/350 Alfa
1/350 George Washington
1/72 Type VIIC