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At random: A submarine, the TURTLE, was employed by the American revolutionary army to attack the British. It was built by David Bushnell at Saybrook, Connecticut, just a few miles from the present site of Electric Boat Division of the General Dynamics Corporation, and the U.S. Naval Submarine Base.
Guppy II boats.......design question....
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Bob Melley
Posted 2007-11-14 9:11 AM (#9190)
Old Salt

Posts: 256

Subject: Guppy II boats.......design question....

Anything "hang" just below the bow on these subs??????
I have a starboard side view (color drawing) of USS Blackfin SS-322.....there's definitely something
up forward, seems to be hanging right under the bow..... sonar device???? takes away
from the boat's lines to a point where it doesn't look "kosher." Wouldn't see it when moored or underway....
Comes from reliable sub artist....The same gent did a print of my destroyer, the BIG sonar dome was in correct place and to scale.
Bob Melley
Tincanman
1oldman
Posted 2007-11-14 11:32 PM (#9207 - in reply to #9190)
Subject: RE: Guppy II boats.......design question....

Some guppy boats had some chin mounted sonar. I don't know all the details but that they could not sit on the bottom like we could.
Bob Melley
Posted 2007-11-15 10:13 AM (#9220 - in reply to #9190)
Old Salt

Posts: 256

Subject: RE: Guppy II boats.......design question....

From one old man to another.......definitely a chin mounted sonar......sure looks out of place........had to be an issue when running on the surface, although the BIG sonar dome on my destroyer leader actually helped keep her bow from rising and slamming down.....some of the new Arleigh Burles have had "slamming" damage to their bows...The old John S. McCain held speed record in Pacific for awhile, so the big dome didn't slow us down, with four boilers on line and 1200 psi steam from the getgo, she was fast....in cooler water (at night) during a full power run, we did more than 43
knots....couldn't use much rudder, threw BIG rooster tail......The dome under the Guppy bow looks like it added almost
8 feet (up forward) to bottom of her keel depth......Can't really tell from the photo (bow on), BUT it was big.....
Tincanman
PatH
Posted 2007-11-15 3:55 PM (#9228 - in reply to #9190)


Great Sage of the Sea

Posts: 618

Location: Issaquah WA, USA
Subject: RE: Guppy II boats.......design question....

I believe all the GUPPYS had a chin mounted sonar based on the German Type XXI chin mount sonar design.

I also suspect the chin mount helped stablise the surface ride on the Guppies with their 'butterknife' bows. They were a wet ride in heavy weather anyway, but the chin mount probably helped mitigate the slicing through the waves somewhat.

For more information, visit http://indopedia.org/Greater_Underwater_Propulsion_Power_Program.html

Bob Melley
Posted 2007-11-16 7:55 AM (#9236 - in reply to #9190)
Old Salt

Posts: 256

Subject: RE: Guppy II boats.......design question....

Pat:
Thanks for your insight, so the chin sonar on Guppy helped stabilize the ride in a similar way that the big sonar dome on
newer DDs did........Interesting placement to say the least.....
thanks,
tincanman
Bob Melley
Posted 2007-11-18 7:52 AM (#9273 - in reply to #9190)
Old Salt

Posts: 256

Subject: RE: Guppy II boats.......design question....

Vic:
thanks for GUPPY info web site......I was very impressed by BLACKFIN in 1962....
Soon after that ride the first of the tear drop shaped smaller subs came to Pearl......we were away for months during all the tests at Johnson Island, and then went back to WESTPAC for another CV escort session so I never had the opportunity to hitch a ride on that new sub.....I'd really like to get a tour of the Virginia class, used this new sub in my novel THE STRAIT.....also used the ASDS....and SEALs.....to "get" bad guys, i.e., Islamic terrorists & PLAN.......
Tincanman
DaveyJ576
Posted 2007-11-18 11:12 AM (#9277 - in reply to #9190)
Mess cooking

Posts: 36

Subject: RE: Guppy II boats.......design question....

The dome on the bow of the Guppies was the "chin mount" for the BQR-2 passive sonar. It also appeared on some of the Fleet Snorkel boats, the Tangs, Darter, Grayback, and Growler. It was meant to smooth the flow of water around the circular sonar arrays and had nothing to do with the sea keeping qualities of the boats.

The later SSK's had a much larger dome for the BQR-4. This was mounted on the upper edge of the bow as opposed to a chin mount.

Dave Johnston

Darter (SS-576) 84-87
Bob Melley
Posted 2007-11-19 9:48 AM (#9306 - in reply to #9190)
Old Salt

Posts: 256

Subject: RE: Guppy II boats.......design question....

Thanks Dave.......In the silouette color plate of the USS Blackfin I purchased, the dome looks like a
square box affixed just below the chin......I'd never seen the sub out of water at Pearl in the early 1960's.
The newer DDs, DDGs and DLs had a big sonar dome up forward (SQS-5) as I recall......NOT on chin but aft
far enough to help with streamlining the ride.........that's why I raised the question in the first place......
Take a look at the new bow on the USS Virginia class Block III subs......new bow sonar and new vertical launch
system using the SSGN's MAC approach.....with six missiles vice seven.
Tincanman
DaveyJ576
Posted 2007-11-19 9:52 AM (#9308 - in reply to #9190)
Mess cooking

Posts: 36

Subject: RE: Guppy II boats.......design question....

The chin mount domes were actually rounded into a teardrop shape. They were vented to sea so that they were flooded all the time. The arrays had to be wet.

Dave Johnston
Bob Melley
Posted 2007-11-20 8:31 AM (#9336 - in reply to #9308)
Old Salt

Posts: 256

Subject: RE: Guppy II boats.......design question....

Big sonar domes on destroyers also "wet"........for same reason...
Cheers to all USNers who ever used them to play tag with the "other folks....."
Russians & Chinese......

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