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At random: On August 17, 1958, the USS SKATE circumnavigated the globe in about fifty minutes. The SKATE was at a radius of about two miles from the North Pole at the time, and the distance traveled in the circumnavigation was about twelve miles.

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Corabelle

Posted 2009-06-18 4:51 PM (#27799)

COMSUBBBS

Posts: 2561

Location: Rapid City, SD

Subject: Sonar

Elmer talks about active and passive sonar. He also mentions JP sonar. Which one is that? And what's the name of the other sonar? And what's the difference between the two? Is his kind of sonar still in use? Like he often said, "Well, you know - it's been over sixty years ago."

Thanks in advance.

It's been stormin' all day today. I thought maybe Gracie would be afraid of the thunder. Oh, no. It makes her angry and she talks back to it. Thunder. Bark. Thunder. Bark! Thunder. BARK!

Cora

Edited by Corabelle 2009-06-18 4:54 PM

Bear

Posted 2009-06-18 6:20 PM (#27807 - in reply to #27799)

Great Sage of the Sea

Posts: 781

Location: Port Orchard WA

Subject: RE: Sonar

http://www.zerobeat.net/submarine/sub-sonar.html Try this link

JP SONAR;

The JP Sonar gear, passive only, was located in the Forward Torpedo Room and its associated hydrophone was located directly overhead on the main deck. The hydrophone was coupled to the unit by means of a shaft, gear and a crank handle.

Rotation of the hydrophone was strictly by man power. With the hydrophone being located topside it allowed the submarine to "hear" when sitting on the ocean floor.

The sonar operators were trained to fire a special acoustic torpedo with this JP gear.

Late during WWII the JP sonar was replaced with the JT version. This used a larger hydrophone and the training mechanism was improved from the manual operation to a electrical/hydraulic system.

Edited by Bear 2009-06-18 6:21 PM

Flapper

Posted 2009-06-19 1:06 PM (#27829 - in reply to #27799)

Master and Commander

Posts: 1107

Location: Tucson AZ

Subject: RE: Sonar

JP sonar control, below deck in the Fwd Torp Rm ...

And, up topside, the hydrophone head ...

For context, here's a shot of Bowfin, off Mare Island, in 1944 ...

More info (possibly more than you want!) can be found at Submarine Sonar Operator's Manual.

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