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ť Forum Category: PT Boats of WWII
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ť Forum Name: PT Boats - General
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ť Topic: Shore (or Tender) Electrical Connection
http://www.ptboatforum.com/cgi-bin/MB2/netboardr.cgi?cid=101&fid=102&tid=3777

When moored to a shore installation or to a tender did an Elco boat receive electrical power from the shore or tender, saving the boat's generator?

If so, where was the connection made?

Thank you!

Jeff

Posted By: JBG327 | Posted on: Feb 15, 2015 - 8:22pm
Total Posts: 74 | Joined: Sep 29, 2012 - 2:40pm

As far as location goes, the Elco drawings are spotty regarding shore power. This is what I was able to dig up:

The location for PT 103-114 at bulkhead 47, a few feet forward of the aft end of the day cabin:

[image]http://www.pt103.com/images/asst/DwgElco80_ShorePowerConnectionPT103_114.jpg[/image]

The deck plug for PT 103-196:

[image]http://www.pt103.com/images/asst/DwgElco80_ShorePowerDeckConnectionPT103_196.jpg[/image]

The connection instructions for PT 565-624:

[image]http://www.pt103.com/images/asst/DwgElco80_ShorePowerConnectionBoxInstructionsPT565_624.jpg[/image]

This looks like the (covered) plug, on PT 613:

[image]http://www.pt103.com/images/ptpics/HN-SN-98-07197_small.jpg[/image]

Posted By: Jeff D | Posted on: Feb 16, 2015 - 8:04am
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am

Jeff;
Hmm, to me that looks like it might be a fresh water fill for tank below decks. being that this is a later series boat, could it be somewhere else? My personal experience, we always had Shore Power connections mounted to a vertical bulkhead type surface above decks, as the cables usually ran down the bulkhead to below decks.

While we have this photo up, what is that "cable connection" coming up through the deck next to the torpedo rack? were these later modified with electric release motor?

Take care,
TED

Posted By: TED WALTHER | Posted on: Feb 16, 2015 - 8:29am
Total Posts: 3059 | Joined: Oct 16, 2006 - 7:42am

Thank you!

Jeff

Posted By: JBG327 | Posted on: Feb 16, 2015 - 1:11pm
Total Posts: 74 | Joined: Sep 29, 2012 - 2:40pm

You're welcome Jeff.

I dunno Ted, it's in about the same location as shown in the 103-114 drawing but that don't mean it's a deck plate for shore power hookup. None of the deck arrangement drawings list it, or any water fills.

I've no clue as to what that cable going to the rack is. It goes into a device on the rack:

[image]http://www.pt103.com/images/ptpics/PT_613_Cable_Zoom.jpg[/image]

Posted By: Jeff D | Posted on: Feb 17, 2015 - 2:15am
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am

I did some digging Ted, PT 565-624 did indeed move the potable water fill but it was from the chart room floor to the bridge deck just aft of the chart house. The 3 fresh water tanks for the engine cooling system were small and part of a closed system like a cars. The engine plumbing system drawings don't show any deck fills. I'd guess the photo shows the deck plate for shore power hookup.

Posted By: Jeff D | Posted on: Feb 17, 2015 - 3:46am
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am

It looks like it is a hydraulic line Ted, for remote launching:

[image]http://www.pt103.com/images/asst/Torpedo_Roll_Off_Rack_Patent.jpg[/image]

Posted By: Jeff D | Posted on: Feb 17, 2015 - 4:32am
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am

No I think it is a pushbutton operated solenoid release to launch the torpedo. The pushbuttons to launch the torpedo were mounted near the helm. The 24vdc cable leads to a plug on the deck and can be disconnected. I believe that the hydraulic thing not invented until post war. Jerry

Jerry Gilmartin
PT658 Crewman
Portland OR

Posted By: Jerry Gilmartin | Posted on: Feb 17, 2015 - 9:30am
Total Posts: 1472 | Joined: Oct 8, 2006 - 11:16pm

That's a post war (1952 I think) photo of a boat sent to Korea Jerry, so that would line up with what you say.

Posted By: Jeff D | Posted on: Feb 17, 2015 - 11:10am
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am

Here's a closeup of the hydraulic ram from the patent, looks like a dead ringer for what's seen in the photo:

[image]http://www.pt103.com/images/asst/Torpedo_Roll_Off_Rack_Patent_Hydraulic_Unit.jpg[/image]

Posted By: Jeff D | Posted on: Feb 17, 2015 - 11:34am
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am

What is so cool about this forum. I ask question and the discussion results in more knowledge shared never heard of hydraulic racks.

Posted By: JBG327 | Posted on: Feb 17, 2015 - 12:00pm
Total Posts: 74 | Joined: Sep 29, 2012 - 2:40pm

Jerry;
Are the Electric motors on PT 658? I thought they would have to be a little larger for more torque to release the torpedo.
Take care,
TED

Posted By: TED WALTHER | Posted on: Feb 17, 2015 - 1:06pm
Total Posts: 3059 | Joined: Oct 16, 2006 - 7:42am

I agree Jeff, I wish I could retain even 10% of it...

It looks like the deck fitting seen on the ROK boat is most likely a fuel tank suction vent, with 2 more on the port side (1 for each tank) as seen on PT 588:

[image]http://www.pt103.com/images/ptpics/PT_588_Cropped.jpg[/image]

Posted By: Jeff D | Posted on: Feb 17, 2015 - 2:24pm
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am

Here's what the PT 565-612 deck fitting looks like, pretty much just like the images show. For some reason PTs 613-624 aren't listed in any drawings regarding these. And no other boat series show any tank vents leading to the deck:

[image]http://www.pt103.com/images/asst/DwgElco80_FuelSystemDeckVentPT565_612_900.jpg[/image]

Posted By: Jeff D | Posted on: Feb 17, 2015 - 3:26pm
Total Posts: 2200 | Joined: Dec 21, 2006 - 1:30am