PT Boat Forum


Moderated by: Dick, Jeff D

The PT Boat Forum ª PT Boats of WWII ª  PT Boats - General

Next Page | Page: 1 of 2

Back to Topic Index Page 195 | Replies: 10 | Pages: [1] 2

 Author  Topic: torpedo tubes
victorkchun

New Member
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 24, 2009 - 1:37pm
First of all I like to thank all of you helping me to solve the mystery of
the function of louvres, part of the Elcoplane System.
Now to my otherr questions:
As you all know that the torpedo tubes of the early Elco and Higgins are of different design. Can someone explain, in layman's language, the
two different systems, and why not the navy used one system to
simplyfy manufacturing and maintenance. Is one system better than the other?
Victor

Victor K Chun

Total Posts: | Joined: Unregistered | IP Logged

Frank J Andruss Sr

TOP BOSS
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Frank J Andruss Sr   Send Email To Frank J Andruss Sr Posted on: Jan 24, 2009 - 1:53pm
If I am not mistaken, Higgins came up with their own design torpedo tubes using compressed air to propel the torpedoes. Other Companies, such as Elco and Huckins Yacht Corporation used the Black Powder charged Tubes. In the cae of Elco and Huckins, they simply used what was available at the time, while Higigins experimented with the compressed air tubes. I am not sure if Elco did any testing on the air driven tubes, although I sem to remember a photo or two somwhere showing the boats with that type system. Of course, the roll of racks pretty much changed things for all the boats.


Total Posts: 3315 | Joined: Oct 9, 2006 - 6:09am | IP Logged

Frank J Andruss Sr

TOP BOSS
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Frank J Andruss Sr   Send Email To Frank J Andruss Sr Posted on: Jan 24, 2009 - 2:06pm
I forgot to mention that the black powder charge was an impulse cartridge that was inserted into the firing mechanism, using a special 3 inch case roughly 13 inches long. I think the Higgins boats caried an air compresser to refill the air resevoirs. Jerry Gilmartin can shed more light on them then I can.


Total Posts: 3315 | Joined: Oct 9, 2006 - 6:09am | IP Logged

TGConnelly

New Member
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 25, 2009 - 7:56am
Frank

Those Elco boats that had the compressed air fired tubes were the boats exported to the Soviets. They perferred them because their boats operated in extreme cold and the compressed air tended to operate better in those conditions.

Garth


Total Posts: | Joined: Unregistered | IP Logged

Frank J Andruss Sr

TOP BOSS
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Frank J Andruss Sr   Send Email To Frank J Andruss Sr Posted on: Jan 25, 2009 - 9:59am
Thanks Garth:

I often wonder why Elco did noit switch to the Air Compressed Tube to rid themselfs of the problems associated with the B.P charged tubes they had, unless the shortage of tubes was the problem. Often many of the boats had their tubes installed after.


Total Posts: 3315 | Joined: Oct 9, 2006 - 6:09am | IP Logged

Will Day

TOP BOSS
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Will Day   Send Email To Will Day Posted on: Jan 25, 2009 - 2:42pm
You notice the Elco tubes in "They Were Expendable" were air-setups...

Will

Total Posts: 1954 | Joined: Oct 8, 2006 - 4:19pm | IP Logged

  Jerry Gilmartin

TOP BOSS
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jerry Gilmartin   Send Email To Jerry Gilmartin Posted on: Jan 25, 2009 - 3:50pm
Hi Victor,
I love your excellent PT Boats reference book by the way. It is definitely one of the more authorative sources of information about US PT Boats that I have seen. We even used one of the drawings in it of the torpedo aiming device to create a mockup to mount on the PT658.

Anyway, on the subject of torpedo tubes, what I know of the Higgins design is that they were installed on numerous Higgins boats and changed designs to accomodate the Mark 13 torpedo also. The original tubes had the curved air "Impulse Chamber" and was designated the
"21 inch Mark 19 Mod 4" tube. I am certain that below decks in the engine room was a torpedo tube heater as well as an air compressor, I suppose they could recharge the impulse chamber after firing the torpedo using the air compressor. These had the curved air chamber mounted on top of the tube. The other tube designed for the later Mark 13 torpedo had two straight parallel air chambers mounted beside one another on the top and were shorter. I got a lot of this info from looking at photos posted under "Higgins Factory Photos" on Gene Kirklands excellent site "PT King" http://www.geocities.com/pt_king/
as well as the Louisiana Digital Library Higgins Industries Collection
http://louisdl.louislibraries.org/

There are several drawings such as "Torpedo tube extractor control lines, heater and air compressor arrangement " that show some of these details. I hope this helps. Jerry

Jerry Gilmartin

Total Posts: 1310 | Joined: Oct 8, 2006 - 11:16pm | IP Logged

Jeff D

Moderator
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jeff D   Send Email To Jeff D Posted on: Jan 26, 2009 - 12:23am
Frank, the Osprey book mentions that the ELCO 21" x 20' 8" Mk 18 Mod 1 tube was provided by ELCO but subcontracted out. This caused delays and some boats were turned over to the Navy for shakedown without the tubes installed. They were later returned and the tubes installed. Larger 22.5" tubes were developed but only installed on about 20 boats before the rollover racks were made standard.

Google books has an excerpt:

http://books.google.com/books?id=X1AvTqSg2QsC&printsec=frontcover



Total Posts: 2071 | Joined: Dec 21, 2006 - 1:30am | IP Logged

TGConnelly

New Member
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 26, 2009 - 6:24am
Frank,

I cannot answer that for you, as I do not know.

Garth


Total Posts: | Joined: Unregistered | IP Logged

alross2

TOP BOSS
  

    
Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of alross2   Send Email To alross2 Posted on: Jan 26, 2009 - 7:14am
>...the Osprey book mentions that the ELCO 21" x 20' 8" Mk 18 Mod 1 tube was provided by ELCO but subcontracted out. ..<

You might want to confirm this with other sources. This particular book is the most error-filled book on PTs I have ever read.

Al Ross





Total Posts: 935 | Joined: Oct 30, 2006 - 8:19pm | IP Logged

Next Page

Pages: [1] 2


Lock Topic

 

Forum Legend

New Member

Reply to topic

More than 25 posts | Full Member

Reply to topic with quoted message

More than 50 posts | Advanced Member

Edit Message

More than 150 posts | MASTER

View profile

More than 300 posts | TOP BOSS

Email member