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 Author  Topic: 20MM Dual Gun
Frank J Andruss Sr

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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 16, 2009 - 6:25am
I saw a photograph of a nice dual 20MM Cannon set up on one of our WWII Subs. I was wondering if any of the PT Boats carried such a weapon. I do not recall seing this type set up, but that does not mean they did not have them. Maybe it was a weight issue........


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TGConnelly

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Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 16, 2009 - 6:50am
No Frank,

NOT that I know of ................

BUT knowing me? I'd be wrong.


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Frank J Andruss Sr

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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 16, 2009 - 11:19am
I wonder why that weapon did not find favor. Seems that with 60 rounds each, it would have put out a ton of lead on enemy planes or surface targets. Like I mentioned in the earlier post, it might have had something to do with extra weight, because it would make since that to support the twin 20MM you would need the heavy Pedestal mount.


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BobPic

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Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 17, 2009 - 5:43am
Frank; I saw lots of PT boats and never saw one with twin 20mm cannons. I recall a study made about the advisabolity of installing twin 40mm's, but weight ruled them out pretty quickly. I suspect that it was more of a "crowd"reason. The foredeck was a beehive of activity during the use of both 20mm and the 37mm. Loaders were constantly rushing about. It would have been chaos with added activity. (one man's opinion)


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Frank J Andruss Sr

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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 17, 2009 - 6:50am
Bob

It certainly makes good since. I am sure that if the boats could have handled heavier weapons, they would have used them. The sheer weight of a twin 40MM in the stern might have sunk the darn boat, so I am sure the heavier Pedestal mount for a twin 20MM and the fact of a crowded deck all played a role.


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BobPic

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Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 17, 2009 - 7:04am
I remember the jokes around when they were experimenting with the twin 40's. It was decided they could install twin 40mm's if they removed the engines or fuel tanks. Also I remember that the crew "banned" the skipper from forward of the chart house during general quarters because of the busy conditions. Remember the foredeck of a PT was crowned, sloping toward the edges. No rail of any kind. Deck was painted and slick, especially when wet (all the time). Adding two more loaders would have complicated things.


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  Drew Cook

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Drew Cook  Posted on: Jan 17, 2009 - 1:19pm
"Sloping toward the edges...no rail of any kind..."

Huh?

Are the flat PT boat foredecks I've looked at, in hundreds of photos, for 45 years, optical illusions?

What about the toe rail(s)?

I don't get it.


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QM

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Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 17, 2009 - 2:30pm
I seem to remember that at least one boat had a twin 20 mm in a turret In place of the usual twin 50. My search for information has been unsuccessful.

I don't remember ever slipping on a wet deck. However, there was a rail about two inches high which was handy for tripping someone and dumping the victim overboard. I do not know if that ever happened.

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BobPic

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Post a Reply To This Topic    Reply With Quotes     Edit Message   Posted on: Jan 18, 2009 - 8:17am
I didn't mean the deck was rounded but it was sloped toward the edges just to shed the water. I wouldn't have been so conscious of it except we had to repair it and shape the boards. Our deck was slick when wet. The 2" rails were really scuppers and did indeed trip people. We never lost anyone overboard in combat situations but we had a torpedoe man who went overboard several times


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alross2

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of alross2   Send Email To alross2 Posted on: Jan 18, 2009 - 3:51pm
Camber (transverse deck curvature) is a common feature on just about any ship or boat. It is often quite subtle. Here's a section through the forecastle of an 80' ELCO showing the slight curve of the deck.

Al Ross




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