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PostPosted: Mon Nov 04, 2019 2:13 pm 
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Hello everyone.

I just started to build USS Missouri model 1/200 from GPM - polish paper models publisher and I'm looking for drawings for shell expansion or shell plating of the hull.
thanks for help
best regards
chris


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PostPosted: Mon Nov 04, 2019 8:44 pm 
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Fortunately shell expansion plans for the Iowa class is not too much more difficult to find than a pink unicorn, with wings.

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PostPosted: Wed Nov 06, 2019 8:55 pm 
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chazi wrote:
I just started to build USS Missouri model 1/200 from GPM - polish paper models publisher and I'm looking for drawings for shell expansion or shell plating of the hull.


I have been working on and off on putting together the shell plating data from various sources. Most of the blueprints I have are extremely difficult to read. I think there are eleven blueprints plus the mold loft data. Each one is about 40MB so its about a half GB. And then it has to be deciphered because most of it is hard to read.

This is some of my work in progress. I am still refining the XYZ coordinates. I have not started on the shell thicknesses and types of joints.

Attachment:
Screen Shot 2019-11-06 at 8.42.18 PM.png
Screen Shot 2019-11-06 at 8.42.18 PM.png [ 357.01 KiB | Viewed 680 times ]

Attachment:
Screen Shot 2019-11-06 at 8.52.35 PM.jpg
Screen Shot 2019-11-06 at 8.52.35 PM.jpg [ 269.86 KiB | Viewed 680 times ]


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PostPosted: Sat Nov 09, 2019 2:48 pm 
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Can anyone point me to pictures of stowed accommodation ladders on an WWII era major US warship?

Missouri seems to carry two accommodation ladders on board, stowed lying on their sides and flipped on one edge against the superstructure when not in use, I believe the upper and lower platforms for the ladders are detached and stowed separately. Are the railings/ma ropes also detached?

Another question, are the angle of the steps on the accommodation ladders fixed? Or do they pivot to allow the step to remain horizontal if the lower part of the accommodation ladders is pulled up or down depending on the ship’s draft?

If they are pivoted, do they lie flat when the ladders are stowed?

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PostPosted: Sat Nov 09, 2019 3:18 pm 
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I'll have to look at my photos of the fwd accommodation ladder, stbd side against the wardroom area bulkhead. It looks as I recall as if the "steps" rotate and store flat as well as the railings. I'll look for the photos. Aft I recall seeing a photo somewhere with the accommodation laddes stowed awarthships aft of turret three.


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PostPosted: Sat Nov 09, 2019 3:57 pm 
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One accommodation ladder is stowed against wardroom bulkhead on starboard side, the other is stowed against the aft end of the superstructure on the port side, where the superstructure tapers towards the aft 16” turret.

One pair of upper and lower platforms, and a bail is also stowed against the aft superstructure, on starboard side opposite the accommodation ladder. I assume these are for the aft accommodation ladder. I am not sure where their counterparts for the forward accommodation ladders are stowed.

The leadsman’s platforms were stowed against startboard side toward, just behind B turret barbette.

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PostPosted: Sun Nov 10, 2019 8:40 am 
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This is a picture I took on board Missouri. You can see that the steps are folded flat.

Larry


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PostPosted: Sun Nov 10, 2019 10:04 pm 
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Also note that the "railing" folds flat when stowed as well.


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PostPosted: Thu Nov 14, 2019 5:47 pm 
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Just to add a bit more "use" information, and this is coming from working in the Trades. Generally speaking, there is the basic use/consumption of 2 oxygen cylinders to 1 acetylene cylinder. Even moreso when the use of a cutting torch/brass-axe is prevalent.

Also, the actual design of the acetylene bottle is considerably different than the rest, because it is at 'low pressure' compared to the tall ones that hold gasses. Acetylene is stored as a liquid, in a bottle that is filled with concrete. The porosity of the concrete allows the liquid to 'gas-off' slowly in a controlled manner, so that it is safer. Compared with the typical 'tall bottle' that holds gasses, those gasses are generally filled to ~2,200 psi. Some can be well over 4,000 psi.

Acetylene is generally stored in a bottle in its liquid state under 220 psi.

Hope that helps, and explains a bit why the acetylene bottles are physically different than the gas bottles. Another minor point to add, acetylene bottles are made out of mild-carbon steel, whereas the higher pressure 'gas' bottles are made out of armor steel.

(and, now that I realize that I was replying to a topic that appears to have been on page 199, my apologies to the masses for the completely "off-topic-at-the-moment" post) But, unless it bothers someone, I'll leave it up there simply in my attempt to contribute.


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PostPosted: Fri Nov 15, 2019 7:29 pm 
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That explains why the Acetylene bottles are so heavy.

James


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PostPosted: Fri Nov 15, 2019 9:06 pm 
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Sean_the_Nailer, higher pressure 'gas' bottles are not made out of armor steel(AR-Abrasion Resistant). check the links below.
Acetylene tanks http://www.hse.gov.uk/cdg/pdf/standard/da2a.pdf
Oxygen tanks manufactured
https://bizfluent.com/how-does-5022450- ... -made.html
http://www.madehow.com/Volume-7/Oxygen-Tank.html


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PostPosted: Sat Nov 16, 2019 12:47 pm 
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Sean_the_Nailer wrote:
Generally speaking, there is the basic use/consumption of 2 oxygen cylinders to 1 acetylene cylinder.


I'm surprised that it is just 2 to 1. I would have expected 5:2 from chemistry

5 (02) + 2 (HCCH) ==> 2 (H2O) + 4(CO2)


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PostPosted: Sat Nov 16, 2019 1:36 pm 
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The chemistry gets a little more mathematically complex as I suspect each bottle of O2 and Acetylene probably do not contain an equal number of molecules.


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PostPosted: Sat Nov 16, 2019 6:48 pm 
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Fliger747 wrote:
The chemistry gets a little more mathematically complex as I suspect each bottle of O2 and Acetylene probably do not contain an equal number of molecules.


If they have the same volume and pressure they should be approximately the same.

PV = nRT


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PostPosted: Sat Nov 16, 2019 7:29 pm 
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not the same size & pressure as a friend of mine had that setup with oxygen cylinder twice as tall as Acetylene.


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PostPosted: Sat Nov 16, 2019 7:46 pm 
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A mole of O2 weighs 15.9 g and a mole of Acetylene about 26.6 grams. When we combine them an equal volume of O2 will weigh less. If we combine them by weight it will take a larger volume of O2 to achieve the same desired ratio.


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PostPosted: Sat Nov 16, 2019 8:15 pm 
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Fliger747 wrote:
A mole of O2 weighs 15.9 g and a mole of Acetylene about 26.6 grams. When we combine them an equal volume of O2 will weigh less. If we combine them by weight it will take a larger volume of O2 to achieve the same desired ratio.


But they are combined by moles; not by weight.


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PostPosted: Sat Nov 16, 2019 8:45 pm 
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Exactly...


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PostPosted: Fri Nov 22, 2019 11:15 am 
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Fliger747 wrote:
Exactly...


The volume of a mole of a gas under the same temperature and pressure is the same. Thus it should take 5 O2 Cylinders for every 2 C2H2 and that the contents of the C2H2 cylinders will weigh 2-1/2 times that of O2 when the cylinders are have the same volume and pressure.


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PostPosted: Sat Nov 23, 2019 10:53 am 
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bigjimslade wrote:
This is the largest the forum will allow:

Attachment:
001 copy.tif


Do you have other files of the booklet of general plans ?


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