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Topic review - Calling all USS Iowa class (BB-61) fans
Author Message
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
Exactly...
Post Posted: Sat Nov 16, 2019 8:45 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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.
Post Posted: Sat Nov 16, 2019 8:15 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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.
Post Posted: Sat Nov 16, 2019 7:46 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
not the same size & pressure as a friend of mine had that setup with oxygen cylinder twice as tall as Acetylene.
Post Posted: Sat Nov 16, 2019 7:29 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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
Post Posted: Sat Nov 16, 2019 6:48 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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.
Post Posted: Sat Nov 16, 2019 1:36 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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)
Post Posted: Sat Nov 16, 2019 12:47 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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
Post Posted: Fri Nov 15, 2019 9:06 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
That explains why the Acetylene bottles are so heavy.

James
Post Posted: Fri Nov 15, 2019 7:29 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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.
Post Posted: Thu Nov 14, 2019 5:47 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
Also note that the "railing" folds flat when stowed as well.
Post Posted: Sun Nov 10, 2019 10:04 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
This is a picture I took on board Missouri. You can see that the steps are folded flat.

Larry


Attachments:
Missouri Ladder.png
Missouri Ladder.png [ 229.02 KiB | Viewed 286 times ]
Post Posted: Sun Nov 10, 2019 8:40 am
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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.
Post Posted: Sat Nov 09, 2019 3:57 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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.
Post Posted: Sat Nov 09, 2019 3:18 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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?
Post Posted: Sat Nov 09, 2019 2:48 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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 380 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 380 times ]
Post Posted: Wed Nov 06, 2019 8:55 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
Fortunately shell expansion plans for the Iowa class is not too much more difficult to find than a pink unicorn, with wings.
Post Posted: Mon Nov 04, 2019 8:44 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
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
Post Posted: Mon Nov 04, 2019 2:13 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
I made mine out of some really fine I beam I found somewhere (1: 192).
Post Posted: Sun Nov 03, 2019 7:00 pm
  Post subject:  Re: Calling all USS Iowa class (BB-61) fans  Reply with quote
Chuck wrote:
Quote:
1. The real I-Beam stanchions are actually quite thick and beefy. On the real ship the outboard face of the stanchions are nearly at the deck edge, while the inboard face of the stanchions are aligned with the inboard face of the chocks. In other works the stanchions are nearly as thick as the chocks. Folded PE stanchions provided by Pontos and Eduard are still too thin, unless you use two PE stanchions glued back to back for each stanchion. Otherwise either the outboard dace of the stanchions are too far inboard, or the railings can not align with the backs of the chocks.


Here is a photo of BB-64 (museum) which shows the larger collapsible stanchion and its relative position in the waterway:
Attachment:
BB64 Deck Stanchion Detail.jpg
BB64 Deck Stanchion Detail.jpg [ 258.58 KiB | Viewed 382 times ]

If it were feasible to have 3D printed stanchions provided, that would be the ultimate way to go. However, using the Pontos brass PE stanchions in place of the kit version will not really improve how these fit or look (Pontos is what I ended up using). This is a crap shoot and you probably won't like the odds or results.

As for the chocks, I used the kit supplied augmented with the Pontos brass posts and put them where the deck was stamped for them to go. I also used a custom ordered Pontos teak deck set (which I had collaborated with them in order to produce) and made no changes to the chock location as it was originally designed for use with the kit plastic main deck. A judgement call, I guess; something you have to really wonder if it's worth messing with in the overall scheme of things.

If I were to be working on the 1:200 kit now, YES! I would try to find someone to make 3D correctly shaped and printed stanchions. Chock locations and custom designed chocks? Don't know about that one!

Hope this helps,

Hank
Post Posted: Sun Nov 03, 2019 5:42 pm

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