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PostPosted: Fri May 29, 2020 8:00 am 
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Vepr157 wrote:
Yes, the five-bladed propellers had a diameter of 15'0". There were several seven-bladed propellers, some with 15'0" and some 12'4". If you want more information, look up the following numbers up on https://fsg-20-ship-marine.parttarget.com/

SSN588-203-2113387
SSN588-203-2113387PC1
SSN588-203-2500463
SSN588-203-2540029
SSN588-203-2478480
SSN588-203-4352714PC1
SSN588-203-4252643PC1

Note that these are for the Scamp "class" (i.e. every submarine in the Skipjack class except the Skipjack herself), which had different propulsion machinery. However, I doubt the Skipjack's propeller was any different.


I guess this begs a question...it appears one could order these screws. What else uses this design? Or, why would this be in the public domain?


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PostPosted: Fri May 29, 2020 8:44 am 
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Woodstock74 wrote:
I guess this begs a question...it appears one could order these screws. What else uses this design? Or, why would this be in the public domain?


It's a site intended for the companies that supply the Navy, so you would not be able to order anything off that website. Besides, they were made by the Navy's own propeller foundry in Philadelphia, so it's not like you can order them from a private company. Propellers are very specifically made. Even if they have essentially identical dimensions as propellers for other classes, like the seven-bladed propellers for the 598 and 616-class SSBNs, they will be marked as suitable for only a single class.

As to why it's in the public domain, this stuff isn't classified. All propellers up to the Sturgeon class have declassified exterior surfaces (the interior is still classified), so you will find that Los Angeles and Ohio class propellers are listed, but there is much less information in the listings.

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PostPosted: Fri May 29, 2020 9:08 am 
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Vepr157 wrote:
Woodstock74 wrote:
I guess this begs a question...it appears one could order these screws. What else uses this design? Or, why would this be in the public domain?


It's a site intended for the companies that supply the Navy, so you would not be able to order anything off that website. Besides, they were made by the Navy's own propeller foundry in Philadelphia, so it's not like you can order them from a private company. Propellers are very specifically made. Even if they have essentially identical dimensions as propellers for other classes, like the seven-bladed propellers for the 598 and 616-class SSBNs, they will be marked as suitable for only a single class.

As to why it's in the public domain, this stuff isn't classified. All propellers up to the Sturgeon class have declassified exterior surfaces (the interior is still classified), so you will find that Los Angeles and Ohio class propellers are listed, but there is much less information in the listings.


Wasn't planning on ordering one...but it IS tempting... :cool_1:

Not surprised they are bespoke, just confused why they'd bother listing parts for scrapped sub classes. Granted, it would make sense if they carry over to current. But the screws clearly do not...


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PostPosted: Fri May 29, 2020 12:13 pm 
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Woodstock74 wrote:
Wasn't planning on ordering one...but it IS tempting... :cool_1:

Not surprised they are bespoke, just confused why they'd bother listing parts for scrapped sub classes. Granted, it would make sense if they carry over to current. But the screws clearly do not...


I think it's just some generic catalog that has info carried over from old parts. There are even listings for the WWII-era Fleet Boat propellers (which were still manufactured post-WWII for some of the GUPPYs, Fleet Snorkels, etc.).

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PostPosted: Sun Jul 05, 2020 12:48 pm 
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Never mind, think I found the answer!


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PostPosted: Tue Oct 05, 2021 2:15 pm 
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I'm Building the Moebius Skipjack in 1/72, and I'm planning to portray her as one of the Skips late in their life, probably USS Shark or USS Sculpin. So that means at least to my knowledge, a Towed array, and some of the extra blisters on her deck (PUFFs maybe?) and possibly a 7 bladed screw? Although I'm not sure if all the Skipjacks got 7 blades later or not.

I'm planning to either 3d print or make out of plasticard the Box that reels the towed array, or if before or later in their lives it was just a tube that ran further up the hull and got reeled inside like a ballast tank or something, I have another aluminum rod I can run up the hull if that's the case. I'm also thinking I'll probably 3d print the extra bumps and pods on deck, but I can't find any plans that show them or a definitive explanation of what they are.

Image

Image

Image


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PostPosted: Tue Oct 05, 2021 4:40 pm 
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Yes, the Skipjacks were refitted with 7 blade J screws. See photo in dry dock, below


Attachments:
Skipjack drydock.jpg
Skipjack drydock.jpg [ 132.16 KiB | Viewed 528 times ]

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PostPosted: Wed Oct 06, 2021 1:14 am 
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The box had a hinged cover that exposed a set of rollers so that the array could be fed down through the tube. The array was stored wrapped around a set of portable stanchions on the diesel exhaust spine. I presume the tube that runs forward from the box is for the cable and the winch/drum is somewhere in a ballast tank. I'm not sure what the little dome aft is for, although it definitely wasn't PUFFs. Perhaps it was a later form of GNATS, which you will more commonly see as a football-shaped fairing on a short strut.

Jacob

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PostPosted: Wed Oct 06, 2021 8:50 am 
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Ok, thank you very much! And is GNATS the thing that was mounted on USS Cavalla's bow? Cause its shaped exactly like what you described.


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PostPosted: Wed Oct 06, 2021 10:45 pm 
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razgrizbsg27 wrote:
Ok, thank you very much! And is GNATS the thing that was mounted on USS Cavalla's bow? Cause its shaped exactly like what you described.


GNATS looked like this:

Image

The "wart" on the bow of the Cavalla (and Sturgeon and apparently one 594) was a fairing over the mechanically-steered, high-frequency component of the BQH-4 sonar array. The other outboard component was a thick-line towed array, the predecessor to the TB-16.

Jacob

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PostPosted: Thu Oct 07, 2021 9:09 am 
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Quote:
And is GNATs the thing that was mounted on USS Cavallas’s bow?

Do you mean the large installation on Cavalla, as pictured here:
https://www.pinterest.com/pin/334673816031009573/
https://www.history.navy.mil/bin/imageDownload?image=/content/dam/nhhc/our-collections/photography/images/USN%201150000/USN%201154162.tif&rendition=cq5dam.web.1280.1280.jpeg

I know someone who was aboard when this was on bow. I’m not exactly sure of the function. It was only there for a limited period.

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"Project Azorian: The CIA and the Raising of the K-129" Book
https://www.usni.org/press/books/project-azorian


Last edited by Tom Dougherty on Fri Oct 08, 2021 12:41 pm, edited 1 time in total.

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PostPosted: Fri Oct 08, 2021 10:35 am 
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Yes exactly, I never knew what that was, I just guessed it might have been GNATs based on the description of it.


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PostPosted: Fri Aug 12, 2022 2:45 pm 
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Can someone who has the Moebius 1/72 Skipjack kit reach out to me (direct message me), I need a dimension.


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PostPosted: Fri Aug 12, 2022 5:15 pm 
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PM out.

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