Cold War Database 1946-1979 Platform Requests

[e2204588]

Il-2m3's gun should be 23mm x 2 + 7.62mm x 2 forward and 12.7mm x 1 rear
Loadout:
Could Il-2 carry FAB-500 x 2 ? It is larger than its max payload(600kg). And RS-132 rocket is missing.
http://en.wikipedia.org/wiki/Ilyushin_Il-2

Il-10 has same problem.
http://en.wikipedia.org/wiki/Ilyushin_Il-10

Po-2 was used in Korean war. Maybe need to add it?
http://en.wikipedia.org/wiki/Polikarpov_Po-2

[e2204588]

M4A3E8's 12.7mm/50 M2 MG has AirPOK 65%.

[TheOriginalOverlord]

Ok..first shot at this..

for BOTH CWDB and DB3000:
Argentine Daggers and Mirages should NOT have ATA refuel capability..

loadout requests:
A-4B need a 3x Mk82 LDGP/2xDT as Standard War Loadout NOT the 6xMk82s. Also change title from A-4B Caza to just A-4B.
A-4C need a 2x Mk82 and a 4x Mk82 both with 2xDTs as Standard War Loadout.
A-4Q need a 2x Mk82 and a 4x Mk82 *snakeye* with 2x DT as Standard War loadout. The Navy A-4Qs were the ONLY A-4s to use snakeye 500lbs bombs.


Question:
On the P-2H Neptune...when loading A.244 torps the ready time is 1 hour..... however doing the same loadout but only adding 10xzuni rockets the arm time goes to "10" hours...is that correct?

[.Sirius]

Noted

[hellfish6]

USS Sealion modified as an APSS/LPSS transport submarine. Using it for a Cuban Missile Crisis scenario.

http://en.wikipedia.org/wiki/USS_Sealion_(SS-315)

A year and one-half later, however, Sealion, along with Perch, was designated for conversion to a troop carrier, and in April 1948, she entered the San Francisco Naval Shipyard for the eight-months conversion. During that period, her torpedo tubes and forward engines were removed, and her forward engine room and forward and after torpedo rooms were converted to berth 123 troops. The forward engine room and after torpedo room were designed for alternative use as cargo space. The wardroom was redesigned for use as an operating room; the beam aft of the conning tower was extended, and a large watertight cylindrical chamber was installed abaft the conning tower to store amphibious landing equipment—including a tracked landing vehicle (LVT).

[.Sirius]

Noted

ORIGINAL: hellfish6

USS Sealion modified as an APSS/LPSS transport submarine. Using it for a Cuban Missile Crisis scenario.

http://en.wikipedia.org/wiki/USS_Sealion_(SS-315)

A year and one-half later, however, Sealion, along with Perch, was designated for conversion to a troop carrier, and in April 1948, she entered the San Francisco Naval Shipyard for the eight-months conversion. During that period, her torpedo tubes and forward engines were removed, and her forward engine room and forward and after torpedo rooms were converted to berth 123 troops. The forward engine room and after torpedo room were designed for alternative use as cargo space. The wardroom was redesigned for use as an operating room; the beam aft of the conning tower was extended, and a large watertight cylindrical chamber was installed abaft the conning tower to store amphibious landing equipment—including a tracked landing vehicle (LVT).

[scottb613]

Hi Folks,

Just a suggestion - US Skipjacks ( S-Girls ) were known as the hotrods of the submarine fleet - they max out at 28 knots in the CWDB - I'm pretty sure they could hit 32 to 33 knots on a good day...


Regards,
Scott

[.Sirius]

Hi I got from various sources "Official 20 kts" yeah ok I think not "31 kts" theoretical normally SSN speeds are classified so I could proberly bump up to 30kts at a push

ORIGINAL: scottb613

Hi Folks,

Just a suggestion - US Skipjacks ( S-Girls ) were known as the hotrods of the submarine fleet - they max out at 28 knots in the CWDB - I'm pretty sure they could hit 32 to 33 knots on a good day...


Regards,
Scott

[scottb613]

ORIGINAL: .Sirius

Hi I got from various sources "Official 20 kts" yeah ok I think not "31 kts" theoretical normally SSN speeds are classified so I could proberly bump up to 30kts at a push

ORIGINAL: scottb613

Hi Folks,
s
Just a suggestion - US Skipjacks ( S-Girls ) were known as the hotrods of the submarine fleet - they max out at 28 knots in the CWDB - I'm pretty sure they could hit 32 to 33 knots on a good day...


Regards,
Scott

Hi .Sirius,

Of course I was merely quoting the Wikipedia article...


http://en.m.wikipedia.org/wiki/Skipjack_class_submarine

Regards,
Scott

[scottb613]

Hi Paul,

Also - I posted this over on the DB3000 thread - I only recently noted there are two different database managers... I updated the CWDB as well... The updates are in my Dropbox link below... The file contains a batch file to update the description and photos automatically - or - you can just move the files manually if you prefer...

Hi CV60,

https://www.dropbox.com/s/obmerm43toqc9zy/SCO-DBupd.zip

Try this - if so inclined... I cleaned up some entries with new pix and created descriptions for the US Skipjack, US Permit, and US Sturgeon class submarines as a test... I also prefer my records with a single clean picture 1024 wide by around 500 high or so - of the boats at sea - so I removed all the old images...

The downloaded file has a batch file to do all the install work for you - removes the old images and saves them in case you don't like mine... Just unzip and place the included folder in your DB directory - then run the batch... One click install... Don't run twice without saving your "save" folders - if you want them - as they will overwrite... You can remove my folder once it's run...

I did this for the units in both the DB3000 and the CWDB as well...

I'm not sure why some of the DB entries are for a specific unit such as the Archerfish - so I didn't touch those - only the dated class entries...

Feedback most welcome...

Regards,
Scott

< Message edited by scottb613 -- 8/14/2014 11:17:53 PM >

(in reply to CV60)

Regards,
Scott

[Ogier]

With the recent fiftieth anniversary of the Gulf of Tonkin incident and the already existing Command scenario in mind, I humbly request a mid-sixties version of the non FRAM-modified Allen M. Sumner class as an additional platform for the Command CWDB. They show marked differences compared to the 1953 non FRAM version currently available in the CWDB.

And as it is probably the most famous non FRAM Sumner (and a scenario already exists for it), I would propose to model the new DB entry after the 1964 USS Maddox (DD-731) -- United States (Navy), 1964-1972 (thereafter to China Taiwan as “Po Yang”).

In the current version of the Tonkin Gulf scenario (Miguel Molinas “Gulf of Tonkin incident”), the USS Maddox is represented by a FRAM II Allen M. Sumner class. But the Maddox never got a standard FRAM II refit. She rather received a more limited refit, which left her with a modernized sensor and weapon fit, but without a lot of the typical FRAM II characteristics (like air facilities). The final (?) refit was right before its fateful 1964 cruise and resulted in a configuration currently not covered by the existing DB entries.

So, as far as I could figure it out, the 1964-1972 Maddox characteristics would be something like this (compared to the existing DB entries):

General Data: like existing DB entries (Captain Ogier mentions 288 as war time complement, BuPers complement as 234 and 1964 WestPac manning level as 193, so one of these values could be substituted for crew number…)

Properties: no HIFR (like 1953 Sumner)

Air Facilities: none (like 1953 Sumner)

Sensors/EW:
Air Search: AN/SPS-40 (unlike FRAM II DB entry (15 FRAM II Sumners did have AN/SPS-40 though), unlike 1953 Sumner)
Surface Search: AN/SPS-10B (like FRAM II)
Forward (main) Director: Mk 37 GFCS with Mk 25 radar (Mk 25) (like 1953 Sumner)
Aft Director: AN/SPG-35 (Mk 56 GFCD) (like 1953 Sumner)
Sonar: AN/SQS-32A (unlike 1953 Sumner, unlike FRAM II (as far as I understand it, AN/SQS-32 is an upgrade (RDT capable) of the 14 kHz version (mod.4) of AN/SQS-4))
ESM: some sort of AN/WLR-1 ? (like FRAM II – but with just one AS-571/SLR antenna assembly???)
ECM: maybe AN/ULQ-6, can’t identify ECM on pictures though…
(Remark: no VDS)

Mounts:
2x Mk11 Hedgehog ASW Mortar - forward firing; left/right of bridge
3x 127mm/38 Mk32 Twin - 2x twin mount forward (superfiring), 1x twin mount aft
2x 76mm/50 Mk33 Twin without on mount AN/SPG-34 fc – 1x centerline aft, 1x on aft deck house, facing aft, offset to port (unlike FRAM II, unlike 1953 Sumner)
2x 324mm Mk32 TT Triple – 1x port, 1x starboard (like FRAM II)
1x Mk9 Depth Charge Rack - stern
1x T Mk 6 Fanfare (like FRAM II) - stern
(Remark: no 76mm/50 singles, no on mount radar directors, no depth Charge Projectors)

Magazines:
Mk44 [External Tubes] (like FRAM II)
Mk11 Hedgehog ASW Mortar (like FRAM II)
Signatures:
Like existing DB entries
Comms/Datalinks:
Like existing DB entries
Propulsion:
Like existing DB entries

Note: Configurations of non FRAM Sumners during the sixties vary quite considerably over time and between ships. So the above configuration is just one amongst a rather bewildering amount of possible sensor/weapon configurations. But for the most part it should be rather representative. One notable exception: Maddox might have been the only non FRAM Sumner with AN/SPS-40 (instead of AN/SPS-37).

Some sources:
Ogier: USS Maddox “July-August DESOTO Patrol…” dated 24 Aug.
Ogier: USS Maddox "Report of Action, Gulf of Tonkin, 2 August 1964" dated 24 Aug.
Amico, Pittenger: “A Brief History of Active Sonar”, Aquatic Mammals 2009
Hanyok: “Spartans in Darkness: American SIGINT and the Indochina War, 1945-1975”
Moïse: “Tonkin Gulf And the Escalation of the Vietnam War”
Various Jane’s Fighting Ships editions
Various photographs available online
Various trawls through the web

[Ogier]

And some more:

Currently I’m fiddling around with some 1964 Tonkin Gulf situations (DESOTO, OPLAN 34A MAROPS, PIERCE ARROW, what ifs…), so I would really appreciate it if some of the following could be considered for upcoming CWDB versions:

Suggested corrections for existing CWDB platforms - North-Vietnamese /Soviet/Chicom Ships:

TK P-4 [Pr.123K]

Construction: Currently the P-4 has “Glass Reinforced Polyester” as a property. I’m not sure about the deckhouse (which might very well be the relevant part for this property?) and such, but at least the P-4 hulls were aluminum.

Speed: Currently the speeds for the P-4 are 5/20/35/55. It’s just a minor difference, but NVN sources gave a top speed of 52 kts (The engine could be run at top speed for only one hour.) and an economical speed of 35 knots, while mentioning that the boat could maintain 45 knots in a sea state 3 sea.

Fuel: The CWDB-entry has the P-4 carry 1286 kg of Diesel fuel. NVN sources mention six tanks with a combined fuel capacity of 3 tons (3000 kg). Side note: Fuel seems to have been something called “Nazout”, a “…more volatile form of diesel”. Whatever that means…

Comms: As far as I understand it, the current DB entries for Comms gear are somewhat generic, so I’m not sure if fiddling with them is appropriate. In reality however the NV P-4 had far less capable communication equipment: VHF Radio (unsecure): P-609; range 5 km (2.7 nm); 4 channels. HF Radio (unsecure): P-607; range 500 km (270 nm). Additionally introduced in summer 1966: UHF/VHF Radio (unsecure): P-108; range 20 km (10.8 nm).

DC: The current P-4 CWDB entries feature two DC racks (2x 4 DC). The P-4 had none! They had 4 smoke pots mounted on the stern (2 each side of the 14.5mm twin mount; lit in pairs; burn approximately 10 minutes).

Torpedoes: The P-4 carried two single 450mm TT, not the larger 533mm TT! The torpedoes carried were Soviet 45-36 AN Straight Runner (until summer 1966 North-Vietnam had received 72 45-36 from the Soviets). However, currently there seems to be no 450 mm TT mount in the CWDB and no Weapon entry for the 45-36 torpedo in the CWDB, so both needs to be added. Mount would be ROF 1/capacity 1 and NVN sources give these characteristics for the carried 450mm torpedoes: 45-36 AN; air steam; 450mm; speed 42 knots; range 5,000 meters (2.7 nm); variable set running depth 1 to 14 meters; gyro control 0° - shop set; 250 kg TNT (550 lbs); impact-inertia exploder; fuel type unknown; shell stainless steel; air tank heavy stainless steel.

Type 55A Shantou/Swatow

Crew: purely cosmetic, but complement might have been much larger than 17. NVN source said the crew was approximately 30 strong, with the following positions known: CO, XO, six man 37mm gun crew (2x 3), two 14.5mm gunners, 6-7 enginemen and an unknown number of 37mm ammo handlers (probably eight total - four for each 37mm mount).

Speed: Current platforms of this type seem to be much faster than they should be. Their current DB speeds are 5/35/45/50kts, while contemporary NVN sources attribute them with a designed maximum speed of only 28kts and economical speed of 15-18kts! Additionally there are supporting reports from OPLAN 34A-Missions indicating that “they” (“Nasty”-Type PC with 40 knots top speed) could easily outrun pursuing contacts which were later identified as “Swatow”-type patrol craft. On these occasions, the “Swatow” contacts were tracked at speeds of 20 to 25 kts.

Request for new CWDB platform – North-Vietnamese Aircraft:

An-2 Colt (rocket armed version):

new platform/loadout An-2: As North Vietnam used such birds a few times (amongst other things, they tried to interdict South Vietnamese/US coastal raiders), I request a North Vietnamese Version of the An-2 armed with two UB-16-57 rocket pods (16x S-5 57mm unguided rocket each) - or just this additional loadout option for the existing Soviet An-2 platform.

new weapon/warhead S-5 57mm Rocket: Currently there’s just the shaped charge variant S-5K in the DB, which probably wasn’t used by Vietnam (?). So maybe the base version S-5 with a 1.16 kg GP HE warhead could be added for the CWDB?

Some sources:
“NVN PT Boat Exploitation Team Report(s) July 1966”, available at the Virtual Vietnam Archive.
“Description of South Vietnamese Operations against North Vietnamese islands and bases during the period 30 July to 6 August 1964”, available at the Virtual Vietnam Archive

Thanks!

[mikmykWS]

I've updated our worklist. Thanks for posting these in!

Mike

[Broncepulido]

"Nazout" is very probably a corruption (In French Vietnamese? or in a transliteration/translation?) of the French Word of common usage "Mazout" (Heat oil?) : http://fr.wikipedia.org/wiki/Fioul (and thanks for your fine researches, Ogier!)

[.Sirius]

Hi Noted will update

ORIGINAL: Ogier

With the recent fiftieth anniversary of the Gulf of Tonkin incident and the already existing Command scenario in mind, I humbly request a mid-sixties version of the non FRAM-modified Allen M. Sumner class as an additional platform for the Command CWDB. They show marked differences compared to the 1953 non FRAM version currently available in the CWDB.

And as it is probably the most famous non FRAM Sumner (and a scenario already exists for it), I would propose to model the new DB entry after the 1964 USS Maddox (DD-731) -- United States (Navy), 1964-1972 (thereafter to China Taiwan as “Po Yang”).

In the current version of the Tonkin Gulf scenario (Miguel Molinas “Gulf of Tonkin incident”), the USS Maddox is represented by a FRAM II Allen M. Sumner class. But the Maddox never got a standard FRAM II refit. She rather received a more limited refit, which left her with a modernized sensor and weapon fit, but without a lot of the typical FRAM II characteristics (like air facilities). The final (?) refit was right before its fateful 1964 cruise and resulted in a configuration currently not covered by the existing DB entries.

So, as far as I could figure it out, the 1964-1972 Maddox characteristics would be something like this (compared to the existing DB entries):

General Data: like existing DB entries (Captain Ogier mentions 288 as war time complement, BuPers complement as 234 and 1964 WestPac manning level as 193, so one of these values could be substituted for crew number…)

Properties: no HIFR (like 1953 Sumner)

Air Facilities: none (like 1953 Sumner)

Sensors/EW:
Air Search: AN/SPS-40 (unlike FRAM II DB entry (15 FRAM II Sumners did have AN/SPS-40 though), unlike 1953 Sumner)
Surface Search: AN/SPS-10B (like FRAM II)
Forward (main) Director: Mk 37 GFCS with Mk 25 radar (Mk 25) (like 1953 Sumner)
Aft Director: AN/SPG-35 (Mk 56 GFCD) (like 1953 Sumner)
Sonar: AN/SQS-32A (unlike 1953 Sumner, unlike FRAM II (as far as I understand it, AN/SQS-32 is an upgrade (RDT capable) of the 14 kHz version (mod.4) of AN/SQS-4))
ESM: some sort of AN/WLR-1 ? (like FRAM II – but with just one AS-571/SLR antenna assembly???)
ECM: maybe AN/ULQ-6, can’t identify ECM on pictures though…
(Remark: no VDS)

Mounts:
2x Mk11 Hedgehog ASW Mortar - forward firing; left/right of bridge
3x 127mm/38 Mk32 Twin - 2x twin mount forward (superfiring), 1x twin mount aft
2x 76mm/50 Mk33 Twin without on mount AN/SPG-34 fc – 1x centerline aft, 1x on aft deck house, facing aft, offset to port (unlike FRAM II, unlike 1953 Sumner)
2x 324mm Mk32 TT Triple – 1x port, 1x starboard (like FRAM II)
1x Mk9 Depth Charge Rack - stern
1x T Mk 6 Fanfare (like FRAM II) - stern
(Remark: no 76mm/50 singles, no on mount radar directors, no depth Charge Projectors)

Magazines:
Mk44 [External Tubes] (like FRAM II)
Mk11 Hedgehog ASW Mortar (like FRAM II)
Signatures:
Like existing DB entries
Comms/Datalinks:
Like existing DB entries
Propulsion:
Like existing DB entries

Note: Configurations of non FRAM Sumners during the sixties vary quite considerably over time and between ships. So the above configuration is just one amongst a rather bewildering amount of possible sensor/weapon configurations. But for the most part it should be rather representative. One notable exception: Maddox might have been the only non FRAM Sumner with AN/SPS-40 (instead of AN/SPS-37).

Some sources:
Ogier: USS Maddox “July-August DESOTO Patrol…” dated 24 Aug.
Ogier: USS Maddox "Report of Action, Gulf of Tonkin, 2 August 1964" dated 24 Aug.
Amico, Pittenger: “A Brief History of Active Sonar”, Aquatic Mammals 2009
Hanyok: “Spartans in Darkness: American SIGINT and the Indochina War, 1945-1975”
Moïse: “Tonkin Gulf And the Escalation of the Vietnam War”
Various Jane’s Fighting Ships editions
Various photographs available online
Various trawls through the web

[.Sirius]

Noted will update.

ORIGINAL: Ogier

And some more:

Currently I’m fiddling around with some 1964 Tonkin Gulf situations (DESOTO, OPLAN 34A MAROPS, PIERCE ARROW, what ifs…), so I would really appreciate it if some of the following could be considered for upcoming CWDB versions:

Suggested corrections for existing CWDB platforms - North-Vietnamese /Soviet/Chicom Ships:

TK P-4 [Pr.123K]

Construction: Currently the P-4 has “Glass Reinforced Polyester” as a property. I’m not sure about the deckhouse (which might very well be the relevant part for this property?) and such, but at least the P-4 hulls were aluminum.

Speed: Currently the speeds for the P-4 are 5/20/35/55. It’s just a minor difference, but NVN sources gave a top speed of 52 kts (The engine could be run at top speed for only one hour.) and an economical speed of 35 knots, while mentioning that the boat could maintain 45 knots in a sea state 3 sea.

Fuel: The CWDB-entry has the P-4 carry 1286 kg of Diesel fuel. NVN sources mention six tanks with a combined fuel capacity of 3 tons (3000 kg). Side note: Fuel seems to have been something called “Nazout”, a “…more volatile form of diesel”. Whatever that means…

Comms: As far as I understand it, the current DB entries for Comms gear are somewhat generic, so I’m not sure if fiddling with them is appropriate. In reality however the NV P-4 had far less capable communication equipment: VHF Radio (unsecure): P-609; range 5 km (2.7 nm); 4 channels. HF Radio (unsecure): P-607; range 500 km (270 nm). Additionally introduced in summer 1966: UHF/VHF Radio (unsecure): P-108; range 20 km (10.8 nm).

DC: The current P-4 CWDB entries feature two DC racks (2x 4 DC). The P-4 had none! They had 4 smoke pots mounted on the stern (2 each side of the 14.5mm twin mount; lit in pairs; burn approximately 10 minutes).

Torpedoes: The P-4 carried two single 450mm TT, not the larger 533mm TT! The torpedoes carried were Soviet 45-36 AN Straight Runner (until summer 1966 North-Vietnam had received 72 45-36 from the Soviets). However, currently there seems to be no 450 mm TT mount in the CWDB and no Weapon entry for the 45-36 torpedo in the CWDB, so both needs to be added. Mount would be ROF 1/capacity 1 and NVN sources give these characteristics for the carried 450mm torpedoes: 45-36 AN; air steam; 450mm; speed 42 knots; range 5,000 meters (2.7 nm); variable set running depth 1 to 14 meters; gyro control 0° - shop set; 250 kg TNT (550 lbs); impact-inertia exploder; fuel type unknown; shell stainless steel; air tank heavy stainless steel.

Type 55A Shantou/Swatow

Crew: purely cosmetic, but complement might have been much larger than 17. NVN source said the crew was approximately 30 strong, with the following positions known: CO, XO, six man 37mm gun crew (2x 3), two 14.5mm gunners, 6-7 enginemen and an unknown number of 37mm ammo handlers (probably eight total - four for each 37mm mount).

Speed: Current platforms of this type seem to be much faster than they should be. Their current DB speeds are 5/35/45/50kts, while contemporary NVN sources attribute them with a designed maximum speed of only 28kts and economical speed of 15-18kts! Additionally there are supporting reports from OPLAN 34A-Missions indicating that “they” (“Nasty”-Type PC with 40 knots top speed) could easily outrun pursuing contacts which were later identified as “Swatow”-type patrol craft. On these occasions, the “Swatow” contacts were tracked at speeds of 20 to 25 kts.

Request for new CWDB platform – North-Vietnamese Aircraft:

An-2 Colt (rocket armed version):

new platform/loadout An-2: As North Vietnam used such birds a few times (amongst other things, they tried to interdict South Vietnamese/US coastal raiders), I request a North Vietnamese Version of the An-2 armed with two UB-16-57 rocket pods (16x S-5 57mm unguided rocket each) - or just this additional loadout option for the existing Soviet An-2 platform.

new weapon/warhead S-5 57mm Rocket: Currently there’s just the shaped charge variant S-5K in the DB, which probably wasn’t used by Vietnam (?). So maybe the base version S-5 with a 1.16 kg GP HE warhead could be added for the CWDB?

Some sources:
“NVN PT Boat Exploitation Team Report(s) July 1966”, available at the Virtual Vietnam Archive.
“Description of South Vietnamese Operations against North Vietnamese islands and bases during the period 30 July to 6 August 1964”, available at the Virtual Vietnam Archive

Thanks!

[Broncepulido]

Skipjack

About the Skipjack speeds (speeds and test deeps are still classified):
I did some research a few years ago.
The answer is very probably:
Skipjack-class speed 1959-1968: 33 knots.
Skipjack-class speed 1963-1991: 29 knots.
Some hints: with ever increasing displacement, the Skipjack, Tresher/Permit and Sturgeon have the same S5W nuclear power plant.
Some sources:
Notes of autor Jim Christley"informed guesses" in the four page of Osprey's New Vanguard number 138 "US Nuclear Submarines - the fast attack", 2007: speed 15/29 (clearly after the screw replacement), test depth 700 ft.
On Norman Friedman's "US Submarines from 1946", Naval Institute Press 1994: submarine data page 243, speed 15/29, test depth 700 ft (probably Christley get his data here).
On Norman Polmar "Cold War Submarines", Brassey's 2004: page 135 "She achieved just under 33 knots submerged with her original, five-bladed propeller, this was 15 knots faster than the previous Skate-class SSNs", page 136 "However,the Skipjack had minimal quieting features. A later change in propeller - to a seven-blade, slower turning propeller to reduce cavitation as well as shaft noise - reduced her speed" (I don't remember now how I get the 1961 date for screw change). Table on page 146: test depth 700 ft, speed 33 knots (with note about speed reduction after screw change).

I think my initial deduction (1961) of the propeller change from the old five-blades ones on the Skipjack-class boats in 1961 is derived of the in service date of January 1961 of the first Thresher-class boat, with seven-blade propeller. Now I see it probably was changed first as earlier date on the Skipjack 1962-1963 overhaul, and the last propeller changed was probably that of Sculpin on her 1968-1969 overhaul.

[Broncepulido]

Possible dates of Skipjack-class submarines screw changed based on overhaul dates:
Skipjack:
From Wikipedia entry: "In January 1962, Skipjack operated out of Key West, Florida, for two weeks before entering the Portsmouth Naval Shipyard in Maine for extensive overhaul, lasting four and one-half months."
Scamp:
From Wikipedia entry: "Scamp entered Mare Island Naval Shipyard again in January 1965 for extensive modification. In June 1966 after the installation of the SUBSAFE package and overhaul, she left Mare Island and returned to training cruises i In the San Diego operating area."
Scorpion:
From Wikipedia entry: "From June 1963 – May 1964, she interrupted operations for an overhaul at Charleston."
Sculpin:
From Wikipedia entry: "On 31 December, Sculpin was notified that she was due for drydock and overhaul at Puget Sound, and she sailed for that destination on 2 January 1968. This was Sculpin’s first major overhaul and refueling since commissioning, seven years before, and she was in drydock from 30 January 1968 to 22 January 1969."
Shark:
From Wikipedia entry: "On 25 June 1964, she sailed to Charleston, South Carolina, for her first shipyard overhaul which lasted until 7 June 1965. "
Snook:
From Wikipedia entry: "On 1 February 1963, the submarine entered Mare Island Naval Shipyard in Vallejo, California, for extensive improvements of her hull. After leaving Mare Island on 23 August,"

[Randomizer]

Can we please see the Skate class (SSN-578) for the CWDB please. Thanks

-C

[Broncepulido]

My results on the Skate-class research some time ago. For me the most distictive point is an increment in speed after the reactor power increase probably on the earlier overhauls (from 6600shp (Conway's) or 7300 shp ("Cold War Submarines") S3W in SSN-578 and SSN-583 and the same reactor with different arrangement S4W in SSN-579 and SSN-584).
Skate-class submerged speed 12/1957-1962: 18 knots (this value is reflected in more "serious" books, but I think is the original speed value, it can reflect the 6600 shp power).
Skate-class submerged speed 1963-6/1989: 22 knots (value reflected for years on many books, or as "20+ knots", it can reflect the 7300 shp power).

Some sources:
Notes of autor Jim Christley"informed guesses" in the four page of Osprey's New Vanguard number 138 "US Nuclear Submarines - the fast attack", 2007: speed 15/18 (clearly previously to the reactor replacement), test depth 700 ft. Also with Mk14, Mk16 and Mk37 torpedoes originally (perhaps also Mk27, Mk35 and Mk45 ASTOR (1963-1976).
On Norman Friedman's "US Submarines from 1945", Naval Institute Press 1994: submarine data page 243, speed 15,5/18, test depth 700 ft (probably Christley get his data here).
6x533mm Mk56 bow tubes with 18 long torpedoes.
2x533mm Mk57 stern tubes (sometimes calles "countermeasures tubes") with 4 short torpedoes (as Mk37).
Original sonars: active SQS-4 Mod 1, passive BQR-2B (with BQS-4, added 1963?), later added mine-detection sonar BQS-8, also with SS-2 surface search radar (later BPS-12), torpedo Warner QXB-3 to be replaced with WLR-2 (very probably also DUUG-1 Velox, employed on all the US SSNs to Sturgeon-class inclusive), BLR-1, AS-371 and WLR-3 DF system (ESM), and BRA-34 radio mast (page 128).
On Norman Polmar "Cold War Submarines", Brassey's 2004: page 70, the same speed values of 15,5/18 knots and 700 ft deep.

On navsource.org http://www.navsource.org/archives/08/08578.htm 23 knots surfaced and 18+ knots submerged!

About the speed increase is only my "informed guess", but I will persist on the trail ...