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 Gene Slover |
USS Worchester |
Lead | |
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Posts: 6445 ( 4-Jul-2008 03:27:37) |
This is a new book by Mark A. Janowski whose Father John A. Janowski, Jr., served aboard her in the "T"
division.
http://www.eugeneleeslover.com/AMMUNITION/USS-WORCESTER.html The Worchester and Roanoke were the only 2 of 4 proposed to be finished. |
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Gene Slover |
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Posts: 6446 ( 4-Jul-2008 03:46:36) |
Some 10 designs came and went and the final design was past the no 10 design.
The Worchester and Roanoke are 2 very interesting ships all around and in particular the fire control and main battery guns. The surface main battery director is a modified MK 34 director with a Mark 13 surface fire control radar. There are no rangefinders in these directors. The strange arrangement of the forward main battery director just barely shows itself above turret 6"/3 while the aft main battery director is high where you would expect both directors to be. There is a main battery plotting room and a secondary main battery plot room. There is a Mark 8 rangekeeper in each plotting room for use with the Main Battery directors for surface fire or shore bombardment. |
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Gene Slover |
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Posts: 6447 ( 4-Jul-2008 04:16:43) |
Mounted on the turret face between the guns of all turrets is a Mark 27 Radar Antenna. This is called a projectile ranging radar and thats exactly what its for
to accurately measure projectile range of the 2 guns in that turret. These radar do not track the projectile not do they measure projectile IV. They measure
the range of the projectile at different gun ranges.
The guns in each turret are fired one are a time and usually 5 to ten rounds are fired at say 15,000 and 20,000 yd ranges. The radar measures the range of each round fired and the total is averaged to get the average range for that gun at those ranges. Then all ranges are compared between all guns to see if there is 1 or 2 guns firing longer or shorter than the other guns. The 6"/47 gun has only a slightly shorter barrel life than a 5"/38. If you discover a barrel or 2 that is firing shorter than the other barrels then you either do not fire those guns for a while or fire them less often. This then will allow the other barrels to wear faster than these 2 barrels and eventualy all guns will be fireing at the same range. By the same token if you find a barrel or 2 that is firing longer than the other barrels you then fire those barrels more ofter to wear them down so that all guns are firing at the same range. The 6"/47 gun elevation receiver regulators do not have the IV correction in them that the 16"/45 and 16"/50 gun elevation receiver regulators had so you actually fire the guns more or less to equal barrel wear between all guns so that they will all fire at the same range. |
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Gene Slover |
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Posts: 6448 ( 4-Jul-2008 04:36:44) |
You do the same to 5"/38's on any ship as outlined above so that all guns are firing at the same range.
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BOBC 59 |
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Posts: 1222 ( 4-Jul-2008 04:37:53) |
Hi Ya all
I imagine some dialoque is going to occur on the U.S.S.Worchester but the correct pronounciation isU.S.S.Woosta not Wor'chester Being a died in the wool New Englander I just had to inject that little tid bit thats where we have clam chowda,n we pahk oura cahas n go to Havaahd Colledge n drink bottled beaha also home of the great lobsta NUFF SAID BOB PS Happy Birthday America !!!!!!
For those that fought for it,Freedom has a taste and meaning ,The protected will never know.
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Gene Slover |
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Posts: 6449 ( 4-Jul-2008 04:49:04) |
The 2 centerline Mark 37 directors, one above the pilot house and one aft are the anti-aircraft directors for the 6"/47 guns.
The radar is a Mark 25 and in each of the 2 main battery plot rooms there is 1 Mark 1A computer with ballistic cams cut for the 6"/47 guns. For AA fire the 6"/47 turrets are switched from the Mark 34 surface system to the Mark 37 AA systems. The Mark 37 systems can fire surface as well but the "B" scope is better for spotting in the Mark 13 radar although the Mark 25 has a very good "B" scope as well that we used for spotting with no problems. As far as I know these 2 ships are the only ones the USN ever had that had 2 completely different Fire Control Systems to control 1 gun system. I know of no other USN ship that had this configuration. The Mark 37 gun directors have 15ft rangefinders.
Last Edited By: Gene Slover
4-Jul-2008 05:01:05.
Edited 1 times.
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Gene Slover |
7F2. Six-inch 47-caliber triple-gun turrets | ||
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Posts: 6450 ( 4-Jul-2008 04:52:57) |
Light cruisers of the Brooklyn, Cleveland, and Fargo classes are equipped with single-purpose 6-inch turrets of similar designs. The gun has a monobloc,
radially expanded barrel with housing and wedge-type sliding breechblock. Ammunition is supplied to the gun room through 1 projectile hoist and 1 powder hoist
for each gun, and is transferred by the gun crew from the top of the hoist into a loading tray in the gun slide. Although the maximum elevation of the guns is
60 degrees, loading must be accomplished at an elevation of 22° or less because of the limitations of the ammunition-loading mechanisms and the empty-case
ejection system. Gun compartment features generally resemble the smaller semiautomatic guns, such as the 5"/38 caliber which is described in the next
chapter.
The gun compartment is not divided into separate gun rooms, because the inherently greater safety of case ammunition renders such minute flametight subdivision unnecessary. The rear part of the gun house, as in major-caliber turrets, includes the turret officer's booth with rangefinder and equipment for local control of fire. The pointer's and sight checker's stations are located outboard of the left gun, the trainer's and sight setter's stations outboard of the right gun, neither station being separated from the gun compartment by bulkheads. |
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Gene Slover |
G. 6”/47 Dual-Purpose Gun and Turret | ||
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Posts: 6451 ( 4-Jul-2008 04:58:59) |
7G1. General
The main battery of light cruisers of the CL-144 (Worcester) class comprises the newest design now in service of 6-inch guns and turrets. There are 12 guns in six 2-gun turrets, all of them capable of rapid fire against either air or surface targets. 7G6. Ammunition hoists Each gun is served by three ammunition hoists: one powder hoist, and two projectile hoists (one projectile hoist from each of the two projectile flats). The powder hoist delivers the powder cartridge directly to the gun slide completely automatically, regardless of the movement of the gun in elevation, without manhandling of the case, and without requiring that the gun be brought to a specific loading position. The projectile hoists bring the projectiles to a point adjacent to the slide, from which they are manually transferred to the gun slide. Projectiles can be loaded at any gun elevation. All six ammunition hoists are generally similar. All are of the continuous type in which an endless-chain conveyor, operating intermittently, automatically starts hoisting every time the hoist lower end is loaded, until the hoist is full. Each hoisting cycle lifts the projectile or powder case one stage. The hoists can also be reversed for lowering ammunition. The powder hoist lower end is fitted with a flameproof scuttle for extra safety. The upper end terminates in a power-driven cradle which automatically loads the propelling charges into the gun slide. 7G7. Fire control and power drive equipment The 6"/47 dual-purpose turret is designed to deal with air as well as surface targets. It is capable of a maximum surface range of over 25,000 yards, and can reach targets at an altitude of over 51,000 feet when at its maximum elevation of 78°. There is no optical rangefinder in these turrets, but they are equipped with telescopic prismatic sights, periscopes, and sight-setting equipment, as well as radar and computer equipment. The turret is driven in train and the guns in elevation by electric-hydraulic power drives controlled by receiver-regulators. The fuze setters on the gun slides are also operated by receiver-regulators. There are six designated types of turret control: |
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Gene Slover |
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Posts: 6452 ( 4-Jul-2008 11:09:15) |
The Worchester and Roanoke were fast ships capable of staying with the fast carriers.
The 6"/47's had a 20 round rate of fire and longer range than the 5"/38 gun and so were are would have been very good in AA defense. The ships were also very good sea keeping vessels. |
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emc |
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Posts: 3910 ( 4-Jul-2008 14:44:02) |
BOBC 59 wrote: Once upon a time, my brother was living in Ohio. My parents went out to visit him (I didn't; I wasn't going to use my vacation to hang around
with my parents)
He lived on a street spelled "Worcester," which my father asked a local for directions. Being a New Englander, he knew the correct pronunciation ("wooster," we're from Connecticut, not Eastern Massachusetts). The local answered, "no such street." My father said something to effect of "damn, we came all the way from Connecticut...." The local then said something like "Back east, eh? How do you spell that?" My father spelled it out. The local said "you mean Wor-ces-ter." Regional differences in American English live!
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