Cruisers, Large (CB)

Index
As of 1 December 1944

Name No. Class Page
Alaska CB 1 CB 1 Class 19
Guam CB 2 CB 1 Class 19
Hawaii CB 3 CB 1 Class 119

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DATA PERIOD 1944-1945 CB 1
ENDURANCE AND RADIUS CHART FOR WAR STEADY STEAMING
MEAN DISPLACEMENT: TONS
Fuel in Thousands of Gallons
SHIPS IN CLASS:
CB 1-3

Chart: ENDURANCE AND RADIUS CHART FOR WAR STEADY STEAMING

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DATA PERIOD 1944-1945 CB 1 CLASS
Table I.--WAR LOGISTICS DATA FOR STEADY STEAMING
BASED ON RADIUS OIL*
SHIPS IN CLASS
CB 1-3

PROP. SPEED FUEL RATE ENDURANCE SPEED RADIUS SPEED RADIUS FUEL RATE WORK COLUMN
MEAN NORMAL RANGE DAILY
Mean displacement 33,650 tons† Mean displacement 29,650 tons Mean displacement 33,650 tons†
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)
R.P.M. Gal./hr. Gal./hr. Bbl./day Hours Day Knots Engine miles Knots Engine miles Gal./eng. mi.
100 1,379 1,224-1,546 788±34 818±9 34.1 12.9±0.1 10,680±270 12.8±0.1 10,470±260 107.7  
                13.0 10,400 108.4  
110 1,570 1,394-1,760 897±39 719±8 30.0 14.2±.2 10,340±270 14.0±.2 10,070±260 112.1  
                15.0 9,670 116.7  
120 1,788 1,587-2,004 1,022±44 631±8 26.3 15.4±.2 9,840±260 15.2±.2 9,590±250 117.6  
                16.0 9,260 121.9  
130 2,036 1,808-2,282 1,163±50 554±7 23.1 16.6±.2 9,330±250 16.4±.2 9,090±250 124.1  
                17.0 8,870 127.3  
140 2,318 2,058-2,598 1,325±57 487±7 20.3 17.9±.2 8,820±250 17.7±.2 8,620±250 131.0  
                18.0 8,480 133.2  
150 2,639 2,343-2,958 1,508±65 427±6 17.8 19.1±.3 8,270±250 18.9±.3 8,070±250 139.6  
                19.0 8,030 140.4  
                20.0 7,600 148.7  
160 3,004 2,667-3,367 1,717±74 376±6 15.7 20.4±.3 7,750±240 20.1±.3 7,560±240 149.5  
                21.0 7,160 157.8  
170 3,421 3,037-3,834 1,955±85 330±6 13.8 21.6±.3 7,210±240 21.3±.3 7,030±240 160.6  
                22.0 6,730 167.9  
180 3,895 3,458-4,365 2,226±97 290±5 12.1 22.9±.4 6,710±240 22.5±.4 6,520±240 173.1  
                23.0 6,310 178.9  
190 4,435 3,937-4,971 2,534±110 254±5 10.6 24.1±.4 6,220±230 23.7±.4 6,020±230 187.1  
                24.0 5,890 191.6  
200 5,050 4,483-5,660 2,886±125 223±5 9.3 25.2±.4 5,700±220 24.8±.4 5,530±220 203.6  
                25.0 5,450 206.9  
210 5,751 5,106-6,445 3,286±143 196±4 8.2 26.3±.4 5,230±190 25.9±.4 5,080±190 222.0  
                26.0 5,040 223.9  
220 6,549 5,814-7,340 3,742±162 172±4 7.2 27.4±.4 4,770±190 27.0±.4 4,640±190 242.6  
                28.0 4,280 263.3  
230 7,458 6,621-8,359 4,262±185 151±4 6.3 28.5±.4 4,360±190 28.1±4 4,240±190 265.4  
                29.0 3,910 289.2  
240 8,493 7,540-9,519 4,853±211 133±4 5.5 29.5±.5 3,980±190 29.1±.4 3,870±190 291.9  
                30.0 3,560 318.4  
250 9,673 8,588-10,841 5,527±240 117±4 4.9 30.5±.5 3,600±190 30.1±.5 3,520±190 321.4  
254 10,189 9,046-11,419 5,822±253 111±3 4.6 30.9±.5 3,460±160 30.5±.5 3,390±150 334.1

* See table V.
† Mean displacement during data period.
‡ Estimated speed at designed shaft horsepower ( s.h.p.).

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DATA PERIOD 1944-1945  
CB 1 CLASS
SHIPS IN CLASS:
CB 1-3

Table II.--WAR LOGISTICS DATA: UNDERWAY AVERAGES

Average speed Fuel rate Endurance*
R.P.M. Knots Bbl./day Days
138.4 17.5 1,453±310 18.5±1.3
* Based on radius oil; see table V.

Table III.--WAR LOGISTICS DATA: NOT UNDERWAY

Fuel rate Endurance*
Gal./hr. Bbl./day Days
355 203 132.4
*Based on radius oil; see table V.

Table IV.--PROPELLER SPECIFICATIONS

Note.--All underway data are based on the propellers specified below.
In the case of ships whose propellers do not conform to these specifications,
see discussion of table IV in Introduction.

In case of a propeller change see discussion of table IV in Introduction.

Number of propellers Number of blades Diameter Pitch
2 Inboard 4 14'4" 15'1"
2 Outboard 4 14'4" 15'7"

Table V.--FUEL CAPACITIES

Capacity Gallons Barrels Tons
"Full load" fuel oil capacity§ 1,020,745 24,303 3,685
Diesel oil capacity (95%) 107,388 2,557 342
Total: radius oil* 1,128,133 26,860 4,027
Additional fuel oil required to fill all tanks to 95% (emergency) 6,925 165 25
Total: maximum capacity (95%)† 1,135,058 27,025 4,052

Table IA.--WAR LOGISTICS DATA FOR STEADY STEAMING

BASED ON MAXIMUM CAPACITY (95%)

Note.--Fueling beyond the radius oil capacity increases radius at the expense of resistance
to underwater damage. This table is made available to the commander as a supplement to table I
for use when increased radius and decreased resistance to underwater damage are factors in a decision.

Speed Radius Endurance Fuel rate
Mean displacement 33,650 tons
Knots Engine miles Days Bbl./day
13 10,460 33.6 806
14 10,130 30.2 897
15 9,730 27.1 1,001
16 9,320 24.3 1,116
17 8,920 21.9 1,238
18 8,530 19.8 1,371
19 8,080 17.7 1,525
20 7,650 16.0 1,700
21 7,200 14.4 1,896
22 6,770 12.9 2,113
23 6,350 11.6 2,354
24 5,930 10.3 2,630
25 5,480 9.2 2,959
26 5,070 8.1 3,327
27 4,670 7.2 3,742
28 4,310 6.4 4,215
29 3,930 5.6 4,794
30 3,580 5.0 5,460
* See table V.

Table VI.--STEADY STEAMING MEAN FUEL RATE RATIOS*

Ship Average displacement Fuel rate ratio--ship: Class
100 R.P.M. 150 R.P.M. 200 R.P.M. 250 R.P.M.
  Tons Percent Percent Percent Percent
U.S.S. Alaska CB 1 33,800 96.1 98.5 101.0 103.5
U.S.S. Guam CB 2 33,500 103.9 101.5 99.0 96.5

* Table VI is used to adjust the class data in tables I and IA to individual ships.
The ratios were obtained by dividing the steady steaming mean fuel rates of the indicated ships
by the corresponding mean fuel rates given in column (2) of table I.

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Transcribed and formatted by Larry Jewell & Patrick Clancey, HyperWar Foundation