Characteristics of Naval Guns
on
Cleveland Class Ships
| Gun Characteristic |
6"/47 Gun |
5"/38 Gun |
40mm/56 Gun |
20mm/70 Gun |
| Designation | 6"/47
Mark 16 |
5"/38
Mark 12 |
40
mm/56 Mk 1, Mk 2 and M1 |
20
mm/70 Marks 2, 3 and 4 |
| Date Of Design
|
1932 | About 1932 |
1941 |
About 1939 |
| Date
In Service |
1937 |
1934 |
1942 |
1941
(Mk2) |
| Gun Weight
|
13,000 lbs. |
3,990 lbs. Without Breech |
Mk1: About
1,150 lbs. (3) Mk2: ( " ) M1: 1036.5 lbs. (4) |
150 lbs. (with
breech) 46 lbs. (without breech) |
| Gun
Length oa. |
300
in. |
223.8
in. |
148.8
in. |
87
in. |
| Bore Length
|
282.3 in. |
190 in. |
88.6 in. |
55.1 in. |
| Rifling
Length |
238.3
in. |
157.2
in. |
75.85
in. |
49.1
in. |
| Grooves |
N/A |
N/A |
Mk1 & Mk2:
(16), 0.0236" D x 0.220" W M1: (16), 0.0225" D x 0.220" W |
(9) 0.015"
D x 0.205" W |
| Lands
|
N/A |
N/A |
0.0892
in. |
N/A |
| Twist |
Uniform RH,
1 in 25 |
Uniform RH,
1 in 30 |
Increasing
RH, 1 in 45 to 1 in 30 |
Uniform RH,
1 in 36 |
| Chamber
Volume |
1,470
cu. in. |
654
cu. in. |
28.3
cu. in. |
2.127
cu. in. |
| Rate Of Fire
Rds./Min. |
8 - 10 |
W/o integral
hoists: 12 -15 With integral hoists: 15 -22 |
120 per barrel
nominal, 140-160 when horizontal (gravity assist) |
450 (Cyclic), 250-320 (Practical) |
| Working
Pressure |
18.5
tons/sq. inch |
N/A |
N/A |
N/A |
| Approx. Barrel
Life |
750 - 1,050
rounds |
N/A |
N/A |
N/A |
| Ammo
stowage/gun |
200
rounds |
N/A |
N/A |
N/A |
| Range |
6,000 yds,
at 3.3 ° elev. (1) |
9,500 yds,
at 10 ° elev. (2) |
6,800 yds at
10 ° elev. (5) |
3,450 yds at
10 ° elev. (6) |
| Range |
10,000
yds, at 6.5 ° elev. (1) |
13,400
yds, at 20 ° elev. (2) |
9,300
yds, at 20 ° elev. (5) |
4,275
yds, at 20 ° elev. (6) |
| Range |
20,000 yds, at 22.3 °
elev. (1) |
16,000 yds, at 30 °
elev. (2) |
10,690 yds, at 30 °
elev. (5) |
4,650 yds, at 30 °
elev. (6) |
| Range |
26,000
yds, at 44.5 ° elev. (1) |
17,200
yds, at 40 ° elev. (2) |
11,200
yds, at 40 ° elev. (5) |
4,775
yds, at 40 ° elev. (6) |
| Range |
26,118 yds,
at 47.5 ° elev. (1 |
17,400 yds,
at 45 ° elev. (2) |
11,130 yds,
at 45 ° elev. (5) |
4,800 yds,
at 45 ° elev. (6) |
| AA Ceiling
|
48,000 feet |
37,200 feet |
22,300 feet |
10,000 feet |
| Notes:
(1): With 130 lbs. AP, (2): With
55 lbs. AAC, (3): Water Cooled, (4): Air Cooled,
(5): With 1.985 lbs. HE, (6):
With 0.271 lbs. HE |
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