Table 1 contains pertinent data on VT fuzes for ready reference. The arming ranges gi-ven in the table are the distances from the gun at which 90% of all operable fuzes are fully armed and operative against a target. There is some spread of arming range among different fuzes, due to fluctuations in characteristics of components under mass-produc-tion conditions. For example, about 40% of the VT fuzes Mk 53 Mod 3 are armed by 400 yards; about 90% by 500 yards; a negligible number are armed at 300 yards.

Fuze

Guns

Average
Radius of
Operation
Against An
Airplane
(Ft.)

Arming
Range
(90%)
(Yds.)

Type of
Energizer

Used
with
Aux.
net

Remarks

Mk 47
Mod 0

6"/47 Projectile
Mk 34.

75

800

Reserve

Mk 44

WSF
CTW

Mk 53
Mods 5,
6

5"/38, 5"/25, 5"/51

75

500

Reserve

Mk 44

WSF
CTW

Mk 58
Mods 3,
4

3"/50

50

600

Reserve

Mk 44

WSF
CTW

Mk 59
Mod 0

5"/54

75

600

Reserve

Mk 44

WSF
CTW

Mk 69
Mod 0

6"/47 Mk 39 Proj. for
Double Purpose gun.

75

800

Reserve

Mk 44

WSF
CTW
Production
scheduled
for July
1946

Mk 173
Mod 4

5.0-inch Rocket,
Surface, High
Capacity, Spin-
Stabilized

Not recom-
mended for
A.A. use.
75 ft. over
water;
30-50 ft.
over land.

3,300

Reserve

Mk 44

WSF
CTW

Obsolete and Obsolescent Models

Mk 32
Mods
0-20

5"/38, 5"/25, 5"/51*

50

700

Dry

Mk 17,
46 or
54

Obsolete

Mk 32
Mod 30

5"/38, 5"/25

50

1,100

Reserve

Mk 17,
46, or
54

Obsolete

Mk 32
Mod 40

5"/38, 5"/25, 5"/51*

60

700

Dry

Mk 17,
46, or
54

WSF,
Obsolete

Mk 45
Mods
11, 12

3"/50

50

600

Reserve

Mk 44

Obsolete

Mk 53
Mods
0-2

5"/38, 5"/25, 5"/51*

75

800

Reserve

Mk 44

WSF,
Obsolete

Mk 53
Mods 3,
4

5"/38, 5"/25, 5"/51

75

500

Reserve

Mk 44

WSF,
Obsolete

Mk 58
Mods
0-2

3"/50

50

600

Reserve

Mk 44

WSF,
Obsolete

Mk 173
Mods
0-2

5.0-in. Rocket,
Surface, High
Capacity, Spin-
Stabilized

Not recom-
mended for
A.A. use.
75 ft. over
water;
30-50 ft.
over land.

3,300

Reserve

Mk 44

WSF,
Obsolete

* Mk 32 all Mods except Mod 30, and Mk 53 Mod 0 were recommended for use in 5"/51 guns at reduced charge of 2600 f/s. All other Mk 53 may be fired at full charge.

WSF = Wave-Suppression Feature.

CTW = Compression-Type Waterproofing.