102 mm (4-inch) Mark XVI*

These guns appeared on these two ships after their completion in 1941. Jacob van Heemskerck originally had a main armament of 5.9 inch Mark 11 guns, but the needed fire control system couldn't be delivered. This type was very effective against air targets, but too light to be really useful in seabattles.

One of the twin 4-inch mounts aboard HMS Resolution in Gibraltar, 1939

Gun specs
Gun type	Mark XVI*
Purpose	High Angle/Low Angle (sea- and air targets)
Bore	10,2 cm (4-inch)
Classes used on	Jacob van Heemskerck Isaac Sweers
Date of design	1934
Date in service with RNN	1941 (commissioning of Jacob van Heemskerck)
Length	40 calibers (4,84 m)
Gunweight	2,4 tons
Initial velocity	2651 feet/sec
Rate of fire	20 rounds minute
Shell specs
Shell types	HE only
Shell weight	35 lbs
Range (maximum)	12000 meters @ 80 degrees
	16200 meters @ 0 degrees
Mount specs
Mount type	Mark XIX
Mount armor	-
Mount weight	14 tons
Elevation	-10 / +80 degrees
Train	340 degrees (+170/-170)
Train method	Manual

Diagram
Twin 4 inch Mark XVI* diagram  (click to enlarge)
A	Loading lamp
B	Percussion firing lever
C	Recuperator cylinder
D	Breech mechanism lever
E	Breech mechanism lever locking lever
F	Safe/fire lever
G	Semi-automatic gear link
H	Semi-automatic/quickfire changeover lever
I	Balance weight
J	Recoil cylinder compensating pipe
K	Training buffer
L	Fuze setting machine, Mark II
M	Follow fuze number
N	Fuze-setting handle
O	Ejector lever
P	Safety firing cam
Q	Safety firing rolling follower
R	Layer's footrest
S	Elevation receiver
T	Star shell datum spirit lever
U	Layer's monocular
V	Sighting ports
W	Deflection dial
X	Range dial
Y	Recuperator ram cross-head
Z	Cross-head tie rod
a	Recoil cylinder compensating tank
b	Intensifier
c	Interceptor

Links

B.R. 257 - Handbook for the 4 Inch Q.F. Mark XVI* Gun (1941). Link to website and to document.

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