The Type 1936A destroyers, also known as the ''Z23'' class, were a group of fifteen
destroyer
In naval terminology, a destroyer is a fast, manoeuvrable, long-endurance warship intended to escort
larger vessels in a fleet, convoy or battle group and defend them against powerful short range attackers. They were originally developed in ...
s built for the
Nazi Germany
Nazi Germany (lit. "National Socialist State"), ' (lit. "Nazi State") for short; also ' (lit. "National Socialist Germany") (officially known as the German Reich from 1933 until 1943, and the Greater German Reich from 1943 to 1945) was ...
's ''
Kriegsmarine
The (, ) was the navy of Germany from 1935 to 1945. It superseded the Imperial German Navy of the German Empire (1871–1918) and the inter-war (1919–1935) of the Weimar Republic. The was one of three official branches, along with the a ...
'' from 1938 to 1943. They were known to the
Allies
An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether or not explicit agreement has been worked out among them. Members of an alliance are called ...
as the Narvik class. In common with other German destroyers launched after the start of World War II, the Narviks were unnamed, known only by their hull numbers – ''Z23'' to ''Z39''.
Design
![Narvik-class destroyer](https://upload.wikimedia.org/wikipedia/commons/1/19/Narvik-class_destroyer.jpg)
In terms of armament, they were closer to light cruisers than the typical destroyer. The use of guns was atypical of destroyers which tended to have guns around in calibre. They were intended to carry two forward guns in a twin turret, but as the twin turrets were not ready in time, early class 1936As carried a single mounted gun forward.
Despite being powerful the ships were not without their flaws. There were problems with the reliability of the high pressure steam engines and seakeeping in rough seas due to the newly designed bow and heavy forward artillery.
The eight ships of the Type 1936A design (''Z23'' to ''Z30'') were all laid down between 1938 and 1940. The seven destroyers numbered from ''Z31'' to ''Z39'' were classed as Zerstörer 1936A (Mob); they were laid down in 1940 and 1941 and were slightly larger and had some internal modifications (including engines that caused less trouble than with their predecessors) from the original design to shorten construction times.
Description
The ships had an
overall length
The overall length (OAL) of an ammunition cartridge is a measurement from the base of the brass shell casing to the tip of the bullet, seated into the brass casing. Cartridge overall length, or "COL", is important to safe functioning of reloads i ...
of and were
long at the waterline. They had a
beam
Beam may refer to:
Streams of particles or energy
*Light beam, or beam of light, a directional projection of light energy
**Laser beam
*Particle beam, a stream of charged or neutral particles
**Charged particle beam, a spatially localized grou ...
of , and a maximum
draught of . They displaced at
standard load
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into wei ...
and at
deep load
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into wei ...
. The ship's
hulls were divided into 16
watertight compartment
A compartment is a portion of the space within a ship defined vertically between decks and horizontally between bulkheads. It is analogous to a room within a building, and may provide watertight subdivision of the ship's hull important in retaini ...
s and they were fitted with a
double bottom
A double hull is a ship Hull (watercraft), hull design and construction method where the bottom and sides of the ship have two complete layers of watertight hull surface: one outer layer forming the normal hull of the ship, and a second inner hull ...
that covered 47% of their length
amidships
This glossary of nautical terms is an alphabetical listing of terms and expressions connected with ships, shipping, seamanship and navigation on water (mostly though not necessarily on the sea). Some remain current, while many date from the 17th t ...
. Their crew consisted of 11–15 officers and 305–20 sailors; when serving as a flagship an additional 4 officers and 19 sailors were assigned.
The Type 1936As were powered by two Wagner geared
steam turbine
A steam turbine is a machine that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft. Its modern manifestation was invented by Charles Parsons in 1884. Fabrication of a modern steam turbin ...
sets, each driving a single three-bladed
propeller
A propeller (colloquially often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon ...
, using steam provided by six high-pressure Wagner
water-tube boiler
A high pressure watertube boiler (also spelled water-tube and water tube) is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which boils water in the steam-gene ...
s with
superheater
A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, steam engines, and in processes such as steam reforming. There ar ...
s that operated at a pressure of and a temperature of . The turbines were designed to produce for a speed of . The ships carried a maximum of of
fuel oil
Fuel oil is any of various fractions obtained from the distillation of petroleum (crude oil). Such oils include distillates (the lighter fractions) and residues (the heavier fractions). Fuel oils include heavy fuel oil, marine fuel oil (MFO), bun ...
which gave a range of at .
[Gröner, p. 204]
Armament and sensors
The main armament of the Type 1936A ships was intended to be five 45-
calibre
In guns, particularly firearms, caliber (or calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel bore – regardless of how or where the bore is measured and whether the finished bore match ...
TbtsK C/36 guns in a twin-
gun turret
A gun turret (or simply turret) is a mounting platform from which weapons can be fired that affords protection, visibility and ability to turn and aim. A modern gun turret is generally a rotatable weapon mount that houses the crew or mechani ...
forward and the three other guns in single mounts with
gun shield
A U.S. Marine manning an M240 machine gun equipped with a gun shield
A gun shield is a flat (or sometimes curved) piece of armor designed to be mounted on a crew-served weapon such as a machine gun, automatic grenade launcher, or artillery piece ...
s aft of the main
superstructure
A superstructure is an upward extension of an existing structure above a baseline. This term is applied to various kinds of physical structures such as buildings, bridges, or ships.
Aboard ships and large boats
On water craft, the superstruct ...
, but delivery of the turrets was delayed and all of the Type 36A class was delivered with four single 15 cm guns with one gun forward and three aft. ''Z28'' was the sole exception as its armament was arranged with two single mounts fore and aft. ''Z23'', ''Z24'', ''Z25'' and ''Z29'' were later fitted with the turret. All of the Type 36A (Mob) ships except ''Z31'' were built with the turret and that ship received one later. The single mounts had a range of elevation from −10° to +30° while the guns in the turret could be elevated to 65°. The TbtsK C/36 gun fired projectiles at a
muzzle velocity
Muzzle velocity is the speed of a projectile (bullet, pellet, slug, ball/shots or shell) with respect to the muzzle at the moment it leaves the end of a gun's barrel (i.e. the muzzle). Firearm muzzle velocities range from approximately to i ...
of which gave them a maximum range of . The hand-loaded gun had a maximum rate of fire of 7–8
rounds per minute and the ships carried a total of 480 shells for them.
Their anti-aircraft armament consisted of four 80-calibre
SK C/30 guns in two twin mounts abreast the aft
funnel
A funnel is a tube or pipe that is wide at the top and narrow at the bottom, used for guiding liquid or powder into a small opening.
Funnels are usually made of stainless steel, aluminium, glass, or plastic. The material used in its construct ...
.
[Whitley, p. 201] The power operated mounts had a maximum elevation of 85° which gave the guns a ceiling of ; horizontal range was at an elevation of 37.5°. The single-shot SK C/30 fired projectiles at a muzzle velocity of at a rate of 30 rounds per minute. The mounts were stabilized, but their
gyroscope
A gyroscope (from Ancient Greek γῦρος ''gŷros'', "round" and σκοπέω ''skopéō'', "to look") is a device used for measuring or maintaining orientation and angular velocity. It is a spinning wheel or disc in which the axis of rota ...
s were undersized and could not cope with sharp turns or heavy
rolling
Rolling is a type of motion that combines rotation (commonly, of an axially symmetric object) and translation of that object with respect to a surface (either one or the other moves), such that, if ideal conditions exist, the two are in contact ...
. They were also fitted with five to ten fully automatic 65-calibre
C/30 guns in quadruple and single mounts.
[ The gun had an effective rate of fire of about 120 rounds per minute. Its projectiles were fired at a muzzle velocity of which gave it a ceiling of and a maximum horizontal range of .
The ships carried eight above-water ]torpedo tube
A torpedo tube is a cylindrical device for launching torpedoes.
There are two main types of torpedo tube: underwater tubes fitted to submarines and some surface ships, and deck-mounted units (also referred to as torpedo launchers) installed aboa ...
s in two power-operated mounts. Two reloads were provided for each mount. The standard torpedo for the Type 36B destroyers was the G7a torpedo
The G7a(TI) was the standard issue ''Kriegsmarine'' torpedo introduced to service in 1934. It was a steam-powered design, using a wet heater engine burning decaline, with a range of at speed. In 1936, the Kriegsmarine's first electrical powered ...
. It had a warhead
A warhead is the forward section of a device that contains the explosive agent or toxic (biological, chemical, or nuclear) material that is delivered by a missile, rocket, torpedo, or bomb.
Classification
Types of warheads include:
* Explosiv ...
and three speed range settings: at ; at and at . They had four depth charge
A depth charge is an anti-submarine warfare (ASW) weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive Shock factor, hydraulic shock. Most depth ...
launchers and mine rails could be fitted on the rear deck that had a maximum capacity of 60 mines. 'GHG' (Gruppenhorchgerät
The ''Gruppenhorchgerät'' ('group listening device', abbreviated GHG) was a hydrophone array which was used on Nazi Germany's U-boats in World War II.
Development
In World War I carbon microphones were still used as sound receivers. The individu ...
) passive hydrophone
A hydrophone ( grc, ὕδωρ + φωνή, , water + sound) is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates an electric potenti ...
s were fitted to detect submarine
A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely op ...
s and a ''S-Gerät'' sonar
Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigation, navigate, measure distances (ranging), communicate with or detect o ...
was also probably fitted. The ships were equipped with a ''FuMO'' 24/25 radar
Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...
set above the bridge
A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually somethi ...
.[Gröner, pp. 203–206; Koop & Schmolke, pp. 103–107, 113, 116–119; Whitley, pp. 68, 71–73, 201]
Ships
The class, including the 36A (Mob), consisted of 15 ships. All were built in Bremen
Bremen (Low German also: ''Breem'' or ''Bräm''), officially the City Municipality of Bremen (german: Stadtgemeinde Bremen, ), is the capital of the German state Free Hanseatic City of Bremen (''Freie Hansestadt Bremen''), a two-city-state consis ...
by AG Weser
Aktien-Gesellschaft „Weser" (abbreviated A.G. „Weser”) was one of the major German shipbuilding companies, located at the Weser River in Bremen. Founded in 1872 it was finally closed in 1983. All together, A.G. „Weser" built about 1,400 ...
shipyard (part of Deutsche Schiff- und Maschinenbau AG
Deutsche Schiff- und Maschinenbau Aktiengesellschaft (abbreviated Deschimag) was a cooperation of eight German shipyards in the period 1926 to 1945. The leading company was the shipyard AG Weser in Bremen.
History
The Deschimag was founded in 1 ...
/Deschimag) apart from Z37, Z38 and Z39 which were built by Germania
Germania ( ; ), also called Magna Germania (English: ''Great Germania''), Germania Libera (English: ''Free Germania''), or Germanic Barbaricum to distinguish it from the Roman province of the same name, was a large historical region in north- ...
(Kiel).
1936A
1936A (Mob)
Notes
Bibliography
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Further reading
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{{WWII German ships
Destroyer classes
de:Zerstörer 1936#Unterklasse Zerstörer 1936A