German destroyer Z7 Hermann Schoemann
Encyclopedia
Z7 Hermann Schoemann was a built for the German Navy in the mid-1930s.
Design and description
Hermann Schoemann had an overall length of 119 metre and was 114 metre long at the waterline. The ship had a beamBeam (nautical)
The beam of a ship is its width at the widest point. Generally speaking, the wider the beam of a ship , the more initial stability it has, at expense of reserve stability in the event of a capsize, where more energy is required to right the vessel from its inverted position...
of 11.3 metre, and a maximum draft
Draft (hull)
The draft of a ship's hull is the vertical distance between the waterline and the bottom of the hull , with the thickness of the hull included; in the case of not being included the draft outline would be obtained...
of 4.23 metre. She displaced 2171 tonnes (2,136.7 LT) at standard and 3110 tonnes (3,060.9 LT) at deep load. The Wagner geared steam turbine
Steam turbine
A steam turbine is a mechanical device that extracts thermal energy from pressurized steam, and converts it into rotary motion. Its modern manifestation was invented by Sir Charles Parsons in 1884....
s were designed to produce 70000 shp which would propel the ship at 36 knots (19.6 m/s). Steam was provided to the turbines by six high-pressure Wagner boiler
Boiler (steam generator)
A boiler or steam generator is a device used to create steam by applying heat energy to water. Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure but, at pressures above this, it is more...
s with superheater
Superheater
A superheater is a device used to convert saturated steam or wet steam into dry steam used for power generation or processes. There are three types of superheaters namely: radiant, convection, and separately fired...
s. Hermann Schoemann carried a maximum of 752 tonnes (740 LT) of fuel oil
Fuel oil
Fuel oil is a fraction obtained from petroleum distillation, either as a distillate or a residue. Broadly speaking, fuel oil is any liquid petroleum product that is burned in a furnace or boiler for the generation of heat or used in an engine for the generation of power, except oils having a flash...
which was intended to give a range of 4400 nmi (8,148.8 km) at 19 knots (10.3 m/s), but the ship proved top-heavy in service and 30% of the fuel had to be retained as ballast
Sailing ballast
Ballast is used in sailboats to provide moment to resist the lateral forces on the sail. Insufficiently ballasted boats will tend to tip, or heel, excessively in high winds. Too much heel may result in the boat capsizing. If a sailing vessel should need to voyage without cargo then ballast of...
low in the ship. The effective range proved to be only 1825 nmi (3,379.9 km) at 19 knots (10.3 m/s).
Hermann Schoemann carried five 12.7 cm SK C/34 guns
12.7 cm SK C/34 naval gun
The 12.7 cm SK C/34 was a German medium-caliber naval gun deployed on destroyers from 1934 through the Second World War. Some of these guns remained in service until 2003 in the coastal defense units of Norway.-Characteristics:...
in single mounts with gun shield
Gun shield
thumb|A [[United States Marine Corps|U.S. Marine]] manning an [[M240 machine gun]] equipped with a gun shieldA gun shield is a flat piece or section of armor designed to be mounted on a crew-served weapon such as a machine gun or artillery piece, or, more rarely, to be used with an assault rifle...
s, two each superimposed
Superfire
The idea of superfire is to locate two turrets in a row, one behind the other, but with the second turret located above the one in front so that the second turret could fire over the first...
, fore and aft. The fifth gun was carried on top of the rear deckhouse. Her anti-aircraft
Anti-aircraft warfare
NATO defines air defence as "all measures designed to nullify or reduce the effectiveness of hostile air action." They include ground and air based weapon systems, associated sensor systems, command and control arrangements and passive measures. It may be to protect naval, ground and air forces...
armament consisted of four 3.7 cm SK C/30
3.7 cm SK C/30
The 3.7 cm SK C/30 was the German Kriegsmarine's primary anti-aircraft gun during the Second World War...
guns in two twin mounts abreast the rear funnel
Funnel (ship)
A funnel is the smokestack or chimney on a ship used to expel boiler steam and smoke or engine exhaust. They can also be known in as stacks.-Purpose:...
and six 2 cm C/30 guns in single mounts. The ship carried eight above-water 53.3 centimetres (21 in) torpedo tube
Torpedo tube
A torpedo tube is a 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 installed aboard surface vessels...
s in two power-operated mounts. Four depth charge
Depth charge
A depth charge is an anti-submarine warfare weapon intended to destroy or cripple a target submarine by the shock of exploding near it. Most use explosives and a fuze set to go off at a preselected depth in the ocean. Depth charges can be dropped by either surface ships, patrol aircraft, or from...
throwers were mounted on the sides of the rear deckhouse and they were supplemented by six racks for individual depth charges on the sides of the stern. Enough depth charges were carried for either two or four patterns of 16 charges each. Mine rails were fitted on the rear deck that had a maximum capacity of 60 mines
Naval mine
A naval mine is a self-contained explosive device placed in water to destroy surface ships or submarines. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, an enemy vessel...
.
Career
The ship was ordered on 9 January 1935 and laid downKeel
In boats and ships, keel can refer to either of two parts: a structural element, or a hydrodynamic element. These parts overlap. As the laying down of the keel is the initial step in construction of a ship, in British and American shipbuilding traditions the construction is dated from this event...
at DeSchiMAG
Deutsche Schiff- und Maschinenbau AG
Deutsche Schiff- und Maschinenbau Aktiengesellschaft was a cooperation of eight German shipyards in the period 1926 to 1945...
, Bremen
Bremen
The City Municipality of Bremen is a Hanseatic city in northwestern Germany. A commercial and industrial city with a major port on the river Weser, Bremen is part of the Bremen-Oldenburg metropolitan area . Bremen is the second most populous city in North Germany and tenth in Germany.Bremen is...
on 7 September 1935 as yard number W901. She was launched
Ship naming and launching
The ceremonies involved in naming and launching naval ships are based in traditions thousands of years old.-Methods of launch:There are three principal methods of conveying a new ship from building site to water, only two of which are called "launching." The oldest, most familiar, and most widely...
on 16 July 1936 and completed on 9 September 1937.