TYPE: Minelayer
CLASS: Minenschiff Brummer
BUILDING SITE: Marinens Hovedverft, Horten
BUILDING NUMBER: 119
LAUNCHED: 21 December 1932
HOIST COMMAND: 24 May 1934
ARMAMENT 1940 (Original) Albatros
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4x 120mm L/44 M1934 Bofors cannons
Barrel length in caliber: L/44
Model and make: M1934 Bofors
Max firing range: 16.400 Meter -
1x 76mm ALK anti air cannon
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2x 40mm Salut-cannon
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2x 12.7mm Colt MK machineguns
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1x 45.7cm Double Torpedocannon
Mobility: Turnable 360° degrees
Torpedo;
Whitehead Model IX
Dimensions: 45cm x 5.3m
Weight: 731 - 735 Kilogram
Warhead: 100 Kilogram
Speed & Ranges:
38-40kn/2000m
36kn/3000m
30kn/5000m
28-30 kn/6000m -
280 mines
Operation: 3x doors on the aft of the vessel where the mines were rolled out and dropped in the sea, proably 2-3 racks inside
The mines that were most likely used:
Type 1911 Loddmine
-Weight: 60 kg
Type 1916
I have no data on this
Pendelmine Type 1917
Anchored shock mine
with cylindrical steel mine dome
explosive charge consisted of 30 kg of TNT.
The Navy’s 60 kg lead mine Type 1911
anchored land mine
with cylindrical cast iron mine dome
a pendulum released the detonator if a vessel hit the mine
The explosive charge consisted of 60 kg of explosive cotton
ARMAMENT 16.05.1940 Brummer
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4 × Sk 12.7 cm C/34
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2 × Sk 3.7 cm L/83 C/30
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4 × Flak 2.0 cm L/65 C/30
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up to 280 sea mines
ARMAMENT 1943 Brummer
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3x Sk 10.5 cm L/45 C/32 Cannons
-Placements:
-Gun Weight: 1,585 kg
-Gun Length oa: 4.740 m
-Bore Length: 4.400 m
-Rifling Length: 3.694 m
-Grooves: 1.25 mm x 6.8 mm
-Lands: 3.5 mm
-Twist: Increasing RH 1 in 45 to 1 in 30
-Chamber Volume: 5.380 dm3
-Rate Of Fire: 15 rounds per minute
-Estimated reload time: 4 seconds -
2x Sk 3.7 cm L/83 C/30
-Gun Weight: 243 kg
-Barrel Length: 3.074 m
-Bore Length: 2.960 m
-Rifling Length: 2.554 m
-Grooves: 0.55 mm x 4.76 mm
-Lands: 2.5 mm
-Twist: Increasing RH 1 in 50 to 1 in 35
-Chamber Volume: 0.500 dm3
-Rate Of Fire: about 30 rounds per minute
-Estimated reload time: 2 seconds
-Projectile Length: 162 mm 4a
-Propellant Charge: 5a 0.365 kg RPC/38N
-Cartridge: 0.97 kg
-Muzzle Velocity: 1,000 mps
-Complete Round Weight: HE-T: 2.1 kg -
10x Flak 2.0 cm L/65 C/30
-Gun Weight C/30: 64 kg
-Gun Length oa: 2.2525 m
-Bore Length: 1.300 m
-Rifling Length: 1.159 m
-Number Of Grooves: 0.325 mm x 5.2 mm
-Lands: 2.65 mm
-Twist: Uniform RH 1 in 36
-Chamber Volume: 0.048 dm3
-Rates Of Fire C/30:
-280 rounds per minute cyclic
-120 rounds per minute practical
-Cartridge: 20 x 138B mm,
-Muzzle Velocities
–AP-T: 800 mps
–HE-I: 875 mps
–HE-T: 875 mps -
280 sea mines
TECHNICAL DATA
Deplacement: 1.924 Metric Tons
Length: 97.3 Meter (oa)
Width: 11.45 Meter
Depth: 3.6 Meter
MACHINERY
2x Del Laval Steam-turbines
Power: 4600 AHP
2x 8cyl Sulzer Diesel eignes
Power: 1400 AHP
Speed: 22 knots (40.74 km/h)
Bunkers: 200 Metric Tons of Oil
Range: 3000 N.Miles at 14 Knots (25.92 Km/h)
CREW
Crew As Minelayer: 135 men
ARMOR
Hull material: Steel
HISTORY
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when the Storting in July 1930 finally allocated money for the construction of a new and larger naval vessel, there were a number of needs that had to be taken care of with this one vessel. It was highly necessary to get a replacement for the armored ship Tordenskjold, which had served as a Cadet ship in recent years. Because such voyages often went abroad and involved a degree of representation, it also had to be a relatively large vessel. From both a defense and an exercise perspective, it was important that the ship also had good reinforcement. The fact that they chose to construct it as a minelayer may seem somewhat strange. Fair enough, the interest in mines had picked up somewhat at this time, after the development of this weapon had come to a standstill after the First World War. But Norway, with Frøya, Glommen and Laugen, was reasonably well covered in minelaying, compared to other needs.
As a pure minelayer, Olav Tryggvason was designed to be able to take 280 mines. Most of these were to be placed on mine rails on the continuous mine deck which ended up in three mine hatches in the stern, but also on the main deck it was originally planned to be able to attach mine rails. As a training ship, there also had to be room for 50-60 cadets and for this purpose, space was made on the mine deck for makeshift baths and toilets for the cadets. In order to save space and money, it was arranged that both cadets and ordinary crew should sleep in hammocks. Olav Tryggvarson was designed with a special and complicated propulsion machinery consisting of both two diesel engines and two steam turbines. These could act separately on the two propeller shafts or simultaneously and they could be controlled from the bridge. The four 12cm Bofors guns were also special in the sense that for the first time they were partially produced under license at the Navy’s own artillery workshop
In early April, Olav Tryggvason was at the Navy’s main shipyard for some repair work. They had not received the notification of heightened preparedness on the evening of 8 April and part of the crew, including three of the four gun commanders, had thus received leave of absence. Late in the evening, however, Briseid was informed by Admiral Smith-Johansen that a German attack could be expected. Olav Tryggvason therefore moved to a buoy with the broadside towards Vealøs and from 02.15 it was declared “clear ship”. Because they thought the minesweepers Otra and Rauma were further out and would warn of enemy vessels with flares, they were nevertheless surprised when the German minesweepers R17 and R21 passed by at a distance of only 60 meters on their way westward into the inner harbor to land soldiers. rather than immediately open fire and draw all guns, Briseid first chose to fire warning shots. Only when R17 approached the landing pier did the sharp shooting begin. The R17 was hit first, but it managed to land most of the soldiers before it was hit again. A little later, Olav Tryggvason directed his fire at the torpedo boat Albatros, which tried to enter Indre Havn. This was successful in the sense that both Albatros and the sister ship Kondor lay down outside Østøya, where they were directed to fire blindly across the island and into the harbour. The fact that the R-boats had moved and landed their soldiers later turned out to be what decided the battle for Horten, as these, under threat such as bombing the main base, achieved the goal of a peaceful surrender
Olav Tryggvason, who was only slightly injured, was of course quickly put into German service. There it was named Brummer, after a German minesweeper and artillery ship of that name which had previously been torpedoed in the Kattegat. It was also in this role that the Germans used the Norwegian vessel during the war, first in the North Sea and later in the Baltic Sea. Here, Brummer took part in the fight against the Soviet Union with both mine blockades and other operations. From the winter of 1942/1943 it operated as a minelayer in northern Norwegian waters and further east towards Petsamo. Towards the end of the war, Brummer was back in the Baltic Sea, where in the last phase it took part in the evacuation of German troops from the Baltic. On 3 April it was at the Deutche Werke in Kiel, where it was bombed to a total wreck in drydock number 2 during a heavy Allied bomb attack. After the capitulation, the wreck was blown to pieces and the wreckage was used as filling material for new quay facilities.
After Horten surrendered, the HNoMS Olav Tryggvason was put in service of the Kriegsmarine and renamed Albatros, but later the 16 may 1940 it was renamed Brummer in honor of the artillery training ship that had this name, and were sunk earlier the 9th of april. At this time the armament of the vessel had been changed a bit with the 4x 120mm cannons remaining, but the 76mm and 40mm cannons had been removed and replaced by two German 3.7mm cannons and four 20mm cannons. It was also received further changes later in 1943, when the four 120mm cannons were removed from the vessel and brought on land to serve as coastal artillery along the coast, by 3x Sk 10.5 cm L/45 C/32 Cannons. The two 37mm cannons remained but the 20mm cannons was increased from four to ten, it seems like this was turrets, with 4 cannons on each. It also seems like the Germans modified the vessel to carry way more than the 250-280 internal mines like it were originally designed and built to do, as if needed additional mines (At least 40-43 mines in 2 rows on the deck) as i can count in pictures, could be carried and dropped off with the skins that were added on the aft. If the Germans used the Norwegian mines is uncertian.
WITH ADDITIONAL MINES ON DECK
IN GAME
Germany as known captured a very very large amount of vehicles, planes and especially naval vessels. In general, to include every vessel they captured (can never happen practically xd) except some of the vessels that they modified (There are just so many!) probably close to 50 just from Norway. But vessels that were rebuilt in such a degree as this i guess would be better. I believe the two refits of this vessel could be included in a nice event vessel for the German naval techtree, or potentially as a premium or obtainable in another way.
BLUEPRINT (Norwegian)
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ALBUM
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SOURCES
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Main source
Nasjonalbiblioteket
Marine-Arsenal 43: Minenschiff Brummer II 1940-1945
Amazon.de
Publisher : Podzun-Pallas (1 Jan. 1999)
Language : German
Paperback : 48 pages
ISBN-10: 3790906611
ISBN-13: 978-3790906615
120mm cannons specs and information that they were used as coastal artillery
Nasjonalbiblioteket
1943 REFIT WEAPONS
Sk 10.5 cm L/45 C/32 Cannons
Germany 10.5 cm/45 (4.1") SK C/32 - NavWeaps
3.7 cm/83 SK C/30
Germany 3.7 cm/83 SK C/30 - NavWeaps
2 cm/65 (0.79") C/30 AA MG
Germany 2 cm/65 (0.79") C/30 and C/38 - NavWeaps
- Yes
- No