-   The Rotor®-tug of Bugsier

Bugsier-, Reederei- und Bergungsgesellschaft GmbH & Co. KG commissioned BUGSIER 3, the last of the three tractor tugs with rudder propellers built by shipyard K.Damen, The Netherlands in September 2006. These tugs have fully bunkered a draught of 6.70m and a bollard pull of 63t. Within a short period of time Bugsier reduced the draught in harbour service by running them only partly bunkered. It was foreseeable, that more bollard pull in a tractor tug would not make much sense in the German harbours as the necessary larger rudder propellers would lead to even more draught. At that time Bugsier didnít like to quit the tractor tug principle. As alternative they considered the Rotor®-tug concept. These tugs would have 80cm less draught compared to BUGSIER 3 with 80t bollard pull. Bugsier decided to buy three Rotor®-tugs type RT-80r from Kooren Shipbuilding & Trading (KST). URAG made the same experience with their Voith-Schneider Tugs ELBE and EMS. They had a draught of 7.12m fully bunkered (240m3) and 6,36m with just 100m3 fuel oil. URAG came to the same conclusions and ordered two tugs type RT-80-28 (formerly RT-80r) in February and two tugs of the same type in August 2007. The URAG order is especially remarkable as it is their first turning away from Voith-Schneider propulsion in decades. The Bugsier tugs will be named as follows:


-   Construction phase

The Rotor®-tug type RT-80r is a further development of the well established type RT-60 (RT ANTONIE and sisters).The breadth of the hull was enlarged by 30cm to accommodate the larger rudder propellers and the draught was increased to 5,95m. All other dimensions remained unchanged. The development was carried out on KSTís own expense not having a customer yet. On 5.May 2006 KST published Bugsierís order for three of the four tugs already ordered by KST at ASL Shipyard Pte, Singapore. The detailed design was carried out by Kenton Marine Singapore Pte Ltd according to the rules of Germanischer Lloyd (GL) and See-Berufsgenossenschaft (See-BG, Seamen's Accident Prevention and Insurance Association). The tugs are classified as +100 A5 M Tug MC AUT FF1, i.e. the tugs are restricted to within 200nm from shore. The construction of the tugs, yard numbers 817, 818, and 819, commenced at ASL shipyard in January 2007. The tugs were launched as follows:

  • BUGSIER 6   26.10.2007
  • BUGSIER 4   14.11.2007
  • BUGSIER 5   26.01.2008
BUGSIER 6 arrived as deck load on BBC ISLANDER in Rotterdam on 28.04.2008 and was towed by BUGSIER 12 to Wilhelmshaven for final finishing at the shipyard Neue Jadewerft. She got commissioned in Bremerhaven in end of July 2008. BUGSIER 4, BUGSIER 5, and Kotugís RT MARGOT, yard number 820, arrived on board of MS PETKUM in Rotterdam on 2. November. BUGSIER 5 left Rotterdam behind the tug ARION on 5.November 2008 bound again for Wilhelmshaven. She got commissioned in Hamburg after final finishing at the Neue Jadewerft end of January 2009. After two unsuccessful attempts to tow BUGSIER 4 to Wilhelmshaven because of weather conditions, she left finally behind BUGSIER 20 on 1.12.2008. She was commissioned in March 2008 and stays in Wilhelmshaven for the time being.

-   Description

General: The propulsion concept stayed unchanged. The tugs are tractors with two rudder propellers beneath the bow where the aft skeg has been replaced by a third rudder propeller. Protective plates on heavy struts protect the propulsion units and are used as docking supports. The propulsion units were provided by Wärtsilä/Lips and are of the type CS225-S/WN-K. The controllable pitch propellers with a diameter of 2.30m run in Lips HR-nozzles. The three main engines are Wärtsilä 8L20 diesel engines delivering 1,600kW/ 2,175bhp at 1,000rpm. The same engines work in the RT-60 tugs but with less engine compression. BUGSIER 4, 5, and 6 achieved a forward bollard pull between 82t and 86t. Because of the propulsion concept the bollard pull astern is almost the same. The maximum speed is 13kts. The tank capacities among others are 120m3 fuel oil, and 30m3 fresh water. The range is approx. 4,000nm using just one propulsion unit. All tugs are equipped according to FiFi1 standards. Two Nijhuis pumps are coupled to the aft end of the bow engines proving water for the two 1,200m3/h Skum fire fighting monitors and the 300m3/h deluge system.

Below main deck:

The aft rudder propeller is mounted in a separate compartment. In front of it is the engine room with the three Wärtsilä main engines, two Volvo Penta diesel generator sets with 120kW each, a harbour set with 25kW, the main switchboard, and the fire fighting pumps. The main engines are coupled through a short straight shaft to the propulsion units. The main engines are not mounted side by side as in the first Rotor®-tugs but offset lengthwise. The two forward propulsion units are placed in a separate compartment in front of the engine room. Between the two rudder propellers the waste-water treatment plant is mounted. In the following compartment forward a two-berth cabin with sanitary space and a room with a washer and a dryer are located. Further forward are the chain lockers.

Main deck:

Superstructure: In the deckhouse the floor is raised about 50cm above the aft deck. On the starboard side are located from front to aft: captainís single-berth cabin with en-suite sanitary space, chiefís single-berth cabin, a sanitary space, and a twin-berth cabin. The last mentioned sanitary space is accessible from the two adjacent cabins and the corridor. At port, again starting at the front you find the mess, galley, and a toilet room. The entrance to the deckhouse is from the aft deck. The funnels are placed at the aft end of the superstructure. Behind the funnel you find the CO2 room at port and a store at starboard.

Aft deck: The aft towing winch is mounted between the funnels. Plimsoll provided the hydraulic winch type HTW/SD-30/200. The single drum has pulling powers of 30t at maximum 15m/min and 13t at 30m/min respectively as well as a brake power of 200t. There is one warping head. The high-pressure hydraulic motors are from Staffa/Kawasaki. The stern winch is used on Rotor®-tugs preferentially and has a capacity of 500m steel wire of 52mm. For the time being it carries 150m steel wire with synthetic rope stretcher and steel wire pennant as harbour towline. The winch is offset to starboard to make room for the passage on the port side. The tugs donít have a towing hook. The towing fairlead (staple) is mounted above the aft propulsion unit. A Palfinger Marine hydraulic knuckle boom crane type PK 12000 is fitted to a column behind the starboard funnel. The crane has a load torque of 11.6t*m and a s.w.l. of 0,95t at the maximum reach of 10.2m. Without a stern roller or a cut-out in the stern bulwark the tugs are only limited suitable for offshore work.

Forecastle deck: Five steps at the end of the superstructure and two more at its front end are leading to the forecastle deck. So it is about a half decks height above the aft deck. A Plimsoll high-pressure hydraulic anchor and towing winch type HATW/GDG-22-30/200 is mounted on the forecastle. The winch has two chain lifters for 22mm diameter grade U2 chains, two warping heads, and one towing drum. There are two HHP anchors with a weight of at least 495kg. The anchor winch has a holding power of 13t and a pulling power of 2.1t at 10m/min. The towing drum has a capacity of 250m Dyneema synthetic rope of 70mm diameter or 350m steel wire of 52mm diameter. For the time being the drum carries 120m synthetic rope and a steel wire pennant. The drum has pulling powers of 30t at maximum 15m/min and 13t at 30m/min respectively as well as a brake power of 200t. The high-pressure hydraulic motors were provided by Staffa/Kawasaki.

Boat deck:

On either side at the front end a Viking inflatable life raft for 8 persons each is mounted in a rack. The work/ life boat is a Zodiak inflatable with outboard engine. The boat crane was provided by Global David GmbH. Aft two Skum fire monitors are mounted on pedestals behind the funnels. The middle part carries a 1m high deck accommodating the battery room and stores with the wheelhouse on top.

Bridge deck:

Two control consoles are placed in the wheelhouse to the left and right of the shipís centre line. They carry among other things the three independent propeller controls and a master controller jointly controlling all three rudder propellers simultaneously. The rail-mounted captainís chair was fitted between the consoles. The navigational equipment contains among others a magnet compass, gyro compass, autopilot, two radars (one a river radar), DGPS, echo sounder, and a speed log. The communication equipment corresponds to GMDSS-A2 standard and contains VHF, SSB radio telephone, Navtex, Inmersat-C, Epirb, SART, and Intercom. Most of the equipment was provided by Furuno.

Top deck:
It carries the mast, two independently mounted radars, the magnet compass, two remote controlled search lights from Karl Dose GmbH, and antennas. The mast can be tilted at a joint approx. 1.5m above the deck and carries just the navigational lights.


For the time being ship assist duties in Bremerhaven (BUGSIER 6), Hamburg (BUGSIER 5), and Wilhelmshaven (BUGSIER 4)

-   Particulars

Main dimensions:
Length over all: 28,30m
Length in waterline: 26,10m
Breadth moulded: 11,50m
Breadth over all: 12,00m
Depth: 05,24m
Draught, moulded: 03,30m
Draught, maximum: 05,95m
Air draught: 11,00m with tilted mast
Survey: 397 BRZ
Main engines: 3x Wartsilä 8L20C diesel engines
Output: 3x 1.600kW/2,175bhp at 1,000rpm, Total 4,800kW/ 6,525bhp
Bollard pull, forward/astern: 82 Ė 86t, dependent on tug/ approx. like forward
Speed: 13kts

Bugsier-, Reederei- und Bergungsgesellschaft mbH & Co. KG,
Website Kooren Shipbuilding and Trading (KST)

For photos in higher resolution please click the thumbnails!
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Bugsier 6 on board of BBC Islander Bugsier 4 on board MS Petkum
Bugsier 5, starboard view Bugsier 6, starboard view
Bugsier 6, port view Bugsier 6, stern view
Bugsier 6, port view Bugsier 6, port view of superstructure
Bugsier 6, bow view Bugsier 6, bow view of mast
Bugsier 6, bow view of wheelhouse Bugsier 6, stern view of wheelhouse
Bugsier 6, port fire fighting pedestal Bugsier 6, Skum fire fighting monitor
Bugsier 6, bow fenders and anchor pockets Bugsier 6, stern fenders
Bugsier 6, aft deck Bugsier 6, Palfinger crane
Bugsier 6, Plimsoll stern towing winch Bugsier 6, high-pressure hydraulic motor
Bugsier 6, aft deck with winch and towing fairlead (staple) Bugsier 6, starboard view of Plimsoll combined anchor- and towing winch
Bugsier 6, port view of Plimsoll combined anchor- and towing winch Bugsier 6, bow view superstructure
Bugsier 6, starboard passageway Bugsier 6, companionway to wheelhouse
Bugsier 6, main control consoles Bugsier 6, starboard control console
Bugsier 6, view to stern Bugsier 6, main switchboard
Bugsier 6, starboard main engines Bugsier 6, main engine powering aft propeller
Bugsier 6, Nijhuis fire fighting pump Bugsier 6, Volvo Penta diesel generator
Bugsier 6, forward port rudder propeller Bugsier 6, aft rudder propeller
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