Allgemein: JADE and WESER are Voith-Schneider tractors, that means the
propulsion units are located beneath the bow. The blades of the VSP's are protected against grounding on the underside bei a
nozzle plate. The plate increases the propellor thrust like a kort nozzle additionally. In dock the tugs stand on the nozzle
plates and skeg. Main engines of each tug are two MaK diesel motors type 8M25. Each motor delivers 2.500kW at 750rpm. The
engines are coupled to two VSP type 32GII/225 (Dia=3,20m, 5 blades of 2,25m length). The tugs have a maximum speed of 13,5kts
and 71tonnes bollard pull. A comparison with RT Magic (4.630kW using three Schottel-propellors, 76tbp) shows the 10% to 15% lower
thrust of the VS-propulsion at equal engine output caused by the incomplete nozzle provided by the nozzle plate. The tugs carry
207m3 fuel oil, 12m3 drinking water, 38m3 ballast water, and 5m3 lubricating oil.
The tugs have an open bulwark with a stern roller. This enables the tugs to take aboard Flipper-Delta-anchors of up to 10tonnes
weight during offshore work.
Afterdeck/ working deck:
The deck is protected by wooden sheeting and flanked by offshore-type cargo rails.
Bollards and guide rollers are located between bulwarks and cargo rails. The towing staple is placed amidst the deck. It has a
wooden sheeting on the front and can be tilted to the aft hydraulically until it is flush with the deck. This way the deck has
an unobstructed area of 80m2 and anchors can be taken aboard. Between towing staple and stern roller Karmoy shark
jaws and pins are located. The hydraulically driven HATLAPA towing winch is of the waterfall type. The lower drum is divided
in a drum carrying 300m steel wire for habour work and a drum with 220m steel wire for anchor handling. The upper drum carries
900m steel wire. All wires have 48mm diameter. The pulling power on the upper drum is 30tonnes at 0-24m/min, the brake power is
up to 150tonnes. A tugger winch and a capstan with a pulling power of 10tonnes each are located on the working deck too.
The deck is raised about a half deck above the afterdeck. The combined hydraulically
driven HATLAPA anchor and mooring winch is located at the bow. The winch has two gypsy wheels, one mooring drum, and one warp head.
It is above the foredeck and carries the wheelhouse. The MOB boat and its launching crane
are located in front of the wheelhouse between a breakwater and the wheelhouse. To follow the elevation of foredeck and working
deck the boat deck has a step behind the wheelhouse. The funnels and two life rafts are located at this step. A HAP BTLi 10-2 crane
with 0,7tonnes capacity at 10,4m reach is seated at the aft end of the boat deck.
A technical room was placed between boat deck and bridge deck as well as a stair
case from foredeck to bridge deck. The bridge deck carries the wheelhouse. HAGENUK supplied a large part of the navigational
equipment (2 radar systems type MD2100EPA, the ECS sytem, the GMDSS(A2) system, satellite telephone and weather fax. Autopilot
and gyrocompass came from Anschütz. The mast on top of the wheelhouse carries the navigation lights, two radars and two searchlights.
The mast can be tilted above the second radar.
Both tugs have a crew of three in habour work. Totally there are cabins for 8 persons.
Four single bed cabins, sanitary rooms, galley and mess room are on the foredeck. Two double cabins are placed directly below
but above the waterline.