ALAMARIN-JET OY

Technical specification of

Jet-288

Jet-288 basic data Power max. 330kW/443hp Rpm max. 3500 1/min Vessel displacement max. 5t/11000lb (single jet) Unit weight 120kg/265lb Maximum diameter of impeller 288mm/11.4” Materials Aluminum, high grade stainless steel, plastic

Installation in general 1. Jet takes small space from engine compartment. However it can be integrated deeper into the

boat hull. 2. Very quick installation in serial production. Installation template shape is in the hull mould. The jet

can be installed also into one-off boats. 3. Compact structure, no complicated adjustments. 4. Standard coupling flange is DIN-150, adapters for different intermediate shafts are available.

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Bearings and main shaft 1. In the front end there is axial thrust bearing that carries loads in both directions. The same

bearing carries also radial loads.

a) Mechanical sealing in the inlet side. Long life time. b) Oil lubrication, oil circulates through the reservoir when main shaft rotates. Impurities are gathered in the

reservoir. c) Very easy to maintain, long service intervals.

2. In the rear end there is grease lubricated needle roller bearing.

a) Lubrication machine as a standard, filling interval circa. 300h. Lubrication channel leads from engine compartment to rear bearing housing.

b) Shaft seals are protected against over pressure. c) Very easy to maintain. Long service intervals. No problems of abrasive materials like with water lubricated

bearings. d) In the end of the shaft there is slide bushing that can be replaced if worn. e) Water lubricated bearing can be used also.

3. To prevent lines and ropes to cut in the main shaft hole in the inlet, there is contra-thread on the shaft.

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Steering and control 1. For steering there is mechanical levers and shaft-system. Steering lever can be moved

mechanically by cable, hydraulic or electrical device.

a) Lever is fixed on the shaft with taper bush. position can be chosen freely. b) Grease lubricated lead-in in the transom for steering shaft. c) Steering nozzle works perfectly due to fin in the centerline. It is not in the free flow when going straight

forward so it does not cause resistance. Steering is very exact also at slow speed.

2. Reverse deflector hydraulic system is controlled mechanically by cable.

a) Reverse deflector is rugged aluminum casting. b) Very powerfull, flow is devided in the both channels. c) Compact hydraulic system, pump as a standard. Cylinder is developed by Alamarin-Jet. d) Very easy to adjust.

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Impeller

1. Impeller tunnel is stainless steel cone. Very durable structure. Steel cone is joint casted. 2. Impeller material is AISI316 stainless steel 3. Clearance is easy and quick to adjust because of conical tunnel. 4. Impeller is electrically separated from the jet structure because it is attached to shaft with

plastic taper sleeve less sensitive to galvanic corrosion. 5. Flexible tuning of the jet for different engines and applications by changing the impeller

diameter. 6. Intake protected with screen which prevents too big objects to enter the inlet and thus

protects impeller of damages.

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Inspections hatch

1. Blockages are possible to remove through the inspections hatch which is outside of the boat due to safety reasons; leakage will not sink the boat.

Corrosion protection 1. Three layer painting on aluminum parts.

a) Salt water immersion and mechanical abrasion resistant, hard epoxypainting. b) Pre-treatment ensures the paint adhesion to aluminum.

2. Cathodic protection prevents galvanic corrosion destroying effect. (in picture some anodes are pointed).

a) Zinc anodes are placed evenly to cover all areas inside and outside of the unit. b) Zinc replacement is easy job. Inside anodes can be changed without disassembling the unit.

Raw water cooling for engine 1. There are two water intakes in the unit as a standard. Very effective cooling can be achieved. 2. Pressure is ~4 bars at maximum. Water intake can be used also for washing and flushing

purposes.

References

HTech A25 Manufacturer: HT Engineering Type: SAR-boat Length: 7,95m Beam: 2,85m Displacement: 2,7t Engine: Steyr MO 306, 215kW@4300rpm, 1:1,52 Speed: 34kn

RIB C740 Manufacturer: Boomeranger Boats Type: Patrol boat Length: 7,4m Beam: 2,75m Displacement: 2,7t Engine: Yanmar 6LYA-STP 250kW@3300rpm, 1:1,128 Speed: 38kn

References

RIB C680 Manufacturer: Boomeranger Boats Type: Patrol boat Length: 7,05m Beam: 2,6m Displacement: 2,2t Engine: Steyr MO306, 215kW@4300rpm, 1:1,52 Speed: 37kn

References

References

AQUATRUCK Manufacturer: Plastic fabrications Pty. Type: Work boat Length: 8,9m Beam: 3m Displacement: 3,8t Engine: Steyr MO306, 215kW@4300rpm, 1:1,52 Speed: 26kn

References

Work boat Type: Fishing boat Length: 9,6m Beam: 3m Displacement: 4,5t Engine: Steyr MO306, 215kW@4300rpm, 1:1,52 Speed: 31kn

References

Pleasure boat Type: Wellcraft Nova Length: 8m Beam: 2,6m Displacement: 2,5t Engine: Mercruiser 496HO 312kW@4600rpm, 1:1,57 Speed: 44kn

References

HTech A25 CAB Manufacturer: HT-Engineering Type: Work boat Length: 7,95m Beam: 2,85m Displacement: 2,7t Engine: Marine Diesel VGT450 336kW@3500rpm, 1:1 Speed: 42kn

References

Stinger 760 Type: Fast rescue boat Length: 7,96m Beam: 2,86m Displacement: ~2,5t Engine: Marine Diesel VGT450 336kW@3500rpm, 1:1 Speed: ~47kn

References

Silverbreeze 8,5m tender Type: Work boat Length: 8,5m Beam: 2,8m Displacement: 2,7t Engine: Marine Diesel VGT450 336kW@3500rpm, 1:1 Speed: 45kn