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Marine Jet Power - UltraJet

Characteristics of MJP UltraJet

Characteristics of MJP UltraJet

MJP UltraJet waterjet models (100 - 1500 kW) feature:

  • Efficient axial flow pump
  • Strong, light-weight cast-aluminum construction Stainless steel pump components
  • Integrated hydraulics
  • SOLAS configurations available
  • Resistant to damage from grounding and floating debris
  • Safety to personnel in water and protection of marine habitat
  • Improved acceleration, especially for load-carrying vessels
  • Mid-range performance optimized at cruise throttle settings
  • Integrated intake and mounting base for ease of installation
  • Low operation and maintenance costs
  • Lloyds‚ ABS‚ etc. certifications available

Complete the questionnaire to determine the right jet for your application.

MJP Power Ranges

  • MJP UltraJet input power 100 - 1500 kW (130 - 2.000 bhp)
  • MJP CSU input power 1000 - 15,000 kW (1340 - 20,000 bhp)
  • MJP DRB input power 500 - 2500 kW (670 - 3,350 bhp)

The MJP Aqua Jets are suited to high-speed vessels operating in the 20 to 50 knot range. MJP also offers models optimized for displacement and semi-displacement craft.

Product Range


  • MJP Ultrajet 251-340

    MJP Ultrajet 251-340
    • 350 up to 600 HP
    • Power Range 100 - 450 kW

    MJP UltraJet 251

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    • 354 MHP, 350 BHP, 261 kW
    • 250 mm / 9.8 inch impeller

    MJP Ultra Jet 251 HT

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    • 370 MHP, 364 BHP, 275 kW
    • 250 mm / 9.9 inch impeller

    MJP UltraJet 305

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    • 456 MHP, 450 BHP, 335 kW
    • 305 mm / 12.0 inch impeller

    MJP UltraJet 305 HT

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    • 400 MHP, 394 BHP, 298 kW
    • 340 mm / 13.4 inch impeller

    MJP UltraJet 340

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    • 608 MHP, 600 BHP, 448 kW
    • 833 mm / inch impeller

    MJP UltraJet 340 HT

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    • 550 MHP, 542 BHP, 410 kW
    • 926 mm / 36.46 inch impeller
  • MJP Ultrajet 377 - 575

    MJP Ultrajet 377 - 575
    • 800 up to 1800 BHP
    • Power Range 500 - 1,500 kW

    MJP UltraJet 377

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    • 811 MHP, 800 BHP, 597 kW
    • 926 mm / 36.46 inch impeller

    MJP UltraJet 410

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    • 1013 MHP, 1000 BHP, 746 kW
    • 926 mm / 36.46 inch impeller

    MJP UltraJet 452

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    • 1216 MHP, 1200 BHP, 900 kW
    • 450 mm / 17.7 inch impeller

    MJP UltraJet 525

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    • 1495 MHP, 1475 BHP, 1100 kW
    • 525 mm / 20.7 inch impeller

    MJP UltraJet 575

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    • 1825 MHP, 1800 BHP, 1342 kW
    • 575 mm / 22.6 inch impeller

MJP UltraJet Control Systems


MJP UltraJet Control Systems

The MJP-UltraJet Hydro mechanical and Electrohydraulic control systems offers complete control of vessel maneuvering by controlling steering, reversing, side movements, rotation or crash stop. The four primary MJP UltraJet control systems cover a wide range of application requirements.

Hydro mechanical (HM) Control

The Hydro mechanical reversing control provides proportional operation of the reversing deflector (bucket) when actuated by a push/pull cable from the helm. The HM control converts minimal effort at the helm to hydraulic actuation of the reverse deflector, even at full throttle. The HM control is available for the MJP UltraJet models 251, 251HT, 305, 305HT, 340, 340HT, 377, and 410.

Electrohydraulic Proportional (EHK) Control

The economical Electrohydraulic Proportional Control operates the reversing deflector proportionally to helm lever movement. The EHK system is utilizes components from Kobelt's durable ship rudder control. The reversing deflectors are actuated at the helm with single or twin-lever helm units.

JetMaster-Pro Electrohydraulic (JMP) Control

The economical Electrohydraulic Proportional control operates the reversing deflector proportional to helm lever movement. The EHK system is utilizes components from Kobelt's durable ship rudder control. The reversing deflectors are actuated at the helm with single or twin-lever helm units.

JetMaster Joystick Electrohydraulic (JMJ) Control

Ultra Dynamics, formerly Ultra Hydraulics, have supplied joystick controls for vessels since 1995. These Ultra-developed joystick systems are used to accurately control forward, reverse and neutral positioning of the boat using vectored thrust from the jet drive(s). The JetMaster Joystick controls are available for all UltraJet models. The control system provides excellent maneuverability in all directions including rotation around boat center and sideways movement for docking.

JetMaster Wind farm Service Vessel (JMWFSV) Control

The JM Wind farm Boat control system has been developed for the unique operating requirements of wind farm service boats.

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MJP-UltraJet Application Guidelines


MJP-UltraJet Application Guidelines

While many water jets look similar, each brand and model has different operating functionality. Water jet attributes are best matched to the hull design, and application requirements.

The following documents provide more information about the range of water jets available to support application specification.

  • Jet-Boat Design Considerations

    This PDF document provides a systemic approach for successful application of marine waterjet propulsion. Similar to other propulsion methods, a successful waterjet-propelled boat requires the operation of four elements in union; Mission, Hull, Power Source, and Propulsion (water jet). This document explores design and operation considerations for each element based on our experience, the experience of various boat builders and jet manufacturers, technical papers, and other sources.

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  • Specification Considerations for Marine Waterjet Propulsion

    Often, the specification of a waterjet-propelled boat is based only on maximum speed at full throttle in calm water. However, engine manufacturers need their engines to run at less than full throttle; boats become heavier in service, and the boats need to operate in less than ideal sea and wind conditions. Jet selection should always incorporate boat performance at cruise throttle in less than ideal conditions.

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  • Nacelles for Optimizing UltraJet Propulsion

    Nacelles have been applied by a number of boat builders to optimize hulls for water jet propulsion in single and twin-jet monohulls and catamarans. The nacelle concept is especially useful to adapt hulls not normally considered suitable for waterjet propulsion.

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  • UltraJet Installation in Aluminum Hull

    Step-by-step photo description on the preparation and installation of UltraJet propulsion in aluminum hulls with single or twin UltraJet units.

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  • UltraJet Installation in Fiberglass Hull

    Step-by-step photo description on the preparation and installation of UltraJet propulsion in composite hulls with single or twin UltraJet units.

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Video Gallery


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MJP Ultrajet Spare Parts & Factory-Authorized Services


  • MJP Utrajet Spare Parts

    • Dedicated Marine Jet Power Team of Specialists
    • Close Partnership with Marine Jet Power with full access to the supply chain
    • Extensive Marine Jet Power spare parts inventory
    • Competitive pricing and minimal turnaround times
  • Marine Jet Power Spare Parts

    Marine Jet Power Spare Parts

    Find out more about our extensive spare parts inventory.

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  • Factory-approved MJP Utrajet Service

    • Short turnaround times for emergency service in the Americas
    • Factory-trained and experienced technicians
    • Installation of complete units
    • Retrofits and upgrades of existing equipment
  • Marine Jet Power Service

    Marine Jet Power Service

    Find out more about our engine and auxiliary services.

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Contact us for more information about MJP UltraJet, CSU and DRB

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