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NAMJet’s newest innovation is the RaptorJet series. NAMJet is introducing the RaptorJet series with the RJ431 waterjet. NAMJet has combined the proven performance of the TJ431HH and relocated the steering and reverse components inside the hull. The RaptorJet is offered in two configurations, electric actuation or traditional hydraulic actuation of steering and reverse.

The NAMJet RJ431e RaptorJet is operated by balanced, electric actuators controlling steering and reverse. THE RJ431e is designed to be operated by NAMJet’s iNAV Intelligent Navigation and Control system, eliminating the need for hydraulic pumps, oil tanks, filters and potential oil leaks.

For those customers preferring conventional hydraulic operation, we offer the NAMJet RJ431h RaptorJet, with the hydraulic actuators for steering and reverse located inside the hull, eliminating external environmental oil pollution concerns. The RJ431h is designed to integrate with the NAMJet iNAV Intelligent Navigation Control, however, it will also integrate with other control systems as well.

RJ431e

 

  No more hydraulic system / maintenance
  Smooth adjustable ramping
  Fast response, quiet operation
  Fingertip control of lateral movement

 
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RJ431h

 

  Improved Efficiency
  Greater Speed Capability
  iNAV Inboard Electronics
  Full Actuation Redundancy
  Fast Response, Quiet Operation

 
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RaptorJet FAQs

 
What does it mean for the system to have redundancy?

Greater speeds and larger power plants to drive larger jets is not necessarily the best possible solution for wind farm operations. NAMJet’s studies have found that a quad waterjet solution has many advantages over larger twin waterjet operations. Quad waterjets provide full redundancy and with NAMJet’s higher thrust capability and iNAV system, it is possible to power cycle the jets to maximize fuel economy and reduce wear and tear while connected to a wind farm tower.

What makes this ideal for the wind farm markets?

NAMJet’s higher thrust capability and little to zero cavitation provides wind farm crew transfer vessel with a much higher transfer limit window. This means the CTVs can stay engaged longer with the wind farm towers in greater sea state conditions.

Could the implementation of a RAPTORJet be an EPA ‘tier buster’?

Yes, depending on the application and the resistance curve of the vessel versus the performance requirement. Generally NAMJet’s waterjets operate more efficiently and can produce significantly higher thrust than high speed jets allowing for the use of small power plants on some occasions.

How is the RAPTORJet able to provide massive thrust?

Our waterjets are a mass axial flow design which relies on the volume of water passing through the intake. The impeller rotates at a very low speed between 700 – 1150 rpms which is highly efficient in producing enormous thrust and little to no cavitation from idle up to 35 knots.

Why is data logging an important feature?
The data logging provided by the iNAV system is essentially a black box feature which records numerous real time operating parameters. The benefits are fundamental, including accident investigation, and can be a useful training tool. The system can also have predictive maintenance capability which will increase uptime for vessels.
Outside of eliminating hydraulics, what are the benefits of the iNAV system?

Traditionally, the main control box is located in the helm and handles all of the high level commands such as GPS headings, sonar etc. There is also a jet controller located near the waterjets which handles all the lower level commands for steering and bucket control. With the iNAV system, the bundles of cables running down the boat between the waterjets and the helm control panel are eliminate. It is simply connected via an ethernet Cat 5 cable so installation or refit for boat builders is much easier.

How does the iNAV system integrate with navigational hardware?

The iNAV system is a fully integrated electronic control system which is highly compatible with most navigational hardware and sensors. It can be configured as a basic system to control engine throttles, transmission, jet bucket and steering. The iNAV-iN5 system is more advanced and provides joystick control, an intuitive user interface for navigation and full vessel control on a touch screen glass helm. The control features station keeping and dynamic positioning capability, as well as multi-vessel positioning control from a single vessel.

How does the new system create a smoother ride?

Hydraulic systems can very reliable if well maintained but they do have a slight delay in the command signals from the steering and bucket control system. The electric actuation system is instantaneous which allows for smooth, quiet ramping.

What about the demonstration boat?

The 10m demonstration boat was built by Birdon America, Inc in Denver and will be based at a NAMJet facility in the UK and used for various exhibitions around Europe.

Why is it important that RAPTORJet works without hydraulics?

By eliminating hydraulics, operators will no longer need to be concerned with ongoing maintenance of a hydraulic system. There is less weight and more room on board as there are no longer hydraulic tanks, hoses, filters, pumps and valves. It is also eco-friendly in that it eliminates the potential for any oil leaks.

What does it mean for NAMJet to be creating a “sea change?”
The dictionary definition of the term sea change is “a profound transformation” and that is what NAMJet is creating in the waterjet propulsion industry. RAPTORJet is the first waterjet worldwide to provide the option of electric actuation, eliminating the need for hydraulic pumps, oil tanks, filters, plumbing, ongoing hydraulic maintenance and potential oil leaks. RAPTORJet has been specifically designed to accommodate electric actuation however a hydraulic option is also available. This was all made possible through the introduction of our new Intelligent Navigation & Control System called iNAV. The industry has seen very little innovation and change in recent years. The introduction of electric actuation and the capability for autonomous vessel control is the beginning of a profound transformation in technology that will deliver improved thrust and performance.