UltraJet Application Guides
Waterjet Specification & Jet-Boat Design Guides
Information and concepts to aid the successful application of UltraJet propulsion systems.
While waterjets from different manufacturers may look similar, they often have different operational attributes. Waterjet attributes should be matched to the hull design, and mission requirements. The following documents provide considerations when specifying waterjets.
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 harmonious operation of four elements: Mission, Hull, Power Source, and Propulsor (waterjet). This document explores design and operation considerations for each element based on our experience, the experience of various boat builders and jet manufacturers, various technical papers, and other sources.
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Specification Considerations For Marine Waterjet Propulsion
Many times the specification of a waterjet-propelled boat is based only on maximum speed at full throttle in calm water. However, in the real world, engine manufacturers want 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 also specify boat performance at cruise throttle in less than ideal conditions.
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Preliminary Waterjet Selection Based on Power Absorption
The engine power is often the first consideration for jet selection. However, the boat displacement is equally, if not more important. The power to weight ratio of the boat will primarily determine the speed of planing monohull. Then select a waterjet model that will absorb the available engine power, without cavitation, at the estimated maximum boat speed AND at lower throttle settings in difficult sea conditions.
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Nacelles For Optimizing UltraJet Propulsion
Nacelles have been applied by a number of boat builders to optimize hulls for waterjet 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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Boat Speed & Power Estimates
If you would like to receive a performance estimate based on your specific hull and power, please complete and send an Application Questionnaire to Marine Jet Power. PDF and online Application Questionnaires available at:
Application Questionnaire.
