HJ Series Brochure
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The HamiltonJet Promise HamiltonJet HJ Series waterjets represent the most successful range of waterjet propulsion units available in the world today. Proven over many years to perform in all operating conditions, the HamiltonJet HJ waterjet range provides superior thrust, efficiency and cavitation performance over other similar sized waterjet models. Total Waterjet Solutions With experience spanning six decades, HamiltonJet provides a totally integrated waterjet propulsion solution to the marine industry. From initial enquiry and right through the lifespan of a vessel, HamiltonJet offers a...

The Waterjet Advantage As vessel speed increases waterjets become more efficient compared to conventional propeller systems. Efficiency benefits are due to… • No appendage drag – the waterjet intake sits flush with the hull bottom without struts, propeller shafts, rudders or any elements protruding beneath the hull to increase hull resistance, particularly as speed increases. • Thrust generated by a waterjet is parallel to the direction of travel. For many propeller systems the shaft is angled down and thrust is generated in the direction of the shaft, so only a component of the total...

The HamiltonJet Difference Performance High speed performance and efficiency – advanced impeller and intake designs provide peak efficiency and performance over a wide speed range. Low speed performance – high thrust at low speeds ensures excellent station-keeping, bollard pull, load carrying and manoeuvring. Acceleration – ability to apply full power at lower speeds ensures fast acceleration for patrol boats, rescue craft, pilot boats and recreational vessels. CONTROL Steering control – HamiltonJet’s JT steering system out-performs all others, reducing thrust losses when steering to give...

HamiltonJet Features Integral jet-driven hydraulic pump and control system (JHPU) assembly. No need for additional pumps and plumbing to be fitted. Inboard thrust bearing assembly transfers thrust forces to intake block and hull bottom, not transom, so no additional hull or transom reinforcing is required. All hydraulic components are mounted inboard where they are protected from corrosion and marine growth . Driveshaft coupling flange. Can be direct driven or connected via a gearbox. No difficult engine alignment problems. Intake block, including protective screen bars, is supplied ready...

Steering tiller. Transom seal (supplied). Impeller race is lined with a replaceable stainless steel wear-ring to protect the housing when operating in silt-laden water. Split-duct ahead/astern deflector diverts water down and to each side to prevent recirculation and maximise both reverse and lateral thrust. JT steering nozzle reduces thrust losses when turning. Zinc and Aluminium anodes provide extensive internal and external cathodic protection. Aluminium construction offers best mix of light weight, strength, corrosion resistance and cost. All internal moving and wearing components are...

Hamiltonjet HJ Series Dimensions The HJ Series comprises a range of highly efficient waterjet units suitable for propelling craft at speeds ranging from zero to up to 50 knots and typically of length up to Z0 metres. Jet Model A B C D E F G Intake Block Dry Weight Entrained Water NOTES: Input RPM are subject to suitable cavitation limits - lower RPM figure is always preferred. Higher power inputs will restrict input RPM range. a - HJ212 "A" dimension is to the end of a splined shaft. May be close coupled. Weight based on standard 5° Intake Block option. Contact Hamiltonjet for weights of...

HamiltonJet HJ Series Power / RPM Curves 1000 Input RPM subject to suitable cavitation limits – lower RPM figure is preferred. Higher power inputs will restrict input RPM range. RPM (at Waterjet) Note: Waterjet selection is determined by a range of hull and operational factors, most importantly vessel size and displacement (weight), and not necessarily by matching the above specifications to the desired engine power/RPM curve. In all cases you should consult HamiltonJet for assistance with waterjet selection.

HamiltonJet Operation JT Steering All HJ Series waterjets incorporate HamiltonJet’s JT steering nozzle to optimise both steering efficiency and delivery of propulsive thrust. Compared with other waterjet steering systems, the JT nozzle provides outstanding steering response at all boat speeds. This is particularly noticeable at low speeds due to the absence of a central “deadband”. The design reduces nozzle flow disturbance, resulting in lower energy losses and minimal loss of forward thrust when steering. These factors mean higher overall efficiency through improved course-keeping and,...

HamiltonJet Suitable Hull Form Guidelines This page provides basic information to assist when determining the suitability of waterjet propulsion for different hull forms, vessel applications and performance expectations. General Guidelines The hull shape, monohull or multihull, should be that which best suits the size, displacement and cruising speed of the craft, but with the following prerequisites: • Hull shape and appendages must avoid entraining air into the waterjet inlet. • If no keeling is proposed, hull shape must be directionally stable without such appendages. Strakes inside...

Detach along perforation Detach along perforation Hull Construction Material: Vessel Speed with Continuous Power Input (knots): Include LCG for each displacement state if known Displacement: Maximum: ❑ Nett Flywheel Power (ie: before gearbox, etc) or ❑ Nett Shaft Power (ie: waterjet input) ❑ No/Direct drive ❑ Yes, Make & Model: Ratio: :1 Complete this form, then return to your local HamiltonJet Distributor or Regional Office by email, fax or post. See back page of this brochure for contact details. This questionnaire is also available in electronic/email format from www.hamiltonjet.co.nz. *...

WORLD HEADQUARTERS HamiltonJet Global PO Box 709 Christchurch New Zealand Phone: +64 3 962 0530 Fax: +64 3 962 0534 Email: marketing@hamjet.co.nz www.hamiltonjet.co.nz REGIONAL OFFICES HamiltonJet Americas 14680 NE North Woodinville Way Suite 100 Woodinville WA 98072 United States of America Phone: +1 425 527 3000 Toll Free: 800 423 3509 Fax: +1 425 527 9188 Email: marketing@hamiltonjet.com www.hamiltonjet.com HamiltonJet Europe Unit 26, The Birches Industrial Estate East Grinstead West Sussex RH19 1XZ United Kingdom Phone: +44 1342 313 437 Fax: +44 1342 313 438 Email:...