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HJ-403 designed for diesels to 1200 hp @ 2140 - 2300 rpm - This is the largest HJ series jet and the smallest HM series jet. So there are control options in the HM range that are far superior to those in the HJ series. This jet is frequently found on vessels exceeding 70 ft in length and frequently requires a gearbox to match the engine rpm to the impeller rpm, vessels over 100ft with quad installations and weights to 54,000 kg are not unusual.

General Description

The 403 waterjet Hamilton Jet has released a new waterjet model, the HJ-403, and with it the company has set a new standard in waterjet design, manufacture, and performance. The 400mm HJ-403 replaces the popular HJ-391 model and offers many benefits over other propulsion systems for high speed work and patrol boats with power inputs up to 900kW.

As with all Hamilton waterjets, the HJ403 exhibits excellent high speed and cruising performance and superior cavitation resistance at low speeds and when under loaded conditions. The wide range of impeller options available ensure its compatibility with a variety or engine models, either direct driven or via a gearbox, and the flexibility of the jet unit makes it suitable for many different types of vessel in single or multiple installations.

While basic specifications of the HJ403 are similar to its predecessor, the new model includes several new design features to improve the installation and operation of the jet. It is available in zero or five degree shaft angle options to suit different engine alignments and vessel trim, and the jet features a more compact balanced reverse duct with the same superior zero-speed and reverse manoeuvring performance and lower actuating loads. The latter allows the unit to utilize a single reverse cylinder with faster response times.

The HJ403 is more compact that the previous model, with intake block positioned further aft against the transom, reducing the length between coupling flange and transom, and reducing height from base to fully raised reverse duct. This unit is also lighter than the HJ391.

The jet incorporates Hamilton's highly efficient JT steering system, which minimizes thrust loss when steering to provide superior manoeuvring power compared to other waterjet steering systems. The HJ403 is the first new model to feature stainless steel edge inserts in the stator to reduce wear when operated in abrasive conditions. Installation of the jet is simplified with the unit able to be fitted from inside or outside the vessel.

The HJ403 may be configured for manual hydraulic or power assisted steering, while standard reverse function uses Hamilton's new HFRC Reverse Control System. This servo hydraulic system "de-couples" the reverse control levers from the reverse duct movement whilst providing full follow up control.  It also allows quadruple jets to be controlled in pairs using only two reverse controllers. The HJ403 is also available with Hamilton's MECS Electronic Control System for steering, reverse, throttle, and gearbox control, as well as interfacing to autopilots, and dynamic positioning systems.

All hydraulic components are mounted on and fully integrated with the HJ403 waterjet, including the oil pump, sensors and valves, the oil cooler, and hydraulic steering and reverse cylinders. This eliminates the need for any additional hydraulic tubing or pumps and simplifies jet installation and maintenance procedures.

The HJ403 is the first Hamilton waterjet fully designed in 3D. Finite Elements Analysis (FEA) was used extensively to optimize the strength and weight of the various mechanical components of the jet. The Hamilton Model HJ403 waterjet is designed to comply with all the main classification societies, with approvals other than ABS available on request.

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