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Excellence in Custom Marine Equipment and Propulsion Systems


Innovative Technologies

                                                                                                    ...custom built propulsion and machinery for XXI Century Superyachts


    BENTLEY MARINE is the world leader manufacturer and integrator of innovative custom built ship machinery and equipment with well proven aerospace and naval military technologies, making yachting an even more rewarding experience!


    At BENTLEY MARINE we are committed through our continuous Research and Development and by a Global Team of experienced engineers, selected suppliers and manufacturers, to integrate the most innovative and reliable naval propulsion and machinery solutions in the industry.

  The world leaders in Green Yacht Technologies!

Mini Turbine CHPC (Combined Heat, Power & Cooling) GENSETS:

    BENTLEY MARINE exclusive low noise, vibration and smoke free mini turbine generators are about 20% of the weight and size of conventional Diesel generator sets. The mini turbine generators are packaged in sound proof boxes and are microprocessor controlled for best efficiency. Captains will be surprised when they learn that those units are almost maintenance free, requiring an oil change of few quarts of synthetic oil once a year and that their next overhaul is 40,000 to 75,000 hours away.

    BENTLEY MARINE custom builds environmentally friendly "clean burn" low NOx CHPC generators of 30kW, 50kW, 60kW, 70kW, 80kW, 100kW, 200kW, 400kW and 500Kw. They are the most lightweight, vibration free and reliable marine generators in the world. With up to 80% efficiency and 99% availability BENTLEY MARINE CHPC Mini Turbine Generators are smoke free, provide pressurized hot water to the entire Yacht and even Air Conditioning. They are designed to run on either LNG (Natural Gas) or Diesel.


    BENTLEY YACHTS come factory equipped with BENTLEY MARINE special computer controlled shore power that automatically converts, stabilizes and regulates all  frequencies and voltages from any country or port in the world to the one of your yacht. Dock anywhere in the world with peace of mind confidence that your sensitive boat equipment will be safe from power surges and failure. A state-of-the-art custom made switchboard automatically controls the load on the generators turning them on and off automatically when necessary.

External Combustion Stirling Cycle CHP GENSETS: 

   As an alternative to CHPC Mini Turbine gensets, BENTLEY MARINE also offers ultra-compact 50kW genset units based on external combustion engines. The Stirling Cycle engine technology is mostly used in advanced military submarines, because contrary to reciprocating engines, they use 50% fewer moving parts, being much more reliable and operating almost in complete silence, with no vibration and smoke free. BENTLEY MARINE external combustion gensets are virtually maintenance free, requiring an oil change every 5,000 hours. The environmentally friendly gensets can burn a variety of fuels, including Diesel and LNG. Multiple units can be installed to work in parallel in larger yachts. The units can be assembled as CHP (Combined Heat & Power), thus providing hot water for the entire yacht at a constant 60 C.

External Combustion Stirling Engine


Advanced Propulsion Systems:

    BENTLEY MARINE's custom ultra-lightweight Aluminum Diesel Engines, Turbines and compact Gearboxes  are integrated in unique propulsion packages that sets up new standards  in superior maneuverability, reliability and comfort at sea.


4, 5 & 6 Speed Electronically Controlled Automatic Transmissions:

    If your car has a multiple speed gearbox to allow its engine to efficiently deliver its power to the wheels through the entire RPM range and load, why doesn't your boat has a multiple speed automatic gearbox to optimize the power delivery to the propellers or water jets?

 BENTLEY MARINE is the first and only company to package custom multiple speed electronically controlled gearbox in the yacht industry, so that you now can maximize the fuel efficiency of your boat by efficiently delivering all the power of your engines to the propellers at all RPM and boat speeds. Now you can have less installed HP onboard, get on plane quicker and cruise at high speeds at lower engine RPM's for unmatched fuel efficiency and longer engine life.


    Available for small to large yachts in several configurations and HP ranges.


Infinite Ratio Hybrid-Electric Transmissions:

    The ultimate gearbox for small and medium size yachts with under 1,000HP!  BENTLEY MARINE integrates an Infinite Ratio Hybrid-Electric Transmission that is a lightweight and compact unit that combines the Diesel engine mechanical power with a built-in 150kW (200HP) electric motor power for maximum efficiency throughout the entire engine RPM range and speed of the vessel. The result is up to 60% better fuel efficiency!

    While the revolutionary infinite ratio gearbox provides always the correct optimum engine torque at the propellers and water jets without the need of changing gears, the 200HP electric motor, which can also be doubled as a 150kW generator, automatically provides the extra power and torque needed when getting the boat on plane, thus allowing for less total installed HP onboard and even better overall fuel efficiency.

 The system can be configured so that the electric motor can be used momentarily running on special high capacity batteries for docking and port maneuvering without the need of having the main Diesel engine running.


Gearless Hydraulic Propulsion Systems:

    How would you like to be able to control the propeller RPM of your boat with precise 1 RPM increments and yet deliver the full engine power at any RPM and shift the boat from forward to reverse at any speed without the risk of breaking the gearbox into pieces, or yet run both propellers with one single engine for maximum efficiency and in case one of your engines fail?

    BENTLEY MARINE integrates custom built electronically controlled Hydraulic Propulsion Systems up to 1500HP per shaft that completely eliminate the need of a gearbox and can deliver all installed engine power instantaneously to the propellers, thus allowing the boat to get on plane faster than any other mechanical drives.

Since there is no gearbox, no more clicking when shifting from forward to reverse and vice-versa or clutch wear when trolling at low maneuvering speeds. The Diesel engines drive hydraulic pumps, not your propeller shaft, which is driven by ultra compact high torque electronic controlled hydraulic motors.


Step into the future of yachting with a Gearless Hydraulic Propulsion System!


Hydraulic Engine Couplers and Transmissions:

      BENTLEY MARINE offers a complete range of Hydraulic Engine Couplers and Transmissions that prolong the life of the Diesel engine and shaft line by providing a smooth and controlled transfer of power, impossible with direct drive systems.

    The custom built hydraulic engine couplers are designed and engineered for the specific engine and application and serve to either connect the engine into a conventional gearbox (all our automatic gearboxes above come with built-in turbine hydraulic torque converters) or in between the gearbox and the shaft line to smooth the transfer of power an prolong the life of mechanical components in the yacht's drive train.


    Hydraulic Transmissions are similar to torque converters, but can be sophisticated enough to control the shaft speed and torque in accordance to propeller load and engine RPM, thus in some cases eliminating the need of a gearbox and serving as the only link between the Diesel engine and the propeller or water jet shaft.


    Both Hydraulic Engine Couplers and Transmission are also used in Turbine propulsion applications of up to 36,000HP.


Utra-lightweight Aluminum V-12 and Radial Diesel / LNG Engines:

    BENTLEY MARINE Custom Aluminum Diesel Engines come in V12  (up to 1100KW/1500HP) and in the exclusive Radial configurations in 42,  56 and 112 cylinders (up to 7000KW/9380HP). Those are one of a kind military developed and well-proven state-of-the-art machinery, not your standard industrial mass produced marinized behemoth!

    The most powerful, lightweight  and compact Marine Diesel engines available today can also come equipped with built-in advanced aluminum gearboxes (another exclusive in the industry) for maximum weight and space savings and outstanding performance and reliability. All engines can be ordered with right or left rotation for a perfect balanced installation.


BENTLEY MARINE 42Cylinder Radial Aluminum Engine with built-in compact gearbox (4000HP) shown.


Compact Turbine Power & Custom Gearboxes:

Click on Turbine for more info

    BENTLEY MARINE's multi-stage high efficiency marine gas turbines are rated from 500kw/670HP to 26.7MW/35,800HP. When coupled to our integrated ultra-compact aluminum gearboxes, they eliminate all vibration and noise aboard the yacht, yet substantially increasing its performance over any Diesel engine with significant weight savings and over 20 times longer TBO's! They are engineered to operate on Diesel or LNG-Liquefied Natural Gas and can be custom packaged with any of the propulsion systems below for best performance.

Step into the future of yachting propulsion!






Ultra Lightweight (350Kg) & Compact Aluminum Gearbox for
BENTLEY MARINE 4MW (5360HP) ST- Super Turbine Series.


ST- Super Turbine Series 4MW (5360HP) Aluminum Gas Turbine (500Kg)

    BENTLEY MARINE 4MW/5360HP - 850Kg Turbine and Gearbox package weights about 7 tons less than piston Diesel engines of comparable power and about 3 tons less than any other marine gas turbine package of the same power. This ultra lightweight system translates into more boat speed, with more useful interior space and longer cruising range, since you have space to carry much more fuel. Contrary to piston Diesel engines, BENTLEY MARINE gas turbines never smoke, can be started and run at full power in less than one minute and require ten times less maintenance, reducing operating costs.

New High-Efficiency Ventilated Water Jets (VWJ):

Externally Mounted VWJ

Hull mounted VWJ design


Developed by the BENTLEY MARINE Team of propulsion specialists for a leading European Navy, the Ventilated Water Jet is specially attractive for high-speed vessels and as a more efficient alternative to conventional water jets in Air Cavity hulls, where cavitation must be avoided.

   This propulsion device consists of a slightly curved water inlet of minimum length with  a special designed impeller placed directly on the shaft at the outlet right behind the carrier-bearing strut. Contrary to conventional water jets, there are no speed limitations and they operate efficiently through the entire speed range.

   BENTLEY MARINE Ventilated Water Jets can be designed to be either built into the hull or, externally mounted.















New Water Jet Control Systems:

    This sophisticated single lever control system controls thrust direction in 360, the clutch, engine RPM and pitch control. It can also be interfaced with all other BENTLEY MARINE ship's control systems such as autopilot, dynamic positioning and integrated bridge system.

    The integrated joystick also controls BENTLEY MARINE exclusive 360 steerable bow and stern water jet thrusters.



360 Steerable Bow and Stern Water-Jet Thrusters:

360 Steerable Bow or Stern Mounted U-Shaped Water Jet

    Another exclusive from BENTLEY MARINE are the compact and lightweight 360 steerable bow and stern water jet thrusters which, contrary to conventional propeller thrusters, are quiet and vibration free. The custom-built units are joystick controlled and make the docking of a large yacht a snap! The units can be powered by lightweight Next Generation Intelligent Modular Electric Drives shown herein below or hydraulic motors depending on the yacht.

360 Steerable Stern Mounted Water Jet /Rudder Combo

    The newly developed  stern mounted Water Jet /Rudder Combo is an ingenious solution from Superyacht developer and integrator, John F. Rodrigues. When used with our High-Efficiency Ventilated Water Jets, the system works as a rudder for medium and  high-speed cruising or, as a 360 steerable water jet thruster and low speed propulsion for precise docking and maneuvering.


Dynamic Positioning and Position Mooring Systems:

    BENTLEY YACHTS are the first and only Superyachts to come equipped with Dynamic Positioning and Position Mooring Systems.
    The system combines DGPS technology for positioning, gyros, wind sensors, depth sounders, navigation computers and BENTLEY MARINE compact 360 Steerable Bow and Stern Water Jet Thrusters or Cycloidal Rudders to keep the vessel still in a pre-determinate longitude and latitude without the need of mooring (dropping anchor). It is also used with the autopilot to keep the yacht in precise heading or follow course.


Cycloidal Rudders:

vcr_2.jpg (12286 bytes)

   Cycloidal Rudders are a brand new revolutionary concept that incorporates directional rudders, a 360 steerable propulsion system and a pitch and roll motion control system; all in one single unit!

   Cycloidal Rudders can be installed to work in dual mode on twin screw yachts, by having the units installed forward or aft of the propellers (conventional, variable pitch or Ventilated Water Jets), thus working as a high performance rudder at higher speeds and as a vectored 360 thruster and propulsor at lower speeds. When the yacht is at rest, it also works as a much more efficient motion control system than ordinary fin stabilizers, providing a vertical controlled thrust that pushes the starboard or port bottom of the hull up to compensate for roll and pitching.  A 20 Knot Yacht can be designed using Cycloidal Rudders as the only main propulsors, eliminating the need of conventional propellers, bow and stern thrusters.



CP (Controllable-Pitch) Speed Z-Drive pulling propeller with built-in gearbox and rudder:

     Those performance units are rated up to 5000HP and incorporate compact built-in gearboxes with controlled pitch pulling propellers and rudders. Speeds over 50Knots are possible with this system which are installed with the propellers facing forward to benefit from superior hydrodynamic flow and higher efficiency of "pulling type" CP propellers. They work in perfect harmony with BENTLEY MARINE Diesels & Turbine packages, and are standard equipment for BENTLEY YACHTS 110ft Galaxy and 146ft Ocean Course Hydrofoils. Keeping the gearbox out of the vessel's interior, under the water, means quieter operation and a vibration-free yacht.


Steerable Azimuth Thrusters with Contra-Rotating Propellers:

    Those performance electronically controlled contra-rotating Z-Drive units are ideal for large displacement Superyachts, offering 15% better efficiency than conventional propellers and precise 360 maneuverability.  They can be packaged with BENTLEY MARINE's Aluminum Diesels & Turbines or with our Diesel-Electric, Turbo-Electric and hydraulic propulsion solutions.



Racing Surface Drives:


    The ultimate custom racing surface drives MK-I and MK-II are the drivers of choice for the 50ft, 100MPH  BENTLEY Yachts Sport Veloce. and 32ft BENTLEY Yachts TT - Titanium Tender Hydrofoil

  Main Characteristics of this exceptional racing drive include:
- Integral Dry Sump System for better efficiency and cooler operation.
- Steerable and trimable.
- No bevel gears, only spur gears for quick change of ratios.

Innovative Cavitation Free Super-Propellers:

  BENTLEY MARINE military propeller specialists and laboratory have developed a new type of propeller which has 4-6% better propulsive efficiency in the 30-60 Knot range when compared to the most modern propellers or water jets available. Depending on the yacht type and dimensions it may save up to 1,000 tons of fuel a year. The design features a 15% increase in diameter and reduced blade area. The elimination of cavitation reduces about twice the pressure pulse level at hull skin which translates in reduced hull vibration and better comfort. The Cavitation Free Super Propeller may  also be used on slow speed displacement vessels with even better efficiency.



Controllable Pitch Propellers:

     Hydraulic controllable pitch propellers are used in some BENTLEY YACHTS applications, such as some Hydrofoil designs where Speed Z drives or Water jets cannot be fitted, or would not produce the best performance. In addition to the better use of the engine available power, easy maneuverability is accomplished by keeping the engines RPM fixed at a pre determined speed while varying the pitch controls for precise forward and reverse thrust during dockage. BENTLEY MARINE electronic control module automatically adjusts engine speed in accordance to the variable pitch.


Standard Line, Net  & Weed Cutter:

spurs.jpg (19850 bytes)

    Standard equipment on all propeller driven BENTLEY YACHTS. The cutter is ABS approved and eliminates costly dives to cut prop-fouling lines in freezing or high seas and provide long life to the shaft seal units.


Next Generation Intelligent Modular Electric Drive Systems:

300HP AEPS Motor with integral reduction gear



 AEPS Typical components: Inverter, Drive motor, generator & Control systems

  BENTLEY MARINE is pioneering the integration of a new and revolutionary AEPS - Advanced Electric Propulsion System ™, a  modular electric drive system that makes lightweight Electric propulsion and power on demand a pure reality. The custom designed system is comprised by ultra-compact (10"x 10"x 22"in) and lightweight (120Kg) generators and electric motors, up to 150kW (200HP) each, which are combined as needed in minimalist (12"in) cube gearboxes for the required power. Up to nine units can be combined for a respectable 1350kW or 1800HP. The generator and electric motors are completely sealed and corrosion proof. The units can be independently and easily removed for service. The modular electronically controlled generators are integrated into a single gearbox and bolted into the Diesel engine flywheel, thus enabling power on demand in accordance to the yacht's electrical or propulsion loads. Maximum efficiency is obtained all the time, as one single Diesel engine serves for electricity and propulsion varying its RPM in accordance to the loads. Applications are endless!


Compact Steer-by-Wire Systems:


   BENTLEY MARINE integrates Digital Steering Technology and, in certain applications where the rudder is not part of the propulsion system, compact third generation steering gear units with built-in hydraulic system for simple installation and maintenance are used for very precise and smooth ship maneuvering.


Aerospace Developed Motion Control Systems:

Bow mounted T-foil system

   Fully automatic computerized stabilization systems for monohulls, catamarans, hydrofoils and SWATHs. Each Motion Control System is custom  designed for the specific Yacht, after carefully evaluating the given motions of the vessel through a computer simulation test. Unlike the common pair of hydraulic actuated fins offered in the yacht industry today which can only provide roll control, our aerospace developed systems use avionics software to control roll, pitch, heave and yaw through a series of devices that can include a T-Foil in the bow with a pair of custom vertical trim tabs (Interceptors), an A-Foil Hydrofoil with transom interceptors (10Knot speed increase with this system) or, a set of vertical "Interceptor" trim tabs amidships and at the transom (See our Blade Runner Hull). The Motion Control Systems can be integrated with an autopilot to provide the ultimate precision in navigation.


Fully Integrated Machinery Control, Monitoring and Alarm Systems:

 Touch Screen automatic digital monitoring and alarm system

Say goodbye to switchboards with electronic controlled circuit breakers !

Our aircraft designed touch-screen panels control and monitor all ship systems and integrate all ship controls and monitoring systems, making it possible to control and  diagnose more than 700 equipment in one single screen. A normal installation will use 4 to 5 interactive touch-screen panels for back-up and multi-reading. Custom installations allow crew or guests to access all ship systems from anywhere in the boat, provided they have individual access PIN codes. Another plus of this system is that all data is continuously collected and recorded for easy diagnosis (Black Box) and all ship equipment is wired and inter-connected through a LAN with a single wire harness to the bridge. This saves miles of wiring harness and lots of money in equipment and installation.


Self Contained Fully Integrated Navigation Systems:

Click here for more info


  The BENTLEY MARINE Electronic Chart System  is the only Navy approved, portable and self contained computer navigation system. It comes equipped with its own battery back-up and can be customized and integrated with other ship systems.



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