Blogopmaak

How does a Jet Thruster work?

Example: Jet Thruster component setup

Jet Thruster makes use of a high power electrical Turbine style Centrifugal water pump. You can use the system as Bow Thruster, Stern Thruster, or in combination to make the full "docking system" Jet Thruster, a unique product in the industry. 


The system works like any other boat thruster: Push the joystick or button to port or starboard, and the boat will move in that direction. 


All parts of the system are made from high quality Stainless Steel 316 or High grade Composite materials, and are certified to meet industrial quality standards.


The Jet Thruster pump draws water thru a 3" or 4" intake on the bottom of the boat, fitted with an isolation ball valve. The powerful pump generates a large water flow, directed thru flexible reinforced rubber hoses by proprietary electro-motive valves. The system works on the principal of low pressure and high flow rate.


The water flow is directed to nozzles which are located Forward and Aft in the boat, just below the water line. From this nozzle the water jet will exit the nozzle, and push the boat into the direction of choice. The size of the outlet nozzles allow for placement at the extreme ends of the bow and stern, maximising efficiency.


Without the need for specialized fiberglassing, any skilled or DIY technician can install the Jet Thruster in virtually any pleasure yacht on the market. 


With four models of Jet Thruster, our systems are normally installed to 25-60Ft yachts, but can be scaled to virtually any size vessel.

Jet Thruster advantages

By using a 2-way pump outlet, you can have a bow and stern Thruster with a single Jet Thruster pump unit


The pump unit can be placed everywhere, as long as it is below the waterline (you need min. 30cm draft for the pump position)


High Quality Bronze impeller, no cavitation, no more stuck objects in a tunnel or propellor, and no more loud noises common for traditional thrusters.


Isolation Ball Valves allow complete maintenance of system while in the water


No more Epoxy or fiberglas work needed, just use a common PU-Sealant such as Sikaflex 291i to glue thru hull fittings together. 

Small 65mm Composite thru hull nozzle’s which can be placed maximum aft or forward

Flexible hose, gives you many installation possibilities.


All thru-hull fittings are ISO 9093 and ABYC Certified! A perfect solution for, shallow draft boats, catamarans, and wooden yachts. By far more easy to install compared to a conventional tunnel or retractable thruster


A Jet Thruster does not have vulnerable moving parts, and less maintenance than any other thruster system on the market.The required maintenace can be performed by any technician or skilled owner and is limited to exchanging the Zinc anode periodically. 

Water Jet

Where conventional thrusters displace a volume of water with use of a propellor, a jet thruster makes use of a centrifugal pump. The advantage of working with a pump lays in the flexibility towards pump placement inside the boat. 


Because the electrical motor of a tunnel thruster must be on top of the tunnel tube, automatically the installation is limited. A jet thruster pump unit however can be placed anywhere in the boat. The water flow is transported thru a reinforced flexible hose to the bow and stern. This offers great installation fflexibility. 


Not every boat has enough space for tunnel thruster equipment. Now there is a great alternative. The principle of a centrifugal pump is relatively simple. Thru the inlet, a volume of water enters the pump. The closed impeller slingshots the water in outward motion, causing an increaded  pressure. From the discharge nozzle, the water is transported to the directional valve which selected the exit of the water to the port, -or starboard nozzle




Product quality

Salt water and marine environments are highly corrosive. Only specialized metals can withstand these conditiond. The pat years the boating industry has discovered that modern plastics are highly suitable to long-term withstand the (corrosive salt water) elements. Materials and parts, manufacturerd from a technical product called Nylon (Poliyamide) reinforced with glass power, offers a great alternative for metal and even bronze parts. 


Especially thru-hull parts, in direct contact with (Sea) water, are subseptical for corrosion related issues such as crevice and electrochemical corrosion, often induced by stray-currents found near boat, by faulty connections such as shore-power connections which can "leak" energy in the water. Besides Stray-currents, barnacles will settle on metal flanges, and cause damage. To prevent barnacle growth, aggressive environmental unfriendly chemicals are used as antifouling, and applied directly on all thru-hulls, causing potential problems. 


Studies have showed, composite materials such as the Poliamide parts, injection moulded in the right quaility and thickness, result in a long lasting, great alternative. As they are non-conductive, and completely un-affected by salt water, they offer a long lasting and safe alternative. Jet Thruster thru-hull parts are injection moulded from these composites and offer peace of mind towards the corrosion topic of thru-hulls. As part of the CE and ISO norms all parts were subject to a survey by a notified body, tested and approved for use in the pleasure boat industry.  

More info

By Pieter Cats 22 Mar, 2024
Next level Bow Thruster for wooden (classic) boats
A jet thruster nozzle visible in a wooden boat
By Pieter Cats 14 Feb, 2024
Cruising with Talamod on the busy waters around Dordrecht offers both relaxation and challenges. Docking a boat can be particularly tricky due to factors like wind, tide, and navigating tight spots. While some may argue that thrusters are unnecessary and one should simply learn to sail properly, the practical benefits of thrusters are undeniable. As a captain for a Dutch boat tour company operating in bustling Dordrecht, I've experienced firsthand the importance of thrusters in ensuring safe and smooth navigation. With constantly changing conditions and the need for precise maneuverability, thrusters play a crucial role in minimizing risks and enhancing the guest experience. Jet Thruster systems provided by Holland Marine Parts have been instrumental in our operations. These systems offer precise control, especially during docking maneuvers, and are particularly suited for classic wooden boats like Talamod. Their quiet operation ensures a serene experience for guests and residents alike.
By Flush installtion of Jet Thruster nozzles 11 Aug, 2022
Creating a flush and stealth Nozzle install
By Pieter Cats 06 Jul, 2022
Proprietaire d'un Oceanis 31
By info 12 May, 2020
Jet Thruster offers great and flexible Thruster solutions for Jeanneau Yachts. But there is more! Why does a Charter Companies like Boomerang Charter in Sardinia, Italy choose for Jet Thruster? The answer is all about performance and reliability. With almost every weekend a crew-change, there is not much room for maintenance during the busy season. It's super easy to catch a mooring line with a conventional bow thruster. Let's not even mention a Retractable Thruster. These thrusters are very vulnerable, and any damage results into unwanted time consuming repairs during those few hour a Charter Operator has time to change the crew. Jet Thruster however has NO moving parts in the water. The water will pass a small filter. No lines can be sucked into the pump unit. At the nozzle section, only 2" holes are present. From these nozzles, the water is pushed out by the pump. Nothing can get into the nozzle as there is no suction here. The pump inlet is located deep under the water line. The grate prevents debris, plastic and those floating mooring lines from coming into the system. All of this makes a Jet Thruster offers a high level of security and less in-season maintenance jobs for Charter crews.
Verification of Bow Nozzle angle at a Jeanneau Sun Loft 47
By info 11 May, 2020
Designed to use in a Salt water environments, Jet Thruster thru-hull parts are available in high strength Composite. Over the years, use of composite material in the boat building industry has increased spectacular. A quick look during a boat show, will show many boat builders have changed from metal thru-hulls into composite equivalents. The reason is obvious: Durable, easy to install and 100% corrosion resistant. In order to comply with the ISO-9093 and ABYC regulation Holland Marine Parts, manufacturer of Jet Thruster, comes forward with a full composite product line of Jet Nozzles, water inlets and a variety of other parts to connect the very flexible to install Jet Thruster for boats from 25-60 feet. Composite Thru-hull parts offer peace om mind for the boat owner. After a correct installation, salt water has no effect on the parts. Anti-Fouling can be painted directly over the parts. During the injection moulding process, UV proof Composite material is reinforced with a certain amount of glas filament. The result is a ultra strong, shock and impact resistant material. The car industry already discovered composites many years ago. Jet Thruster systems are designed for the heavy use often seen in Charter Boat industry. Reliability is a very import topic. Due to the continuous use of the charter boats, and short service time, available between changing of the guest, there is a demand for technical equipment with a minimum service-level. With no moving parts in the water, no mooring-lines can be caught by the thruster. Mooring lines floating in the Charter base marina's are the no. 1 reason, traditional propellor bow thruster will fail. No with Jet Thruster. Lines are not able to enter the pump unit. During the past years we have seen a strong increase of Charter Companies all over the world. Renting sailing yachts is more popular than ever. During their vacation, Jet Thruster offers captains of Charter boats to safely and comfortable dock the boat, knowing no external debris, lines, or plastics, floating in the water can harm the Jet Thruster With a Jet Thruster, boat builders, Charter fleet operators and private boat owners install a unique thruster system designed for demanding use. More info at www.jetthruster.com Pieter Cats, Holland Marine Parts
Share by: