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Thrusters
SE210 tunnel bow/stern thruster 24V
210kg thrust, on/off
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Q-PROP™
The Q-PROP™ has measured noise reductions of up to 75% in controlled environments. The five-bladed skew propeller reduces noise levels while maintaining exceptional efficiency. Some thruster models even see an increase in thrust power.
- The expected noise reduction in average installations: 20-40%
- Upgrade kits are available for most Sleipner thruster models with special adaptors
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INTELLIGENT POWER CONTROL
Sleipner's patented intelligent power control provides a minimal delay between drive directions to reduce wear of the mechanical parts while monitoring solenoid functions. In the case of a solenoid lock-in, the thruster will automatically stop without extra user action or controlling the main switch.
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OVERHEAT PROTECTION
When high temperatures are detected, On/off thrusters are automatically shut off to prevent overheating. PRO™ thrusters with speed control provide extended run-time by derating power to maintain temperature within safe levels.
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FLEXIBLE INSTALLATION
Sleipner offers installation flexibility to work with the space you have. Our thruster models allow installation at any angle on the tunnel, tailored to fit any space available in your vessel.
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ANALOG
Sleipner analog signal cables with Plug & Play connectors are color-coded to match the wiring diagrams with high-quality connectors to ensure a correct installation.
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GALVANIC SEPARATION
Immersed parts exposed to seawater are galvanic isolated from the onboard electrical system, eliminating stray currents.
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SEALED DRIVE LUBRICATION
The thruster gearleg is pre-filled for lifetime lubrication and sealed using a long-time mechanical seal with ceramic and carbon surfaces for ultimate security against water intrusion.
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FLEXIBLE COUPLING
Flexible coupling protects the product’s driveline by compensating for minor misalignments between the shafts of the thruster motor and gearleg.
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TWIN COUNTER-ROTATING PROPELLERS
Two counter-rotating propellers offer the most thrust at a good performance ratio in a minimal tunnel diameter. This system is used in our larger thrusters for maximum power. Our twin-counter thruster range is the favorite among leading boatbuilders in high-end yachts.
Item code: SE210/250TC
SE210 is one of Sleipner's most popular models with 210-250 kg thrust. Suitable for boats between 55-78 feet, depending on weight and windage area. Can be mounted in the bow and stern.
The thruster offers great installation flexibility as it can be mounted at any angle on the tunnel. Additionally, the electric motor can be rotated 90 degrees on the motor bracket.
It is galvanically isolated and features Sleipner's patented IPC technology for intelligent power control and safety. See more of the product features below.
Sleipner's tunnel thrusters are the world's top-selling thrusters resulting from over 35 years of development. Over the years, our tunnel thrusters have been installed in over 350,000 boats worldwide.
Bow and stern thruster
They are fitted either in a tunnel through the boat's bow or into a stern tunnel at the boat's stern. Available as standard version (on/off), PRO™ version (variable speed control), and IP PRO™ version (with ignition protection and variable speed control), extending from 20 kg to 300 kg of thrust.
Sleipner's stern tunnels are designed with solid and durable fiberglass to enhance the thruster's performance and are installed effortlessly in the boat's transom. Additional cowls (sold separately) allow installation in boats with shallow drafts or obstructions on the stern.
The electric motors, solenoids, patented IPC control system, and mechanical parts of the propulsion system are all custom designed and built - utilizing the extensive experience gained through years of leadership in the global thruster market.
Docking has never been easier
Our PRO™ thruster models are equipped with speed control, giving you full variable control of the thruster. The speed control is more intuitive for you as a boater and makes for a quieter and more relaxed maneuver. If you install a dual thruster system (bow and stern), you get the revolutionary hold function, pinning the boat to the pier while docking.
Ignition protection
We offer ignition-protected thruster models to provide a reliable and safe installation in locations where the thruster motor may be exposed to water or gasoline fumes.
An additional advantage is that electric parts that could obtain water damage are also covered and protected, making these thrusters the ideal choice for stern thruster installations where ensuring that the thruster will always remain dry is difficult. The IP versions have all the benefits and proven reliability of our standard tunnel thrusters.
Properties
Q-PROP™
The Q-PROP™ has measured noise reductions of up to 75% in controlled environments. The five-bladed skew propeller reduces noise levels while maintaining exceptional efficiency. Some thruster models even see an increase in thrust power.
- The expected noise reduction in average installations: 20-40%
- Upgrade kits are available for most Sleipner thruster models with special adaptors
INTELLIGENT POWER CONTROL
Sleipner's patented intelligent power control provides a minimal delay between drive directions to reduce wear of the mechanical parts while monitoring solenoid functions. In the case of a solenoid lock-in, the thruster will automatically stop without extra user action or controlling the main switch.
OVERHEAT PROTECTION
When high temperatures are detected, On/off thrusters are automatically shut off to prevent overheating. PRO™ thrusters with speed control provide extended run-time by derating power to maintain temperature within safe levels.
FLEXIBLE INSTALLATION
Sleipner offers installation flexibility to work with the space you have. Our thruster models allow installation at any angle on the tunnel, tailored to fit any space available in your vessel.
ANALOG
Sleipner analog signal cables with Plug & Play connectors are color-coded to match the wiring diagrams with high-quality connectors to ensure a correct installation.
GALVANIC SEPARATION
Immersed parts exposed to seawater are galvanic isolated from the onboard electrical system, eliminating stray currents.
SEALED DRIVE LUBRICATION
The thruster gearleg is pre-filled for lifetime lubrication and sealed using a long-time mechanical seal with ceramic and carbon surfaces for ultimate security against water intrusion.
FLEXIBLE COUPLING
Flexible coupling protects the product’s driveline by compensating for minor misalignments between the shafts of the thruster motor and gearleg.
TWIN COUNTER-ROTATING PROPELLERS
Two counter-rotating propellers offer the most thrust at a good performance ratio in a minimal tunnel diameter. This system is used in our larger thrusters for maximum power. Our twin-counter thruster range is the favorite among leading boatbuilders in high-end yachts.
Power | Value |
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Power Source | Electric |
Voltage electric motor | 24V DC |
Power Output | 10kW / 13.15hp |
Thrust at 24V | 250kg / 550lbs |
Thrust at 21V | 210kg / 462lbs |
Current Draw | 500A |
Min. Battery CCA (DIN) | 560 |
Min. Battery CCA (SAE) | 1064 |
Min. Battery CCA (EN) | 940 |
Recommended fuse | ANL 400 |
Operational Intention | Value |
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Bow Capability | Yes |
Stern Capability | Yes |
Retractable Capability | No |
External Mounting Capability | No |
Tunnel Capability | Yes |
Weight | Value |
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Weight | 68kg / 150lbs |
Ideal vessel integration | Value |
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Typical vessel class | Motor boat, Sail boat |
Typical vessel size | 17-24m / 55-78ft |
Measurements | Value |
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(H) Height | 480mm / 18.90in |
(L) Length | 274mm / 10.79in |
(W) Width | 337mm / 13.27in |
(ID) Internal Diameter | 250mm / 9.84in |
(WD) Water Depth | 250mm / 9.84in |
(TL) Recommended Tunnel Length | 323mm / 12.72in |
(TL min.) Minimum Tunnel Length | 273mm / 10.75in |
(T min.) Minimum Tunnel Wall Thickness | 7mm / 0.28in |
(T max.) Maximum Tunnel Wall Thickness | 9mm / 0.35in |
Stern Measurements | Value |
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H | 274mm / 10.8in |
(L) Internal Length | 430mm / 16.9in |
(+L) Tunnel Length | 360mm / 14.2in |
W | 350mm / 13.8in |
(D) Diameter | 254mm / 10in |
(WD) Stern Water Depth | 250mm / 9.8in |
(HT) Maximum Hull Thickness | 50mm / 2in |
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CE Declaration of conformity (Doc) - DC - thrusters
Conformity CertificateEnglishpdf -
Installation Manual, SE (SE210)
Installation ManualEnglishpdf -
DWG.fil SE210-250TC-24V Side-Power tunnel thruster BOW
CAD FileEnglishdwg -
XT.fil SE210-250TC-24V Side-Power BOW tunnel thruster (simple version)
CAD FileEnglishx-t -
STP.fil SE210-250TC-24V BOW tunnel thruster (simple version)
CAD FileEnglishstp -
Product specification sheet_DC_thrusters
Product sheetEnglishpdf -
STP.fil SE210-250 STERN tunnel thruster Side-Power (simple version)
CAD FileEnglishstp -
XT.fil SE210-250 STERN tunnel thruster Side-Power (simple version)
CAD FileEnglishx-t -
DWG.fil SE210-250 STERN Side-Power tunnel thruster STERN
CAD FileEnglishdwg -
User Manual, SE and SE ignition protected (SE, SE-IP)
User ManualEnglishpdf -
User Manual, SE and SE ignition protected (SE, SE-IP) - ITALIAN
User ManualItalianpdf -
User Manual, SE and SE ignition protected (SE, SE-IP) - FRENCH
User ManualFrenchpdf -
User Manual, SE and SE ignition protected (SE, SE-IP) - SPANISH
User ManualSpanishpdf -
User Manual, SE and SE ignition protected (SE, SE-IP) - GERMAN
User ManualGermanpdf -
User Manual, SE and SE ignition protected (SE, SE-IP) - SWEDISH
User ManualSwedishpdf
SE210 tunnel bow/stern thruster 24V
Guide to navigating spare parts
Below you will see the top-level assembly of spare part groupings available to you. If you desire a component within the presented assembly group, click on the name tag below the image to be directed to a detailed spare parts list for that assembly group. If no additional spare parts are available, it means that the current assembly group must be purchased as a whole due to service or installation requirements.
1 Electric motor SP200/SE210 24V
Electric motor
Bolt
Lock washer
Cable lug
Brushes for motor (kit)
Brushes spring for motor (kit)
Temp switch
2 Gearleg SE170/210
3 Motor bracket SE210
DIN 912 - M10 x 30
Bushing Ø10,5
Bracket
Bushing Ø45
4 Flexible coupling Ø28xØ20
ISO 4762 - M8 x 25
Flens boss N2, Ø20 L=36
5 Solenoid SE150/170/210/250/300
DIN 913 - M5 x 16
Solenoid 24V
6 Controller SE100-130 12V + SE150-250 24V
7 Solenoid cover kit SE150/170/210/250/300
Solenoid cover
8 Gearleg SE170/210 w/out propeller
Shaft seal
Bolt
Lock washer
Washer
Drive pin
Washer for propeller
Nut for propeller
9 Solenoid bracket kit
DIN7985 M5x8 + DIN6797 M5
DIN 933 - M6 x 12
DIN 6798 - A 6,4
Bracket for solenoid
Relay Clip
DIN 7337 - A3,2 x 8
10 Anode kit, aluminium aloy (Al-Zn-In)
Alu anode
Bolt
Disclaimer
Sleipner warranties the original spare parts supplied only. The installer alone has responsibility for the installation of the spare parts. Do not attempt to fit replacement parts unless you are competent. If the spare part is fitted incorrectly, Sleipner Group will not be liable for any damage resulting.
The information given in the document was correct at the time it was published. However, Sleipner Group cannot accept liability for any inaccuracies or omissions it may contain. Continuous product improvement may change the product specifications without notice. Consequently, Sleipner Group cannot accept liability for any possible differences between product and document.
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Not necessarily. These systems typically come with a Battery Management System (BMS) that will disconnect the thruster in case of any issue with the battery (for instance, if the thruster draws more current than the BMS allows). Just imagine a sudden cut-out in the middle of a maneuver without any pre-warning.
At Sleipner, we recommend a solution with a simple, separate battery and without a disconnect BMS system (such as the lead acid bank frequently used for starting or similar). The helmsman will then be warned when the battery is getting low and feel that the thrusters are gradually losing power, which is significantly better than losing your thrusters without any pre-warning.
Disclaimer: Ensure battery/energy source is installed according to CE/ISO current rules and regulations and by licensed electricians.
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We always recommend that both bow and stern thrusters are mounted in a dry and well-ventilated compartment. Sleipner's thruster motors, electronic components, and wiring harnesses do not perform well when wet or corroded. They are neither water nor corrosion-proof and therefore need to be kept as dry as possible.
We supply ignition proof (IP) thrusters (spark-free) designed for petrol-driven yachts where ignition of petrol fumes is an issue. The IP thrusters can be appropriate for yachts where it is challenging to keep thruster compartments 100% dry. The IP thrusters are tested underwater to handle moisture and a little water shower now and again, but not completely immersed.
(Addition Feb 2023:) The new E-serie thrusters launched in 2022 also features the same characteristisc as IP thrusters, but in a more compact format and might allow installations in small areas where IP models have not previously fit. -
Yes – but it needs to be Ignition Protected to avoid risks related to potential gasoline fumes in the engine room.
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Yes. Most engineers would tell you that it is not ideal for connecting the bow thrusters to a service bank protected by a Battery Management System. Thrusters are heavy consumers, and they may create sudden peaks in current draw, which again may cause the BMS to disconnect the batteries if the thruster draws more current than allowed. If this happens in the middle of a maneuver, you would be left without thrusters and may lose control of the boat.
Hence, Sleipner recommends that the thrusters be connected to a separate battery bank (that is not lithium) without a Battery Management System that can disconnect the batteries (and consequently the thrusters).
Disclaimer: Ensure battery/energy source is installed according to CE/ISO current rules and regulations and by licensed electricians.
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We recommend installing the thruster as deep as possible and at least 3/4x the tunnel diameter below the waterline (eg 300mm x 0,75 = 225mm minimum).
On some boats this might be impossible due to the positioning of other equipment onboard and for the lack of better options, it might only be possible to get the top of the tunnel ½ x the tunnel diameter below the waterline. Notice though that this increase the risk of cavitation.
For some boat types, external or retractable thruster models might be a better solution if it is difficult to place the tunnel deep enough.
We always recommend to seek the advise of experienced installers for optimal results. -
How much thrust your boat needs generally depends on its size, the thruster's installation point, the surface affected by the wind – and your expectations as to how fast you want the boat to react.
Sleipner has the world's largest database on expected thruster performance on different boats and has developed proprietary software that can run simulations. Based on this we are giving some general recommendations on our website. You can read more about thruster sizing here.
For help to right-size a thruster to your boat, we recommend contacting your local Sleipner dealer.
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We recommend to replace the anode before every season, or when half the anode has eroded. Always use a sealant or thread glue on the holding screw to ensure that it does not fall off.
If you want to read more about corrosion in general, please see our "Boaters guide to corrosion"
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A Lithium or Li-ion battery may maintain a significantly higher voltage and higher current under load than a lead-acid, gel or AGM battery. This will provide significantly more power to the thruster motor and give some undesired side effects:
- The propeller will rotate significantly faster and with higher power than what they are designed for, increasing the risk of cavitation and following damages in the tunnel and at the thruster.
- The thruster risks overheating and will have shorter run times. This can cause the thruster to stop in the middle of a maneuver.
- Over time, the thruster may be damaged and you may have a reduced life expectancy.
Sleipners speed controlled thrusters will not be impacted by Lithium, Li-ion or similar battery times providing a steady high voltage.
Disclaimer: Ensure battery/energy source is installed according to CE/ISO current rules and regulations and by licensed electricians.
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This is a unique patented Sleipner safety feature supplied with all standard (on/off) DC electric Sleipner thrusters. The IPC functionality provides two unique features:
1) It will detect "flapping" of the solenoid (typically caused by badly charged batteries that are subject to a huge current draw and voltage drop when the thruster motor is engaged), and will stop trying to run the thruster, preventing excess solenoid contact tip wear and dramatically reducing the risk for a weld-in situation of the solenoid. A 'weld in' (run away) situation is when a thruster continues operating without a signal from the operator at the control panel.
2) Even if the solenoid has a weld-in situation, which even with the IPC prevention actions is still possible, as all mechanical switches can weld-in at a point, the unique IPC function will STOP THE THRUSTER, without active action by the operator. This will give the operator time to locate and Select OFF on the thruster system Isolation/Main Switch.
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If the tunnel is too short, water will circulate from one side of the tunnel to the other and reduce thrust. The gearleg might also be at risk from water passing through the tunnel at high speeds during driving, turning the propeller(s) at very high speeds. Note that tunnel openings must be rounded and with a deflector to direct water out from the tunnels back wall. Please see installation manuals for proper tunnel installation.
If the tunnel is too long, it creates too much friction and reduce thrust and you might want to increase the thruster size to compensate.
Maximum and minimum tunnel lengths for each thruster can be found in their manuals, which can be downloaded from this website.
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Sleipner recommends that the thrusters are connected to a battery bank that is not protected by a Battery Management System (BMS). Typically this means lead-acid, AGM, gel, or similar kinds of batteries. This is important because thrusters draw a lot of currents quickly, and the high amp draw may lead the BMS system to think that there is an issue with the system and consequently disconnect the batteries from the circuit, in which case you would lose maneuverability.
If you have Lithium batteries powering your thrusters, the best advice we can give you is to check the actual voltage measured on the thrusters during operation. Sleipner thrusters are designed to operate within a specific voltage range, and as long as you are within these boundaries, it doesn’t matter for the thruster if the current is delivered by this or that battery pack.
It may also be a very good idea to check the actual current drawn from the battery during full power at the thruster to see that you are not at the limit for the BMS to avoid sudden loss of maneuverability if the BMS disconnects the battery.
With installations where the battery pack is far from the thruster, the higher voltage delivered by LiFePO4 or similar batteries might not be a problem as you will experience a voltage drop through the long cables.
Always make sure you measure your voltage on the thruster to avoid the risk of early thruster wear.
As battery tehcnology is changing rapidly, we always recommend consulting a professional battery supplier.
Disclaimer: Ensure battery/energy source is installed according to CE/ISO current rules and regulations and by licensed electricians.
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For our standard Sleipner DC powered thrusters, the model number can be found on the front cover and the serial number on the badge on the electric motor.
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The thruster should be positioned as far forward as possible. This is important as the relative distance from the boats pivot point to the thruster installation point will change the actual thrust of the boat. The further away from the pivot point of the boat – the larger the thrust.
The thruster shall be positioned as deep as possible for two reasons;
- So that it does not suck air from the surface, causing cavitation which will significantly reduce thrust and create noise
- To increase the water pressure so that the propeller has a firm substance to work with for maximum performance. We recommend at least ¾ x the tunnel diameter below the surface and more is better. It is never recommended to go less than ½ x the tunnel diameter below the water surface.
In reality it is often a compromise between how far forward you want the thruster to maximise the force arm from the pivot point of the boat – and how deep you can position the thruster.
It is also a good advice on high speed boats to consider that the tunnels can come out of the water at high speed, but as slamming loads can be overcome by working with the tunnel installation to deflect the water.
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A legacy that commits
We’ve lived and worked with the unruly sea for a hundred years. That’s why we develop important features that enables a boat to handle the sea better – that enable you to enjoy your boat, at anchor and at full speed. That is why you wanted a boat, isn’t it?
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Beautiful engineering
The technology in our solutions is world-class. We know, because we’ve developed it ourselves, just as we manufacture every solution, and follow them until their fixed to a hull, ourselves. This meticulous attention to detail is why your day out always will be better with a Sleipner aboard.
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Worldwide service
We take pride in our solutions’ function throughout their lifespan. So, we never really let them out of sight, even when they’ve left for distant shores. Our global network is there to ensure continuous optimal function. You know what you get with a Sleipner, today and tomorrow.