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Lewmar · retractable thruster · bow
Lewmar RT185 MX Gen 2: specs, price and the boats it fits
It gives 214 lb (97 kgf) of push. Lewmar's own chart puts it on boats of 51 to 60 ft. It runs on 12 V or 24 V.
- Haul-out to install
- DIY 2 of 5: wiring prep only
- 3-year warranty
Quick stats
- Thrust 214 lb 97 kgf, Lewmar's rating
- Boat length 51 to 60 ft Lewmar's chart, by windage. See below
- Price per lb of thrust $40.59 Unit only. $81 to $138 installed
- Voltage 12 V or 24 V As sold
- Battery at 12 V 700 CCA One battery, near the thruster
- Run limit 3 min In one direction, then fault mode
- To install it Haul-out The boat comes out of the water
- Anodes No US price The parts list names them
About the Lewmar RT185 MX Gen 2
The RT185 MX Gen 2 is Lewmar’s retractable bow thruster: it lowers out of a housing in the hull when you switch the panel on and tucks away when you switch it off. The piece cut out of the hull usually becomes its closing door, so the bottom stays smooth under way. It gives 214 lb of push at 12 or 24 V, for boats of about 51 to 60 ft on Lewmar’s chart.
Defender prices the 12 V unit at $8,687 and the 24 V one at $9,034, against $3,427 for a 185TT tunnel unit of the same push. The housing and the lowering gear come with it. The 24 V version draws about half the current, which eases the cable; batteries, cable and charging run $866 to $1,135. See every part.
Read more
Installing it means building a watertight compartment and bonding a flange into the hull, a yard job. Never run it out of the water: the manual warns the motor will overspeed. The panel powers it down after five minutes idle. Warranty: three years, with one on the motor and controls.
Installers will find the wiring figures and dimensions further down. For the rest of Lewmar’s line, read the Lewmar thruster review.
Where this summary comes from (6 sources, read 13 October 2026)
- Defender listing (the database’s price)
- Lewmar retractable thruster manual 55110070 iss.4 (housing, closing door, five-minute power-down)
- Lewmar Thruster Selection Guide (boat length by windage)
- Lewmar Gen 2 TT installation manual 559231 Iss.3 (three minutes one way, then fault mode; warranty one year on motors and controls)
- Lewmar, About (making boat hardware in Havant, England, since 1946)
- Lippert Components acquires Lewmar Marine Limited, 1 August 2019
Will the Lewmar RT185 MX Gen 2 steer your boat?
58 FT TRAWLER · BOW · 15 KT WIND
Every knot figure here is wind speed, not boat speed or current.
On a 58 ft trawler the Lewmar RT185 MX Gen 2 (214 lb) steers her in a 15 knot breeze. Her bow needs about 225 lb from a retractable to steer her in a 15 knot breeze. Its 214 lb lands within 15 percent of that figure, which this site counts as enough.
The finder lists it for her.
The Lewmar RT185 MX Gen 2 on a trawler, by length
- 25 ft34 kt
- 30 ft28 kt
- 35 ft24 kt
- 40 ft21 kt
- 45 ft19 kt
- 50 ft17 kt
- 55 ft15 kt
- 60 ft14 kt
- 65 ft13 kt
- 70 ft12 kt
- 75 ft11 kt
- 80 ft11 kt
Outlined: the finder does not list it at that length (under 13 kt, far more than she needs, or outside Lewmar’s own length range).
- Under 10 kt
- 10 to 15 kt
- 15 to 20 kt: the sweet spot
- Over 20 kt: more than she needs
Prices are the low end of the installed total, from our estimate. For your own boat, drive and installer, the finder prices each unit.
Is it right for your boat?
Every kind of boat it fits, by length
| Boat | Full thrust at 15 knots | Still a fit, in lighter wind | Lewmar’s chart |
|---|---|---|---|
| Pontoon & tritoon | Not listed. A retractable drops down inside the hull, and a pontoon has no hull depth to drop into. | ||
| Sailboat | 41 to 59 ft | 60 to 67 ftfull thrust to about 13 knots at 67 ft | 56 to 60 ftas the 185TT 6.0, class B |
| Houseboat | 31 to 43 ft | 44 to 50 ftfull thrust to about 13 knots at 50 ft | 51 to 55 ftas the 185TT 6.0, class C |
| Catamaran | 46 to 67 ft | 68 to 76 ftfull thrust to about 13 knots at 76 ft | 51 to 55 ftas the 185TT 6.0, class C |
| Trawler | 41 to 58 ft | 59 to 66 ftfull thrust to about 13 knots at 66 ft | 51 to 55 ftas the 185TT 6.0, class C |
| Motor yacht | 41 to 58 ft | 59 to 66 ftfull thrust to about 13 knots at 66 ft | 51 to 55 ftas the 185TT 6.0, class C |
| Bass & flats | Not listed. A retractable needs hull depth to drop into, and these planing hulls have almost none forward. | ||
| Wake & ski boats | Not listed. A retractable needs hull depth to drop into, and these planing hulls have almost none forward. | ||
| Express cruiser | 52 to 65 ft | None | 56 to 60 ftas the 185TT 6.0, class B |
| Center console | No length. More thrust than the boat needs. | ||
The Lewmar RT185 MX Gen 2 against each kind of boat, in a 15 knot wind. Our sizing, from the finder’s own rules, beside Lewmar's chart.
The first column is where one unit gives all the thrust the boat needs in 15 knots. The second is where the finder still lists it: the unit steers her in a 13 or 14 knot wind, within 15 percent of the 15 knot breeze this site sizes for. On a boat shorter than the first column’s shortest length, the unit is more than the boat needs.
How we size it
Our figure is the longest boat one unit can steer in a 15 knot wind. It is a range because each kind of boat catches the wind differently. Here a houseboat gets full thrust to 43 ft, and a catamaran to 67 ft.
The table tries the Lewmar RT185 MX Gen 2 on each kind of boat, at every length that kind of boat is built in. The wind is 15 knots and the rules are the finder’s own. A length counts as a fit when the unit gives the thrust that boat needs at the bow. The listing prints no boat length, so thrust alone decides. Lewmar's own figures are in the opening lines.
Reading Lewmar’s chart. Lewmar publishes a selection guide, checked 15 September 2026, on a dealer’s copy. It names a model by boat length, from 30 to 90 ft, for a The area of the boat the wind can push on: the hull sides, the cabin, the mast and rigging, or the canopy. A tall, boxy boat has a lot of it, and wind force does not care how slowly you are moving. class and a wind band. Our 15 knots falls in its lightest band, 11 to 16 knots.
The Lewmar RT185 MX Gen 2 is not on the chart by name. Lewmar rates it at the same 214 lb (97 kgf) as the 185TT 6.0. That tunnel unit is on the chart, so the column shows what the chart says for it. Which class a kind of boat falls in is our reading of its windage. The chart starts at 30 ft.
It is sized for six kinds of boat here. For your own boat, the finder gives an answer that also counts your drive and who does the installing. The compare page sets this unit beside others.
What it costs installed
A yard job, everything in. Our estimate.
| Boat | Total installed |
|---|---|
| 31 ft | $16,831 to $19,672$79 to $92 a lb of thrust |
| 55 ft | $17,361 to $29,462$81 to $138 a lb of thrust |
| 76 ft | $17,711 to $30,482$83 to $142 a lb of thrust |
From the shortest to the longest boat it is sized for.
What is in each total
These totals are our estimate of a yard job: the unit’s price, plus a yard’s hours at $160 to $180 an hour, plus the batteries, cable and charger, plus the other parts the box does not hold. A Lifting the boat out of the water on a travel lift or a trailer so work can be done below the waterline. It is billed separately from the job itself. adds $550 to $3,670 at these lengths, with 5 to 7 days out of the water, worked from eight yards’ own rate cards. The hours are our own estimate. The cost page builds the same figures line by line.
| Boat length | The unit | Yard labor | Haul-out | Batteries, cable, charger | Other parts |
|---|---|---|---|---|---|
| 31 ft | $8,687 to $9,034 | $6,400 to $7,200about 40 hours | $550 to $1,500 | $866 to $1,135 | $328 to $803 |
| 55 ft | $8,687 to $9,034 | $6,400 to $15,84040 to 88 hours | $1,080 to $2,650 | $866 to $1,135 | $328 to $803 |
| 76 ft | $8,687 to $9,034 | $6,400 to $15,84040 to 88 hours | $1,430 to $3,670 | $866 to $1,135 | $328 to $803 |
For every length in the table above.
How the batteries, cable and charger add up. We price a battery bank close to the thruster, as the makers recommend, with 10 to 20 ft of cable out and back: red for the positive, black for the negative, cut to length. The low end is the cheapest battery that meets the figure and the shorter run; the high end is a sealed (AGM) battery and the longer run. The charger is a NOCO GEN5X2 two-bank shore charger.
Batteries and lugs are priced at Fisheries Supply and the cable and charger at Defender, read 26 October 2026.
- At 12 V: one 12 V battery, at least 700 CCA (Lewmar’s minimum), $360 for the battery; Lewmar’s cable table gives 2 x 3/0 AWG, priced on 2 x 4/0 AWG, the nearest size cut to length: $360 to $629 for the red and black cable and the lugs; a GEN5X2 charger, $146.
- At 24 V: two 12 V batteries in series, at least 370 CCA each (Lewmar’s minimum), $513 for both; Lewmar’s cable table gives 2 x 2/0 AWG: $228 to $403 for the red and black cable and the lugs; a GEN5X2 charger, $146.
The sizing and the costs on this page are estimates, for guidance only and without warranty. They are no quote, and nobody has inspected your boat. Check them against the maker’s manual and your yard before you rely on them. Terms of use.
DIY breakdown
DIY levels
- Level 5: Owner install. No yard, no electrician.
- Level 4: You install it, electrician connects. You mount and wire it; a marine electrician makes the final connections.
- Level 3: Split with the yard. The yard does the below-waterline part; you do the wiring.
- Level 2: Wiring prep only. The yard installs the unit and does the hull work; you do the wiring prep.
- Level 1: Yard job. A qualified professional does all of it.
You Yard Electrician. The bar is labor hours; a haul-out is a note.
How we rate DIYYou: 4 to 16 hours Yard: 40 to 88 hours Electrician: 2 to 4 hours Plus a haul-out.
Your part needs:Heavy battery cableCrimping big lugs
Every step, and who does it
- Cut the hull and fit the housing and mechanism Yard 40 to 88 hours Nobody publishes an hours figure. Fisheries Supply says installation is significantly more expensive than a tunnel, and that is too loose to turn into a number. So this is the tunnel’s own banded figure plus a quarter, which keeps it above a tunnel as the distributors describe it.
- Mount the battery box, switch and fuse holder; run and secure the cables You 4 to 16 hours Our estimate. No maker times this step, and a first-time owner is slower than a yard, so the range is wide.
- Final connections at the battery and the motor, load test Electrician 2 to 4 hours Our estimate. Nobody publishes a time for the final connections and test on their own.
A qualified marine electrician should make the final connections and test them before first use. Hours are labor only.
Related videos
One of Lewmar’s own videos, from its YouTube channel. They play only when you tap. A maker’s video is its pitch, so take any claim back to the figures on this page.
Know before you buy
What sets this model apart, what it costs to keep, and what to weigh.
Price per pound of thrust
$40.59 a lb The unit’s price over its published thrust. The bars are Lewmar’s next sizes and the nearest other makers.Controls
The solenoid, the ICU control box and a 2 m motor loom are in the box. The panel, its loom, the fuse and holder are bought.
- Lewmar Gen 2 single pad control (589223), $313.07 at Fisheries Supply.
- Lewmar Gen 2 AUX control loom, 7 m (589802), $69.10 at Fisheries Supply.
Anodes
We found its anode in Lewmar’s parts list, with no US price. The parts below name it.
They sit below the waterline, so a change means a haul-out or a diver.
Service and warranty
Lewmar gives 3 years, but 1 on electric motors and their electrical equipment and on electronic controls. Service by anyone but an authorized Lewmar representative can void it. Removal, transport and installation costs are not covered.
See Lewmar’s warranty Lewmar's Gen 2 installation manual.Special mentions
Battery: at 12 V it wants one battery of 700 CCA or more, Lewmar's figure. The cheapest that meets it is the Optima BlueTop SC27DM Group 27 AGM, $359.99. Check your own bank.
Charger: a NOCO GEN5X2 two-bank shore charger, $146.41. It is the one our estimate prices.
Dealer prices at Fisheries Supply, read 26 October 2026.What to weigh
The boat comes out of the water to install it: it needs a large hull opening below the waterline.
Lewmar prints no single length band for it. Its selection chart gives one by windage: 51 to 60 ft at 15 knots, across the kinds of boat in the table. The boat table is our sizing alone.
Short pushes only: Lewmar rates the motor for 3 min at a stretch.
At 12 V it draws 700 A, so the battery cable is heavy and the battery sits close to it.
Parts for the Lewmar RT185 MX Gen 2
See the Lewmar RT185 MX Gen 2 manualSearch for the number as printed here, with no spaces. Prices are each dealer’s on the day shown, before shipping and tax. Check the plate on your motor before you order: some parts change with the tunnel size, the voltage or the year.
For the install what the box leaves you to buy
The manual button above opens it a dealer's copy (the maker publishes none we could find). It has the hull, wiring and fuse figures for this model.
From Lewmar’s RT retractable manual 55110070, Iss.4, read 16 October 2026.
- In the box
- The manual prints no box list. It mentions the M10 bolts and screws, the cable boots and a split pin as supplied.
- Bought separately
- The wire kit from the motor to the control unit (the manual says it is not included), M10 nyloc nuts for the door, the main fuse and holder, the battery switch and breaker, a power cable for the control unit, and the control panel with its leads.
- Charging
- The manual sizes the battery by cranking amps and says to "ensure batteries are fully charged before switching on the main power". It gives no rule on a charger, a feed or a bank of its own.
In Lewmar’s words, from its Gen 2 TT installation manual 559231 and the RT manual 55110070, page 12: “Battery crank capacity should be at least equal to the thruster current.”
The “other parts” line in the estimate above covers these parts as a range, $328 to $803 at Fisheries Supply’s prices on 30 September 2026 and 26 October 2026, because the exact items depend on your boat. The batteries, cable and charger have a line of their own. The cost page has what every maker says about each part.
Control panel
Fisheries Supply lists it as “Lewmar Gen 2 single pad control”.
Check the listing or the box before you buy: the maker does not say whether one is included.
Control cable, panel to thruster
Fisheries Supply lists it as “Lewmar Gen 2 AUX control loom, 7 m”.
Sold in lengths from 7 to 18 m. This is the shortest: measure the run from the helm to the thruster and buy the length that reaches.
Main fuse
Ask for 500 A. This one is for the 12 V version.
The manual calls it a circuit breaker in its wiring table and a fuse of the same rating in its parts list. Its parts list names the fuse as Lewmar 589011, in holder 589013. Buy the type the manual names.
Main fuse
Ask for 325 A. This one is for the 24 V version.
The manual calls it a circuit breaker in its wiring table and a fuse of the same rating in its parts list. Buy the type the manual names.
Fuse holder
Ask for Lewmar fuse holder 589013. This one is for the 12 V version.
Ask a Lewmar dealer.
Fuse holder
Ask for The holder for the fuse type your manual names. This one is for the 24 V version.
Match it to the fuse.
Motor wire kit, motor to control unit
Ask for Lewmar 589808 (2 m) or 589809 (5 m).
Not included with the RT185. Not listed at Fisheries Supply; ask a Lewmar dealer.
Battery switch
Fisheries Supply lists it as “HD-Series 600 A battery switch, on/off”. This one is for the 12 V version.
Rated at or above the 500 A main fuse. If your manual names its own switch, use that one.
Battery switch
Fisheries Supply lists it as “e-Series 350 A battery switch, on/off”. This one is for the 24 V version.
Rated at or above the 325 A main fuse. If your manual names its own switch, use that one.
Control-circuit fuse holder
Fisheries Supply lists it as “Waterproof in-line ATO/ATC fuse holder”.
Lewmar's control unit (ICU) draws 8 A and has a slow-blow fuse inside; fuse its own supply to suit the wire, and use cable rated for 8 A.
Batteries
Fisheries Supply lists it as “Optima BlueTop SC27DM Group 27 AGM”. This one is for the 12 V version.
One at 700 CCA or more. The cheapest listing that meets it.
Batteries
Fisheries Supply lists it as “Lifeline GPL-1400T AGM starting”. This one is for the 24 V version.
You need 2, each at 370 CCA or more, in series for 24 V. The cheapest listing that meets it.
Battery cable, red and black
Defender lists it as “Ancor tinned battery cable 4/0 AWG, cut to length, red or black”. This one is for the 12 V version.
You need 10 ft of each color, twice over (20 ft of each). For about 20 ft of cable in all, out and back. Measure your run and check it against the cable table in the manual: never go smaller than it asks for.
Battery cable, red and black
Defender lists it as “Ancor tinned battery cable 2/0 AWG, cut to length, red or black”. This one is for the 24 V version.
You need 10 ft of each color, twice over (20 ft of each). For about 20 ft of cable in all, out and back. Measure your run and check it against the cable table in the manual: never go smaller than it asks for.
Cable lugs
Fisheries Supply lists it as “Tin-plated starter lugs, 4/0 AWG, bag of 10”. This one is for the 12 V version.
You need 2 bags. The listing runs $47.52 to $49.44 by stud size. Eight ends on one run, with two spare.
Cable lugs
Fisheries Supply lists it as “Tin-plated starter lugs, 2/0 AWG, bag of 10”. This one is for the 24 V version.
You need 2 bags. The listing runs $27.96 to $29.36 by stud size. Eight ends on one run, with two spare.
Charger
Fisheries Supply lists it as “GEN5X2 on-board charger, 10 A, 2 banks”.
Or a DC-to-DC charger from the house system: ask the electrician.
Control unit
Ask for Lewmar RT Gen 2 ICU (blue box) 589296.
Runs the thruster and powers the panel, on its own battery supply, within 5 m of the motor. The manual does not say whether it comes in the box: check before you buy.
Outside the hull replacement parts in the water
Anode kit
The metal that wears away in the water so the drive does not. Lewmar calls it “RT 185 ANODE KIT”.
Propeller
The propeller on the drive. Lewmar calls it “185 PROPELLOR”.
The RT185 runs two of these, one each end of the gear leg.
Shear pin kit (breaks to protect the drive)
A pin made to break if the propeller hits something, so the drive does not. Lewmar calls it “RT 185 SHEAR PIN KIT”.
The same manual also prints 56110029 against the RT140 lower flange. Quote RT185 shear pin kit when ordering.
Lower flange
Lewmar calls it “RT 185 LOWER FLANGE”.
Inside the boat replacement parts on board
Actuator shear pin kit (protects the lift actuator)
A pin made to break if the propeller hits something, so the drive does not. Lewmar calls it “RT ACTUATOR SHEAR PIN KIT”.
Lift actuator kit, 12 V
Lewmar calls it “RT ACTUATOR 12V KIT”. This one is for the 12 V version. It fits the 12V size on this page.
Lewmar sells 12 V and 24 V actuator kits. Match the voltage on your actuator.
Lift actuator kit, 24 V
Lewmar calls it “RT ACTUATOR 24V KIT”. This one is for the 24 V version. It fits the 24V size on this page.
Lewmar sells 12 V and 24 V actuator kits. Match the voltage on your actuator.
Controller box (the ICU)
The electronics that run the motor when you press the panel. Lewmar calls it “RT GEN2 I.C.U. ASSY”.
The retractable ICU is not the same part as the tunnel thruster ICU 589274.
Main fuse, 325 A
The main fuse at the battery, in the rating the maker gives. Lewmar calls it “325 A ANL TYPE FUSE”. This one is for the 24 V version. It fits the 24V size on this page.
The rating the manual gives for the RT185 6.0 kW 24 V. The 12 V takes 500 A.
Main fuse, 500 A
The main fuse at the battery, in the rating the maker gives. Lewmar calls it “500 A ANL TYPE FUSE”. This one is for the 12 V version. It fits the 12V size on this page.
The rating the manual gives for the RT185 6.0 kW 12 V. The 24 V takes 325 A.
Control panel, dual joystick (bow and stern)
The control at the helm. Lewmar calls it “Controller, Dual Joystick”.
Control panel, dual pad (bow and stern)
The control at the helm. Lewmar calls it “Controller, Dual Pad”.
Control panel, single joystick
The control at the helm. Lewmar calls it “Controller, Single Joystick”.
Control panel, single pad
The control at the helm. Lewmar calls it “Controller, Single Pad”.
Replacement motor
The electric motor that turns the propeller. Lewmar calls it “185 6.0KW 12V MX”. This one is for the 12 V version. It fits the 12V size on this page.
Replacement motor
The electric motor that turns the propeller. Lewmar calls it “185 6.0KW 24V MX”. This one is for the 24 V version. It fits the 24V size on this page.
No part matches. Try the number without spaces, or the part’s name.
The install parts are matched to Lewmar’s own figures and priced at Fisheries Supply, with the battery cable at Defender, cut to length.
Spare part numbers come from Lewmar’s parts pages and manuals. A dealer may sell a part we have not priced. Search for the number.
Other sizes and close alternatives
- Size up Lewmar 250VRTT Vertical Retractable 353 lb · $29,417
- Other maker Sleipner SRVP80 PRO 212 lb · $10,510
- Other maker Max Power Compact Retract three sizes, 154 to 220 lb · $7,370
- Other maker Quick BTR 185 six sizes, 143 to 231 lb · $12,436 to $17,991
The other makers listed are the nearest match each makes, of the same style and for the same end, within a quarter of its thrust. The compare page lists every model, and the thruster index lists every model with a page here.
For the yard and the installer
Every published figure, with its source.
Full spec sheet
| Thrust and motor | |
|---|---|
| Thrust | 214 lb (97 kgf) As printed: 214 lbs (97 kgf) |
| Motor | 6 kW |
| Voltage | 12 V or 24 V |
| Run limit | 3 min in one direction, then fault mode |
| Installation | |
| Type | Retractable, drops down |
| End of the boat | Bow |
| Tunnel diameter | 185 mm |
| What it does to the hull | Large hull opening below the waterline |
| Haul-out to install it | Yes |
| Maker’s boat length | 51 to 60 ftLewmar's selection chart, by windage; the listing prints none |
| Price and ordering | |
| Price | $8,687 to $9,034 equipment only, a dealer's price, defender.com, 26 October 2026 |
| Part number | Not held for this listing |
| Documents | |
| Manual | Installation manual (PDF)a dealer's copy (the maker publishes none we could find) |
| The site’s review | Lewmar thruster review |
Every published figure the site holds for the Lewmar RT185 MX Gen 2, with where each came from.
Draw, cable, fuse and battery at each voltage
These are the maker’s own figures, at each voltage it is sold at. The cable is the size for the shortest run in the maker’s table. A longer run may need heavier cable, and the wiring calculator works that out for your own boat.
| Voltage | Draw | Maker’s cable | Fuse | Battery | Run limit |
|---|---|---|---|---|---|
| 12 V | 700 Anominal draw | 2 x 3/0 AWG per leg, the one size Lewmar gives for this model, for any run up to 36 ft of cable counted out and backretractable thruster manual, iss.4 | 500 Aretractable thruster manual, iss.4 | Crank capacity at least the 700 A draw, Lewmar's ruleLewmar retractable thruster manual | 3 min in one direction, then fault moderetractable thruster manual |
| 24 V | 370 Anominal draw | 2 x 2/0 AWG per leg, the one size Lewmar gives for this model, for any run up to 118 ft of cable counted out and backretractable thruster manual, iss.4 | 325 Aretractable thruster manual, iss.4 | Crank capacity at least the 370 A draw, Lewmar's ruleLewmar retractable thruster manual | 3 min in one direction, then fault moderetractable thruster manual |
The Lewmar RT185 MX Gen 2’s draw, cable, fuse, battery and run limit, as the maker publishes them.
- At 12 V: size the cable for your run, or check the battery you have.
- At 24 V: size the cable for your run, or check the battery you have.
Our notes from the manual and listings
In the box: The solenoid, the ICU control box and a 2 m motor loom are in the box. The panel, its loom, the fuse and holder are bought.
12 V
A retractable: the unit lives in a housing let into the hull and drops when used. It is a bigger yard job than a tunnel and a mechanism to keep working. Every Lewmar goes on with the boat out of the water. Defender rates the RT185 MX Gen 2 at the same 214 lb (97 kgf) as the biggest 185TT, at 12 or 24 V.
The 24 V unit is about four percent dearer. The Gen 2 tunnel manual does not cover this unit, but its control rules name one: a retractable powers down after five minutes idle, a tunnel unit after 15. Three years' warranty on paper, but one year on electric motors, associated electrical equipment and electronic controls.
Service by anyone but an authorized Lewmar representative voids the warranty, and removal and reinstalling are not covered. Lewmar publishes no boat length for any unit. This row is the 12 V version; Defender prices it separately, read 12 October.
24 V
This row is the 24 V version; Defender prices it separately, read 12 October.
Where each point above comes from
- It is sold at 12 V and at 24 V.The maker's and dealers' listings
- The boat comes out of the water to install it: it needs a large hull opening below the waterline.The mounting: a bore through the hull, or a housing recessed into it
- Lewmar prints no single length band for it. Its selection chart gives one by windage: 51 to 60 ft at 15 knots, across the kinds of boat in the table. The boat table is our sizing alone.Lewmar's Thruster Selection Guide, checked 15 September 2026
Not sure this is the one? The thruster finder asks about your boat and prices every unit that fits.