Set Sail with Technic!
Build a Floating Catamaran

Experience the thrill of sailing with this realistic 405-piece LEGO Technic set that really floats! Perfect for aspiring engineers and boat enthusiasts.

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🏛 Technic
Set #42105

Catamaran

The LEGO Technic Catamaran is a surprisingly fun and functional model.

🏆 Best For: Perfect for older kids and adults interested in Technic builds and nautical themes. ⏱ 3 hr build 🧩 405 pcs 🎂 Ages 8+
★★★☆☆ 3.8 from 3 reviews

Fans appreciate the Catamaran's unique floating ability and engaging build process for its size. Some reviewers note that the model may feel somewhat basic for experienced Technic builders and that the sails are simple.

📝 Our Take

The LEGO Technic Catamaran is a surprisingly fun and functional model. This set brings the thrill of sailing to the LEGO world, offering a unique building experience and the novelty of a floating Technic creation.

This set is perfect for LEGO enthusiasts of all ages, especially those interested in Technic and nautical themes. With a manageable piece count and engaging building process, it's a great introduction to Technic concepts and offers a satisfying display model.

Skip this if you are looking for complex building techniques or high display value. While fun, it's a relatively simple build, and might not satisfy expert builders; consider the Ocean Explorer (42064) for a more challenging nautical build.

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How does the Catamaran's design ensure it floats and remains stable in water? What are the key differences between building a Technic set versus a standard LEGO set? How does the value of the Catamaran compare to other retired Technic sets with similar piece counts? What's the best way to display the Catamaran to showcase its design and functionality?

🧱 Building Experience

🧩
405
Pieces
3h
Build Time
📊
Intermediate
Difficulty
📏
32cm × 22cm × 44cm
Dimensions
Build Highlights:
  • Experience building a functional catamaran with working sails and rudder.
  • Learn about dagger board mechanics and their role in boat stability.
  • Enjoy the unique feature of a LEGO Technic model that actually floats on water.
  • Discover the classic twin-hull catamaran design recreated in LEGO form.

📈 Investment Analysis

→ Price stable
B
Investment Grade
⏳ Active
The LEGO Technic Catamaran (42105) presents a moderate investment opportunity. As a retired set, its value will likely appreciate over time, especially given the Technic theme's popularity and the unique floating feature. However, the relatively low piece count and original MSRP may limit significant price surges. Monitor market trends and consider holding for long-term gains. The theme is popular, but the set itself isn't particularly rare or sought after, so expect steady but not explosive growth.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

📖 About This Set

Kids can recreate the thrill of boat racing with this super-cool LEGO® Technic™ (42105) Catamaran toy. For the first time ever, this LEGO Technic model toy floats on water! So, sailing enthusiasts can learn while they play. See how the sails work. Or how the dagger boards maximise stability and how the rudder steers. With the classic 2-hull catamaran design, this model boat is a fantastic recreation of the real thing.Learn how to build and sail an awesome toy boatBuild… rebuild… play… display... There’s so much for kids to discover with this LEGO engineering toy. Have fun building the Catamaran – inspired by real race boats. Then set it in the bathtub to recreate speed sailing adventures before rebuilding into a Race Power Boat. If you're looking for toy boats that really float, this set is a great choice.Unique toys and immersive building experiencesLEGO Technic sets are ideal for LEGO fans looking for a new challenge. They offer an advanced building experience for kids and adults who enjoy learning new engineering skills – or simply love to build.
  • Take to the water with this racing Catamaran floating toy sailboat. Packed with realistic features, it includes 2 sails, 2 dagger boards and rudder.
  • Ideal for developing engineering skills, this 2-in-1 model sailboat kit lets kids build, play and rebuild, giving an introduction to how boats really work.
  • Master the tactics of a world-class speed-sailor. Angle the sails for the ultimate racing position. Raise and lower the 2 dagger boards to maximize stability. Then use the rudder to steer.
  • Looking for the best gifts for a toy boat fan? This LEGO® Technic™ Catamaran (42105) is a great choice. Designed for ages 8+, it’s ideal for LEGO fans looking for a new challenge, or for anyone with a passion for sailing.
  • At over 12” (32cm) long, 8” (22cm) wide and 17” (44cm) high (from the bottom of the rudder to the top of the mast), this model sailboat is made for easy handling in the bathtub.
  • Who needs batteries when you've got sails? Certainly not this LEGO® Catamaran! It's powered by imagination, so no batteries are required.
  • Get building straightaway with full instructions for the Catamaran in the box. Ready to build the Race Power Boat? You’ll find extra instructions for this online.
  • Young LEGO® fans can discover a whole new world of building fun with LEGO Technic™ plastic model kits. With cool vehicle designs and realistic functions, the action goes on long after the model is built.
  • LEGO® building bricks are designed to the highest industry standards. LEGOTechnic™ building kits are consistent, compatible and connect easily every time.
  • LEGO® Technic™ pieces go through robust testing to make sure every building set meets the highest global safety and quality standards.

Compare Similar Sets

The Catamaran offers a unique floating element not found in many Technic sets. Compared to sets like the Race Truck (42104), it provides a different building experience focused on nautical engineering. While the Ocean Explorer (42064) offers a more complex build, the Catamaran is a more affordable and accessible option for those new to Technic or interested in boats.

📦 Full Parts Inventory - 66 unique parts • 375 total pieces

Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Technic Axle Pin ...
Part #: 11214 Red
Technic Panel Fairing #21 5L Small Smooth, Side B Technic Panel Fai...
Part #: 11946 Black
Technic Panel Fairing #21 5L Small Smooth, Side B Technic Panel Fai...
Part #: 11946 Lime
Technic Panel Fairing #22 5L Small Smooth, Side A Technic Panel Fai...
Part #: 11947 Black
Technic Panel Fairing #22 5L Small Smooth, Side A Technic Panel Fai...
Part #: 11947 Lime
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise Technic Pin Conne...
Part #: 15100 Dark Bluish Gray
Technic Axle 5 with Stop Technic Axle 5 wi...
Part #: 15462 Reddish Brown
Steering Wheel Small, 2 x 2 [Reinforced] Steering Wheel Sm...
Part #: 16091 Black
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Technic Gear 20 T...
Part #: 18575 Tan
Technic Pin Connector Round 1L [Beam] Technic Pin Conne...
Part #: 18654 Light Bluish Gray
Technic Driving Ring Connector Technic Driving R...
Part #: 18948 White
Technic Pin Connector Hub with 1 Axle Technic Pin Conne...
Part #: 22961 Light Bluish Gray
Technic Axle 11 Technic Axle 11
Part #: 23948 Yellow
Technic Axle 3 with Stop Technic Axle 3 wi...
Part #: 24316 Reddish Brown
Technic Axle Towball Technic Axle Towball
Part #: 2736 Light Bluish Gray
Technic Pin with Friction Ridges Lengthwise and Center Slots Technic Pin with ...
Part #: 2780 47× Black
Technic Worm Gear Short Technic Worm Gear...
Part #: 27938 Dark Bluish Gray
Technic Pin Connector Hub with 2 Axles Technic Pin Conne...
Part #: 27940 Dark Bluish Gray
Technic Axle and Pin Connector Angled #1 Technic Axle and ...
Part #: 32013 Dark Bluish Gray
Technic Axle and Pin Connector Angled #6 - 90° Technic Axle and ...
Part #: 32014 Dark Bluish Gray
Technic Axle and Pin Connector Angled #2 - 180° Technic Axle and ...
Part #: 32034 Dark Bluish Gray
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Technic Pin Long ...
Part #: 32054 Light Bluish Gray
Technic Beam 3 x 3 L-Shape Thin Technic Beam 3 x ...
Part #: 32056 Dark Bluish Gray
Technic Axle 2 Notched Technic Axle 2 No...
Part #: 32062 15× Red
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Technic Bush 1/2 ...
Part #: 32123b Light Bluish Gray
Technic Beam 2 x 4 L-Shape Thick Technic Beam 2 x ...
Part #: 32140 Lime
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Technic Axle and ...
Part #: 32184 Dark Bluish Gray
Technic Gear 12 Tooth Double Bevel Technic Gear 12 T...
Part #: 32270 Black
Technic Beam 1 x 15 Thick Technic Beam 1 x ...
Part #: 32278 Dark Bluish Gray
Technic Beam 1 x 15 Thick Technic Beam 1 x ...
Part #: 32278 Lime
Technic Axle and Pin Connector Perpendicular Double Technic Axle and ...
Part #: 32291 Light Bluish Gray
Technic Link 1 x 9 Technic Link 1 x 9
Part #: 32293 Black
Technic Beam 1 x 5 Thick Technic Beam 1 x ...
Part #: 32316 Lime
Technic Beam 1 x 5 Thick Technic Beam 1 x ...
Part #: 32316 Dark Bluish Gray
Technic Beam 1 x 7 Bent (4 - 4) Thick Technic Beam 1 x ...
Part #: 32348 Dark Bluish Gray
Technic Beam 1 x 3 Thick Technic Beam 1 x ...
Part #: 32523 Dark Bluish Gray
Technic Beam 1 x 3 Thick Technic Beam 1 x ...
Part #: 32523 White
Technic Beam 1 x 3 Thick Technic Beam 1 x ...
Part #: 32523 Lime
Technic Beam 1 x 7 Thick Technic Beam 1 x ...
Part #: 32524 Dark Bluish Gray
Technic Beam 1 x 11 Thick Technic Beam 1 x ...
Part #: 32525 Dark Bluish Gray
Technic Beam 1 x 11 Thick Technic Beam 1 x ...
Part #: 32525 Lime
Technic Beam 3 x 0.5 Liftarm with Boss and Pin Semi-Reduced Technic Beam 3 x ...
Part #: 33299b Black
Technic Axle 4 Technic Axle 4
Part #: 3705 Red
Technic Axle 6 Technic Axle 6
Part #: 3706 Black
Technic Bush Technic Bush
Part #: 3713 Light Bluish Gray
Technic Axle 10 Technic Axle 10
Part #: 3737 Black
Technic Axle Pin without Friction Ridges Lengthwise Technic Axle Pin ...
Part #: 3749 Tan
Technic Beam 1 x 9 Thick Technic Beam 1 x ...
Part #: 40490 White
Technic Beam 1 x 13 Thick Technic Beam 1 x ...
Part #: 41239 Dark Bluish Gray
Technic Axle and Pin Connector Perpendicular Double Split Technic Axle and ...
Part #: 41678 Light Bluish Gray
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Technic Axle and ...
Part #: 42003 Orange
Technic Axle Connector with Axle Hole [Reinforced] Technic Axle Conn...
Part #: 42135 Black
Technic Pin 1/2 Technic Pin 1/2
Part #: 4274 Light Bluish Gray
Technic Axle Pin with Friction Ridges Lengthwise Technic Axle Pin ...
Part #: 43093 33× Blue
Technic Axle 7 Technic Axle 7
Part #: 44294 Yellow
Technic Axle 3 Technic Axle 3
Part #: 4519 Light Bluish Gray
Technic Pin Connector Hub Perpendicular 3L with 4 Pins Technic Pin Conne...
Part #: 48989 Light Bluish Gray
Technic Axle Connector Smooth [with x Hole + Orientation] Technic Axle Conn...
Part #: 59443 10× Dark Bluish Gray
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Technic Beam 1 x ...
Part #: 60483 Black
Technic Beam 3 x 3 T-Shape Thick Technic Beam 3 x ...
Part #: 60484 Dark Bluish Gray
Technic Axle 9 Technic Axle 9
Part #: 60485 Light Bluish Gray
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Clear
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Red
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Green
Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Technic Beam 5 x ...
Part #: 64178 Light Bluish Gray
Technic Gear Rack 1 x 13 with Axle and Pin Holes Technic Gear Rack...
Part #: 64781 Black
Technic Axle and Pin Connector Perpendicular Technic Axle and ...
Part #: 6536 White
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Technic Pin Long ...
Part #: 6558 17× Blue
Boat / Pontoon 36 x 7 x 7 with Blue Bottom Boat / Pontoon 36...
Part #: 65781 Lime
Technic Pin with Friction Ridges Lengthwise and Towball Technic Pin with ...
Part #: 6628 14× Black
Technic Beam 1 x 3 Thin Technic Beam 1 x ...
Part #: 6632 12× Dark Bluish Gray
Technic Beam 1 x 3 Thin Technic Beam 1 x ...
Part #: 6632 White
Sail, Triangular, with 'Kool Keels Anchor Bouy', '42105', and Waves with Dots Print Sail, Triangular,...
Part #: 66645a [No Color/Any Color]
Sail, Triangular, with Waves with Dots Print Sail, Triangular,...
Part #: 66645b [No Color/Any Color]
Technic Axle 4 with Stop Technic Axle 4 wi...
Part #: 87083 Dark Bluish Gray
Technic Rotor Blade Small with Hole and Axle Connector End Technic Rotor Bla...
Part #: 99012 Dark Bluish Gray
The set features a good selection of Technic pins and axles, useful for MOC builders needing these essential connection pieces. The dark bluish gray beams provide structural support and aesthetic appeal.

💎 Notable Parts

Black Technic Pin with Friction Ridges Lengthwise and Center Slots (47x) $2.35
Blue Technic Axle Pin with Friction Ridges Lengthwise (33x) $1.65
Dark Bluish Gray Technic Beam 1 x 15 Thick (7x) $1.40
Est. BrickLink Part Value
$5.40

💡 MOC Potential

🚢 Transform into a smaller, more agile racing yacht.
🚗 Convert into a land-based vehicle with a sail-powered engine.
🌳 Create a floating research platform with scientific instruments.

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Charts Inventory Statistics

66
Unique Parts
340
Total Pieces
0
Minifigures
Inventory Version: 2