Smash the waves!
Build the Hydroplane Racer

Experience the thrill of high-speed racing with this aerodynamic 180-piece LEGO Technic set. A fun and engaging 2-in-1 build that transforms into a Race Boat!

Breaking News

Cleaned and reorganized the shelves!

r/legotechnic about 2 hours ago

Got some of the new sets

r/legotechnic about 2 hours ago

Audi F1

r/legotechnic about 3 hours ago
🏛 Technic
Set #42045

Hydroplane Racer

The Hydroplane Racer is a surprisingly fun little Technic set.

🏆 Best For: Perfect for kids and teens interested in learning basic Technic principles ⏱ 1.5 hr build 🧩 180 pcs 🎂 Ages 8+
★★★☆☆ 3.4 from 1 reviews

Generally well-received as a good starter Technic set, though some feel it's a bit simple for experienced builders. The working piston engine is a highlight, but some find the building experience somewhat repetitive.

MSRP
$19.99
Best Price
$21.78
View on

📝 Our Take

The Hydroplane Racer is a surprisingly fun little Technic set. Despite its small size, it packs in some clever engineering and a vibrant color scheme that makes it stand out. The working piston engine is a delightful touch, showcasing the core principles of Technic in an accessible way.

This set is perfect for younger builders or anyone looking for a quick and satisfying Technic build. With under 200 pieces, it's a great introduction to gears, axles, and other fundamental Technic elements. The alternate build as a race boat adds to the play value and learning opportunities.

Skip this if you're an experienced Technic builder looking for a complex and challenging project. This set is geared towards beginners, so you might find it too simplistic. Consider larger Technic sets with more intricate mechanisms for a more engaging experience.

✨ New
BlockTalk

Ask BlockTalk about this set

AI assistant with full set data

Powered by AI
BlockTalk
BlockTalk
Hi! I'm BlockTalk, your LEGO expert. Ask me anything about the Hydroplane Racer - building tips, investment potential, comparisons, or anything else!
Try asking:
How does this set compare to other entry-level Technic models? What are the key mechanical principles demonstrated in this set? Is this set a good value for its price and piece count? How durable is the built model for play and display?

🧱 Building Experience

🧩
180
Pieces
1.5h
Build Time
📊
Beginner
Difficulty
👤
8-14
Ages
Build Highlights:
  • Simple and straightforward construction
  • Working piston engine mechanism
  • Introduction to gears and axles
  • Alternate build provides additional play value

📈 Investment Analysis

→ Price stable
C+
Investment Grade
⏳ Active
The Hydroplane Racer, being a smaller, retired Technic set, presents a mixed investment profile. Its initial low MSRP makes it accessible, but its piece count limits its potential for significant appreciation. The Technic theme generally holds value, especially for sets with unique parts or functions. While not a high-return investment, it may see modest gains over time, especially if kept sealed and in excellent condition. However, larger, more complex Technic sets tend to perform better in the long run.

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

📖 About This Set

Thunder over the ocean with the Hydroplane Racer!

Smash water speed records with this amazing, aerodynamic 2-in-1 model, featuring massive sponsons, large cockpit and a blue and white color scheme with sporty black-and-white checkered racing stickers. Maneuver this powerful machine to the starting line and see the propeller and engine pistons spring into action. Now get ready to race! When you feel like another building challenge, rebuild it into a high-speed Race Boat. Interactive, 3D Digital LEGO® Building Instructions app available online, for both models!

  • Features a unique aerodynamic design with huge sponsons, large cockpit, detailed engine with moving pistons and a spinning propeller.
  • Check out the blue and white color scheme with sporty black-and-white checkered racing stickers.
  • Maneuver the Hydroplane Racer and see the engine and propeller spring to life.
  • This LEGO Technic model is designed to provide an immersive and rewarding building experience.
  • Appropriate for children aged 8 to 14.
  • Interactive, 3D Digital LEGO Building Instructions app available online for both A and B models.
  • 2-in-1 model: rebuilds into a Race Boat.
  • Hydroplane Racer measures over 2” (6cm) high, 9” (23cm) long and 5” (13cm) wide.
  • Race Boat measures over 2” (6cm) high, 8” (21cm) long and 3” (10cm) wide.

Compare Similar Sets

Compared to other small Technic sets, the Hydroplane Racer offers a good introduction to basic mechanisms. Sets like the Getaway Racer (42046-1) provide a similar building experience at a comparable price point. However, the Hydroplane Racer's vibrant color scheme and working piston engine might appeal more to some builders. For those seeking a slightly more complex build, the Quad Bike (42034-1) offers additional challenges.

📦 Full Parts Inventory - 59 unique parts • 151 total pieces

Technic Gear 8 Tooth [Reinforced] Technic Gear 8 To...
Part #: 10928 Dark Bluish Gray
Technic Axle 5 with Stop Technic Axle 5 wi...
Part #: 15462 Dark Tan
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Technic Axle Pin ...
Part #: 18651 Black
Technic Panel Curved 3 x 13 Technic Panel Cur...
Part #: 18944 Blue
Technic Panel Curved and Bent 6 x 3 Technic Panel Cur...
Part #: 24116 Blue
Sticker Sheet for Set 42045-1 Sticker Sheet for...
Part #: 24732 [No Color/Any Color]
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Plate Round 2 x 2...
Part #: 2654 Blue
Technic Pin with Friction Ridges Lengthwise and Center Slots Technic Pin with ...
Part #: 2780 Black
Technic Wedge Belt Wheel Tire Technic Wedge Bel...
Part #: 2815 Black
Technic Engine Cylinder without Side Slots, with Bottom Slots Technic Engine Cy...
Part #: 2850b Light Bluish Gray
Technic Engine Piston Round Technic Engine Pi...
Part #: 2851 Yellow
Technic Engine Connecting Rod Technic Engine Co...
Part #: 2852 Light Bluish Gray
Technic Engine Crankshaft Technic Engine Cr...
Part #: 2853 Yellow
Technic Engine Crankshaft Center Technic Engine Cr...
Part #: 2854 Tan
Technic Brick 1 x 2 [2 Pin Holes] Technic Brick 1 x...
Part #: 32000 Black
Technic Pin 3/4 Technic Pin 3/4
Part #: 32002 Tan
Technic Axle and Pin Connector Angled #1 Technic Axle and ...
Part #: 32013 White
Technic Axle Connector with Axle Hole Technic Axle Conn...
Part #: 32039 Black
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 Black
Technic Axle 2 Notched Technic Axle 2 No...
Part #: 32062 Red
Technic Axle 5 Technic Axle 5
Part #: 32073 Light Bluish Gray
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Technic Bush 1/2 ...
Part #: 32123b Yellow
Technic Beam 2 x 4 L-Shape Thick Technic Beam 2 x ...
Part #: 32140 Blue
Technic Beam 2 x 4 L-Shape Thick Technic Beam 2 x ...
Part #: 32140 White
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Technic Axle and ...
Part #: 32184 Light Bluish Gray
Technic Gear 20 Tooth Bevel Technic Gear 20 T...
Part #: 32198 Tan
Technic Gear 12 Tooth Double Bevel Technic Gear 12 T...
Part #: 32270 Black
Technic Beam 1 x 4 Thin Technic Beam 1 x ...
Part #: 32449 Black
Technic Beam 1 x 3 Thick Technic Beam 1 x ...
Part #: 32523 White
Technic Beam 1 x 7 Thick Technic Beam 1 x ...
Part #: 32524 Blue
Technic Beam 1 x 11 Thick Technic Beam 1 x ...
Part #: 32525 White
Axle Hose, Soft 7L Axle Hose, Soft 7L
Part #: 32580 Black
Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Technic Beam 3 x ...
Part #: 33299a Light Bluish Gray
Technic Gear 24 Tooth [New Style with Single Axle Hole] Technic Gear 24 T...
Part #: 3648b Dark Bluish Gray
Technic Axle 4 Technic Axle 4
Part #: 3705 Black
Technic Bush Technic Bush
Part #: 3713 Light Bluish Gray
Technic Axle Pin without Friction Ridges Lengthwise Technic Axle Pin ...
Part #: 3749 Tan
Technic Beam 1 x 13 Thick Technic Beam 1 x ...
Part #: 41239 Black
Technic Wedge Belt Wheel [aka Pulley] Technic Wedge Bel...
Part #: 4185 Light Bluish Gray
Technic Axle Pin with Friction Ridges Lengthwise Technic Axle Pin ...
Part #: 43093 Blue
Technic Axle 7 Technic Axle 7
Part #: 44294 Yellow
Technic Axle 3 Technic Axle 3
Part #: 4519 Light Bluish Gray
Technic Axle and Pin Connector, Perpendicular with Extension Technic Axle and ...
Part #: 53586 Flat Silver
Wheel 31 x 15 Technic, 7 Pin Holes Wheel 31 x 15 Tec...
Part #: 60208 White
Propeller 3 Blade 3 Diameter with Axle Cross Propeller 3 Blade...
Part #: 6041 Black
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Technic Beam 1 x ...
Part #: 60483 Dark Bluish Gray
Technic Axle 9 Technic Axle 9
Part #: 60485 Light Bluish Gray
Technic Pin Connector Round [Slotted] Technic Pin Conne...
Part #: 62462 Light Bluish Gray
Technic Axle and Pin Connector Perpendicular Triple Technic Axle and ...
Part #: 63869 Light Bluish Gray
Technic Panel Fairing # 4 Small Smooth Long, Side B Technic Panel Fai...
Part #: 64391 White
Technic Panel Fairing #17 Large Smooth, Side A Technic Panel Fai...
Part #: 64392 White
Technic Panel Fairing #6 Long Smooth, Side B Technic Panel Fai...
Part #: 64393 White
Technic Panel Fairing #5 Long Smooth, Side A Technic Panel Fai...
Part #: 64681 White
Technic Panel Fairing #18 Large Smooth, Side B Technic Panel Fai...
Part #: 64682 White
Technic Panel Fairing # 3 Small Smooth Long, Side A Technic Panel Fai...
Part #: 64683 White
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 Blue
Technic Beam 1 x 3 Thin Technic Beam 1 x ...
Part #: 6632 White
Technic Axle 4 with Stop Technic Axle 4 wi...
Part #: 87083 Dark Bluish Gray
The set includes a good selection of Technic pins and connectors, useful for MOC builders looking to add functionality to their creations. The light bluish gray engine components are also valuable for creating custom engine designs.

💎 Notable Parts

Light Bluish Gray Technic Engine Connecting Rod (4x) $0.60
Yellow Technic Engine Piston Round (4x) $0.80
Light Bluish Gray Technic Engine Cylinder without Side Slots, with Bottom Slots (4x) $0.60
Est. BrickLink Part Value
$2.00

💡 MOC Potential

🚗 Small off-road buggy with suspension
🚗 Miniature tractor with working steering
🤖 Simple walking robot with gear-driven legs

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Searching for YouTube reviews...

This may take a moment

📖 Building Instructions 4

Hydroplane Racer Instructions
BI 3004 60, 42045 1/2 V29
Download PDF
Hydroplane Racer Instructions
BI 3004 60, 42045 1/2 V39
Download PDF
Hydroplane Racer Instructions
BI 3004/48, 42045 2/2 V29
Download PDF
Hydroplane Racer Instructions
BI 3004/48, 42045 2/2 V39
Download PDF

Charts Inventory Statistics

59
Unique Parts
151
Total Pieces
0
Minifigures
Inventory Version: 1