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New Lego Building Toy Technic Twin-Rotor Helicopter Model Kit 145-Piece 42020 !

Model: 42020
Average Rating:out of 5 stars
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About This Item


This toy is not suitable for ages under 3 years. It contains one or more of the following items marbles; small ball; or small parts.
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.
New Item, packaging has imperfections

Key Features and Benefits:

  • Features linked spinning rotors, turning front wheel, opening cargo door and a cool rescue-theme design
  • Get familiar with the versatile Technic building elements
  • Taxi along the ground, spin the rotors and take off
  • Rotors are connected with gear wheels and spin together
  • 2-in-1 model: rebuilds into a single-rotor helicopter





Age Range
All Ages
Assembled Product Weight
Assembled Product Dimensions (L x W x H)
8.70 x 5.10 x 2.40 Inches

Customer Reviews

Average Rating:(4.5)out of 5 stars
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Frequent mentions

1-10 of 13 reviews
Average Rating:(5.0)out of 5 stars

Let your Technic career take off!

This is one of the best small Technic sets I've seen in recent years, and the only one I've bought; I usually buy the larger sets but this set has better value for money than usual for a small set, maybe because the wheels are small. The set has 3 functions: - Twin rotors that rotate in opposite directions like a Chinook helicopter and are actuated from the rear. These spin well as long as you make sure the parts rotate freely as you build. - Swivelling front wheels for taxiing. - Opening rear cargo ramp. Pros: - Good parts for small aircraft models. - Very swooshable! - Small enough to be swooshed during a long car journey. - 4 wheels are provided so a car could be built from the parts. - This is a good set to buy in multiple if you need the the rotor blades, the gear brackets or the small wheels, which are very useful for guiding sliding things (see crane 42009). - More experienced builders can move on to the Cargo Plane 42025. I added the rotors from 42020 to my Cargo Plane to give it more-realistic 6-blade propellers. - Good value for money as small Technic sets go. Possible improvements: - The instructions did not advise any particular orientation of the two rotors relative to each other. This may be because they are at different heights and do not bend in the model, so they would not clash. On a real Chinook the rotor orientation is critical to keeping the blades apart; a gearbox failure could lead to a blade clash and loss of the aircraft. The set opens up opportunities like this to learn more about aircraft, making it an ideal accompaniment to a flight or an aircraft museum visit. - The rotor parts have good grip on the hub piece but there would be a limit to rotational speed if such a rotor were motorised in your own models. When I was young I used to put wheels or propellers on a motor and rev it up as fast as possible! This raises the opportunity to learn about robust rotor construction. In this case a 3-lobe piece like design ID 32125 could stop the blades detaching at high speed. This is an ideal introduction to the Technic theme for young engineers. Since some Technic sets used to start at 6 years old, perhaps a talented child younger than 7 could build it with supervision.

Average Rating:(5.0)out of 5 stars

this set is awesome!!!!!

these are the reasons why i like it.... 1. it has cool functions.'s a 2 in 1's bigger then i expected 4.there's nothing i don't like about it 5. there's a possible way to add power functions

Average Rating:(5.0)out of 5 stars

Good for special parts

I wasn't really planning to get this set. I just happened to go to ToysRUS with my son and then decided to get something simple. I first considered a few other sets but in the end went with this one because I wanted a few parts in this set that my son could use in other projects. Like the blades and the bevel gears. In many of the advanced models I built, I am quite used to the bevel gears and the U-shaped part to put the gears at right-angles. Having two of those available in this set makes this set good for gathering such parts. Of course, it's fun for kids to rotate the knob at the back and see two blades rotating simultaneously. Note: For a 6 to 8 yr old kid this set will be easy to average even though I gave "very easy" rating from my point of view.

Average Rating:(5.0)out of 5 stars


This helicopter helped me to think of ways to use spare gears and other parts to create minifigure body armory and spaceships.Later I took it apart to create a spaceship.

Average Rating:(5.0)out of 5 stars

Christmas Present

My nephew loves it.

Average Rating:(5.0)out of 5 stars


Don't impress you for the little dimension of this excellent Lego set. It has all the function that it needs: two rotors that really turn, an openable rear cargo door and a fantastic front wheel steering! Do you want more? Is easy to build but is a good compromess with his little price... it takes about 20 minuts to build.

Average Rating:(4.0)out of 5 stars

Good starting set!

This is a very good starting kit, good features for the price, easier to build of Technic lego products in my opinion, the only disadvantage is that the model is small compared to other vehicles but visually it's looking great, I recommend you to always be with your child if he's building himself cause there some very small pieces so happy building ! :) Like you see in the photo I build the model with double helix

Average Rating:(4.0)out of 5 stars


My five year old said he wasn't interested, but I was. This was a great reintroduction to the Technic models since the last time I played with them thirty years ago. After building it my son loves how the rotors spin with the gears.

We are glad to hear that your son enjoyed this TECHNIC build! Since he was such an (unexpected) fan, check out some of our pull back racers such as the Black Champion or the Desert Racer! If you are looking for more of a challenge with your little guy, the Construction Crew set (42023) comes with three builds, all with working parts similar to how they function in real life! Thanks for being such a big fan!
Average Rating:(4.0)out of 5 stars

Technic on the rise

This set is great! I loved it, except for a few minor accuracy details. I love lego, and am fascinated with helicopters and flying them. When I purchased the set, I was amazed at the level of accuracy for the size. Pros: great functionality and compactibility Cons: The rear wheels stick out too much and so do the side beams. Overall, it is very functional and cute; great for the price.

Average Rating:(3.0)out of 5 stars

Lego twin blade helicopter

Verified purchase

It was well worth the money I spent on the item. I would order again from them without any hesitation


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