# LEGO 42020-1 — Twin-rotor Helicopter (2014)

Source: https://www.brickmissing.com/sets/42020-1-twin-rotor-helicopter
Publisher: BrickMissing (https://www.brickmissing.com) — free LEGO parts checker. Not affiliated with the LEGO Group.

The LEGO Technic 42020-1 Twin-rotor Helicopter explores core mechanical principles within its 2014 Technic design. This model showcases linked spinning rotors, precisely connected by gear wheels, ensuring both rotors spin together during any operation. An opening cargo door supports rescue scenarios, while a turning front wheel enables ground maneuvering for realistic play. The helicopter features a clear rescue-theme design, reflected in its overall styling. As a versatile 2-in-1 model, it rebuilds into a single-rotor helicopter, providing an alternate construction. The finished Twin-rotor Helicopter measures 22 cm long, suitable for display alongside other Technic models.

## Set facts

- Set number: 42020-1
- Name: Twin-rotor Helicopter
- Theme: Technic
- Released: 2014
- Pieces: 145
- Distinct part + colour lots: 48
- Build difficulty: easy
- Repairability: 2.1% of this set's lots are hard to replace (1 of 48 part+colour combinations appear in three or fewer sets in the entire LEGO catalog).

## Complete parts list (48 lots, 145 pieces)

Prices are the official LEGO Pick a Brick price per individual part, where LEGO publishes one.

| Qty | Part | Colour | Part no. | LEGO element ID | LEGO price each |
| ---: | --- | --- | --- | --- | --- |
| 1 | Sticker Sheet for Set 42020-1 | Unknown | 16026 | 6056837 | — |
| 5 | Technic Pin with Friction Ridges Lengthwise and Center Slots | Black | 2780 | 278026 | — |
| 2 | Technic Beam 1 x 4 Thin with Stud Connector | Light Bluish Gray | 2825 | 6331574 | €0,21 |
| 4 | Technic Pin 3/4 | Tan | 32002 | 6013938 | €0,08 |
| 5 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] | Light Bluish Gray | 32054 | 4211865 | — |
| 5 | Technic Axle 2 Notched | Red | 32062 | 4142865 | €0,07 |
| 3 | Technic Axle 5 | Light Bluish Gray | 32073 | 4211639 | €0,11 |
| 4 | Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced | Light Bluish Gray | 32123b | 6271165 | €0,04 |
| 4 | Technic Beam 2 x 4 L-Shape Thick | Black | 32140 | 6271825 | €0,15 |
| 4 | Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole | Black | 32184 | 6276951 | €0,12 |
| 2 | Technic Beam 3 x 3 L-Shape with Quarter Ellipse Thin | Black | 32249 | 6336619 | €0,33 |
| 2 | Technic Gear 12 Tooth Double Bevel | Black | 32270 | 4177431 | €0,18 |
| 1 | Technic Beam 1 x 5 Thick | White | 32316 | 4249021 | €0,19 |
| 2 | Technic Beam 1 x 4 Thin | White | 32449 | 6360072 | €0,19 |
| 2 | Technic Beam 1 x 3 Thick | Black | 32523 | 4509376 | €0,10 |
| 2 | Technic Beam 1 x 7 Thick | Light Bluish Gray | 32524 | 4495930 | €0,25 |
| 2 | Technic Beam 1 x 11 Thick | Black | 32525 | 6390388 | €0,33 |
| 4 | Technic Beam 3 x 5 L-Shape Thick | Light Bluish Gray | 32526 | 4211713 | €0,24 |
| 1 | Technic Pin Long without Friction Ridges | Tan | 32556 | — | — |
| 2 | Technic Pin without Friction Ridges Lengthwise | Light Bluish Gray | 3673 | 4211807 | €0,05 |
| 6 | Technic Axle 4 | Black | 3705 | 370526 | €0,08 |
| 1 | Technic Axle 8 | Black | 3707 | 370726 | €0,22 |
| 4 | Technic Bush | Light Bluish Gray | 3713 | 6275844 | €0,05 |
| 2 | Technic Beam 1 x 9 Thick | White | 40490 | 6001831 | €0,29 |
| 2 | Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] | Trans-Clear | 41669 | 4611639 | — |
| 2 | Technic Beam 1 x 2 Thin | Black | 41677 | 6360123 | €0,13 |
| 6 | Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes | Light Bluish Gray | 42003 | 6273724 | €0,12 |
| 4 | Wheel 11 x 8 with Center Groove | Light Bluish Gray | 42610 | 4211758 | €0,11 |
| 12 | Technic Axle Pin with Friction Ridges Lengthwise | Black | 43093 | 4206482 | €0,06 |
| 1 | Technic Axle 7 | Light Bluish Gray | 44294 | 4211805 | €0,16 |
| 1 | Technic Axle 3 | Light Bluish Gray | 4519 | 4211815 | €0,05 |
| 4 | Tyre 14 x 6 Solid Smooth | Black | 50951 | 4246901 | €0,18 |
| 2 | Technic Axle Connector Hub with 3 Axles at 120° | Light Bluish Gray | 57585 | 4502595 | €0,28 |
| 2 | Technic Axle 5.5 with Stop [Rounded Short End] | Dark Bluish Gray | 59426 | 4508553 | €0,11 |
| 4 | Technic Axle Connector Smooth [with x Hole + Orientation] | Light Bluish Gray | 59443 | 4512360 | €0,06 |
| 1 | Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole | Black | 60483 | 6265091 | €0,07 |
| 2 | Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole | Light Bluish Gray | 60483 | 6265089 | €0,07 |
| 1 | Technic Axle and Pin Connector Perpendicular Triple | Light Bluish Gray | 63869 | 6331441 | €0,17 |
| 3 | Technic Axle and Pin Connector Perpendicular | White | 6536 | 6261372 | €0,10 |
| 6 | Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots | Black | 6558 | 4514553 | — |
| 2 | Technic Gear 12 Tooth Bevel | Tan | 6589 | 4565452 | €0,10 |
| 6 | Technic Beam 1 x 3 Thin | Black | 6632 | 6331723 | €0,25 |
| 1 | Technic Panel Fairing #1 Small Smooth Short, Side A | Black | 87080 | 4566266 | — |
| 2 | Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] | Black | 87082 | 4560174 | — |
| 2 | Technic Axle 4 with Stop | Dark Bluish Gray | 87083 | 6083620 | €0,07 |
| 1 | Technic Panel Fairing #2 Small Smooth Short, Side B | Black | 87086 | 4566265 | — |
| 2 | Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes | Black | 87408 | 6278412 | €0,47 |
| 6 | Technic Rotor Blade Small with Hole and Axle Connector End | Dark Bluish Gray | 99012 | 6271639 | €0,30 |

## Notes

- Track which of these parts you own and see what is missing: https://www.brickmissing.com/sets/42020-1-twin-rotor-helicopter
- Inventory data is based on official LEGO inventories via the Rebrickable catalog, updated daily.
- Part images, minifigure lists and related sets are on the set page: https://www.brickmissing.com/sets/42020-1-twin-rotor-helicopter