Set Facts
- 2-in-1 model: rebuilds into a single-rotor helicopter.
- Twin-rotor Helicopter measures 3” (8cm) high, 8” (22cm) long and 5” (13cm) wide
- Twin Rotor Helicopter was designed by LEGO designer Milan Reindl.
Regional Retail Prices (LEGO.com/Store)
Twin Rotor Helicopter Reviews
Brickset
“This is an excellent small model as an introduction to Technic build techniques for the younger builder. It rewards the builder with great play value, and the parts offer great flexibility for other things one might want to build. I might get another one for the parts.”
Full review at brickset.com
BrickEconomy Expert Review
“The Twin Rotor Helicopter offers a simple build with basic Technic functionality, including linked rotor movement via a rear knob, an opening cargo bay, and rolling wheels. While the build process is straightforward, the set includes a solid mix of useful parts like helicopter blades and connectors. It's a functional entry-level model that’s best suited for younger builders or as a low-cost parts pack.”
Theme Analysis
Lifespan
21 mos (this set 19 mos)
Annual growth
+3.97% (this set +6.12%)
This set's annual growth (CAGR) vs. subtheme
Community Stats
Twin Rotor Helicopter currently ranks #127 out of the top most owned sets in Technic.
About Technic

TECHNIC is one of The LEGO Company's main lines based on creating detailed model machines and mechanical toys with specialized beams, axles, gears and connectors. The theme was first introduced as the Expert Builder series in 1977, but was officially renamed as TECHNIC in 1984.
Summary
Technic Twin Rotor Helicopter set 42020 was released on May 27, 2014, retailing for $13, it has since been retired. New, unopened sets are valued at $40, used ones can be found for $5.
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Get your LEGO Technic model building off to a flying start with the 2-in-1 Twin-rotor Helicopter. Featuring linked spinning rotors, an opening cargo door and cool rescue styling, this great model offers just the right level of challenge for first-time builders. It also has a turning front wheel for easy maneuvering on the ground.
Rebuilds into a single-rotor helicopter. 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
Description provided by LEGO©