First flight of a lateral tandem rotor configuration (Focke-Wulf Fw 61)
Friday, June 26, 1936
- Bremen Airport, Germany 
This is a Notable Technology milestone.
Description:
The first 'free' flight of a VTOL aircraft with 2 main rotors side by side. Ewald Rolfs was the pilot. The aircraft would become the first fully operational helicopter in the world.
Source: "Vertical Flight Historic Aerospace Sites | Bremen Airport, Bremen, Germany (2011)", AHS web page, Last updated: March 18, 2015
