Additional Puffin papers were published on September 13th at the 10th AIAA ATIO Conference, NASA Puffin Electric Tailsitter VTOL Concept[3] and Puffin Redundant Electric Powertrain System.[4] This was fast followed in 2011 by several industry efforts, namely the AugustaWestland Project Zero (Italy), the Volocopter VC1 (Germany) and the Opener BlackFly (US).[5] It was officially introduced by the Vertical Flight Society and the American Institute of Aeronautics and Astronautics (AIAA) in 2014 during the "Transformative Vertical Flight Concepts Joint Workshop on Enabling New Flight Concepts through Novel Propulsion and Energy Architectures" held in Virginia.[6]