asteroza + helicopter + tailsitter   6

https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110011311.pdf
The original Puffin electric VTOL tailsitter personal general aviation vehicle paper from NASA.
NASA  PUFFIN  electric  VTOL  tailsitter  personal  helicopter  vehicle  transportation  research  technology  aircraft  aviation  general  Delicious 
february 2017 by asteroza
Unmanned Systems Australia
Google X's tailsitter cargo UAV work is being done with these guys.
google  tailsitter  VTOL  quadrotor  quadcopter  helicopter  UAV  cargo  package  delivery  drone  research  technology  australia  Delicious 
august 2014 by asteroza

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