A few weeks ago I finished the build and maidened the Cooler autogyro this week.
I always was a fan of autogyros, ever since I saw 'You only live twice' as a child on TV, where James Bond flys the 'Little Nellie'. An autogryo flies a lot like a normal airplane, but as the rotor is not powered and only driven by the airflow the pilots job is to make sure it never stops rotating. As a bonus you cannot stall an autogyro and in a light wind it can do 'on-the-spot' landings.
The Cooler is normally made using a PET bottle. I choose to cover the fuselage with balsa and paper instead and add some scale looking touches.
Link to the video, rough grass demanded a punch-up start: