- 1.75 inches diameter (app. 44 mm); 4.5 mm thickness
- turnable inner part (turbine)
- Prefix: RO
- trackable with its own Icon at Geocaching.com:
Henri Marie Coanda (7 June 1886 – 25 November 1972) was a Romanian inventor, aerodynamics pioneer and builder of an experimental aircraft, the Coanda-1910 described by Coanda in the mid-1950s as the world's first jet, a controversial claim disputed by some and supported by others. He invented a great number of devices, designed a "flying saucer" and discovered the Coanda effect of fluid dynamics.
In 1910, in the workshop of Gianni Caproni, he designed and built an aircraft known as the Coanda-1910, which he displayed publicly at the second International Aeronautic Salon in Paris that year. The plane used a 4-cylinder piston engine to power a rotary compressor which was intended to propel the craft by a combination of suction at the front and airflow out the rear instead of using a propeller. Contemporary sources describe the Coanda-1910 as incapable of flight, but Rolf Sonnemann and Klaus Krug from the University of Technology of Dresden, mentioned in passing in their 1987 book Technik und Technikwissenschaften in der Geschichte (Technology and Technical Sciences in History) that the Coanda-1910 was the world's first jet.
In the years between the wars, he continued traveling and inventing. In 1934 he was granted a French patent related to the Coanda Effect. During early 1930 he used the same principle as the basis for the design of a jet-powered disc-shaped aircraft called "Aerodina Lenticulara". A small scale model was tested and it flew in 1932 and in 1935 Coanda obtain a patent for his design.
The coin features the design of the disc-shaped aircraft on one side, and a reminder of his contribution to jet development on the other side.
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