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In early 2007 Rotron founder and chief technology officer, Gilo Cardozo, pursued a childhood dream: to fly a paramotor 30,000ft over the summit of Everest.
Having teamed up with friend and TV personality Bear Grylls, Cardozo had just seven months to build two paramotors. The most powerful paramotor engine available was barely producing 30hp and was far too heavy to launch at the desired altitude. So, he also set about building a four-stroke rotary engine that was more compact and 50 per cent lighter than a piston engine equivalent.
The basis of the Everest engine was a 294cc single rotor engine producing 40hp as a standard normally aspirated engine.
The engine included a miniature centrifugal supercharger fitted with a miniature intercooler to ensure the air was as cold and dense as possible when entering the combustion chamber. The supercharger was modified to be spun at up to 200,000rpm in order to simulate sea level atmospheric pressure of 1 bar at 30,000ft.
To eliminate the problem of icing, the supercharger was placed before the fuel delivery system. The heated and supercharged air was then sent through an intercooler before passing the injector at an average of 25 degrees Celsius.
After four months of design, development, testing and manufacturing, the engine was finally ready. With just two days before departure, the second engine was completed.
On 14 May 2007 the two pilots took off and in a flight that lasted four hours they achieved a paramotoring world record of 29,494 feet.
On completion of the expedition and building on its success, Cardozo continued to develop his rotary engine and looked for a commercial platform for the technology. Rotron Power was born.

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