The HFL Flugzeugbau Stratos 300 is a single-seat pusher design ultralight aircraft with twin tail boom and König 3 cylinder radial engine. The out of glass fibre strengthened synthetic built "Stratos" was a product of HFL Flugzeugbau GmbH from Luneburg in Germany. The length of the Stratos 300 is 6,3 meters; the wingspan is 12,60 meters. An small air-cooled 3-cylinder, 2-stroke König SC-430 engine drives a 4-blade folding propeller from Herz, which propels the ultralight forward with thrust from the rear. The three-cylinder König radial engine with 430 cc produces approximately 22 hp at 4200 rpm, weighs 17 kg, and consumes approximately 9.5 l/h of premium gasoline. The cruise speed of the Statos is 92 km/h; the maximum speed is 120 km/h. Through the large wing surface the Stratos can be flown with a minimum speed of 45 km/h and acts as an ultralight motorglider.

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