The Datwyler Bucker/Dubs Lerche R-180 is a Swiss single/two-seater aerobatic biplane developed from the Bucker Bu 131 and first flown in 1963. The Datwyler Bucker/Dubs Lerche R-180 is a wire-braced biplane powered by a Lycoming IO-360-B1B four-cylinder horizontally-opposed air-cooled engine providing a top speed of 220 kmh and a range of 500 km. Found on http://www.probertencyclopaedia.com/browse/IL.HTM