In 1911 a biplane with an 18-foot wingspan was designed and built by Lennert in the USA.
Willie Lennert flew in his 18 ft. wing span Lennert Biplane (similar to a Demoiselle-type monoplane but with a second wing added below) powered by a Lennert 20 h.p. engine.
The first non-fatal accident at Cicero occurred in June 1911, to Willie Lennert while he was attempting to fly his small self-built Lennert Biplane.
All Aero 