I think the designations L1, L2 and L3 for the Loutzkoy types are doubtful.
Only the first Loutzkoy plane was built by Daimler (even if there is a different opinion), and it was not a plane conceived by Daimler, but designed and ordered by Loutzkoy.
Publications about Loutzkoy are sometimes contradictory (and have always been since the 1910's).
The Russian engineer Boris Lutsky or Lutskoy (Борис Григорьевич Луцкий/Луцкой - both variants are correct) was in the first place occupied with engine and automobile construction, and worked at the end of the 19 th - beginning of the 20th century for a number of German companies, including Argus and Daimler. His German-style name was Boris Loutzkoy (and even Boris von Loutzkoy).
Due to his involvement in Argus and Daimler engines Loutzkoy came also to aviation around 1908-09.
From different sources (see below) I came to the following:
There were two original Loutzkoy types, and a third prepared by Loutzkoy for a flight from Berlin to St. Petersburg.
1. The 1909-10 unsuccesful twin-engined monoplane, called in Russian Геликоплан, an early VTOL-plane conceived by Loutzkoy and built by Daimler. Only Lange says it was built by Aeroplan-Fabrik Max Schuler in Berlin…
2. The 1912 twin-engined Rumpler-Loutzkoy Taube, built by Rumpler. Only Sobolev says Daimler participated in the building ("при участии фирмы Даймлер")...
3. The 1913 single engined Taube reengined by Loutzkoy for the flight to St. Petersburg.
Any additions welcome!
Sources:
- Шавров В.Б., История конструкций самолетов в СССР до 1938г. (1986, 3th ed.), p. 130-133
Соболев Д.А., "Изобретатель Луцкой", Крылья Родины, 1994 № 2, p. 14
Kranzhoff J.A., Edmund Rumpler - Wegbereiter der industriellen Flugzeugfertigung (2004), p. 180-183
Lange B., Typenhandbuch der deutschen Luftfahrttechnik (1986), p. 34 and 81
And a number of Russian internetsites.