Only two of these were built, specifically for the 1925 round Germany flight. They were powered, like the single engine L20, by a pair of Ferdinand Porche designed Mercedes F7502 19 h.p air cooled flat twin engines. Flown by Bruno Loerzer L21 D-623 came first in it's class winning 25,000 Goldmarks with the two single engined L.20 aircraft coming second and third and sharing a further 25,000 Goldmarks between them. The picture above shows D-623 and Bruno Loerzer second on the left.
Span 35'5" Length 17'9" Wing area 141 sq ft
Empty weight 805 lb Loaded weight 1,045 lb
Max speed 81 mph Cruising speed 68 mph Service ceiling 11,500 ft