Klemm L.25, later Klemm Kl 25 was a successful Germany low-winged, centilevered light leisure and training aircraft, developed in 1928. More than 600 aircraft were built, and manufacturing licenses were sold to the United Kingdom and the United States.
The aircraft was developed by Hanns Klemm who used his previous design, the Klemm Kl 20, as a starting point. About thirty Kl 25 different versions were made, and these were equipped with engines ranging from 32 kW to 70 kW. The fuselage was covered with plywood.
Depending on the model, the aircraft's weight was 620 to 720 kilograms, had a 10.5 m to 13 m wingspan. Take-off was achieved at only 50 km/h and the maximum speed was between 150 and 160 km/h.
In relation to other, similar aircraft of the time, the assembly was very easy, which made it a very popular aircraft. According to the sales broschures, only 25% of the engines's power was needed to keep the aircraft flying, compared to similar-type biplanes, which required 50% engine power.