The Lambach HL.1 was a one-off, simple tandem two seat trainer designed and built by members and ex-members of the Delft Student Aeroclub (DSA) in the Netherlands in the mid-1930s.
When in the early 1930s members of the DSA were trying to bring down the costs of tuition they decided that in the absence of public finance they would build their own aircraft.
(Hugo) Lambach, a former DSA member, was asked to design a machine which would be cheap to produce and operate.
In March the DSA transferred it to the Nationale Luchtvaartschool (National Flying School) at Ypenburg Airport where it served until the Germans invaded the Netherlands on 10 May 1940.
The aircraft began to degrade after being moved out of its hangar by German forces and it was eventually handed back to the Technical University of Delft for instructional purposes, where it was dismantled.