Aircraft
The aircraft in the contest were popular sport planes of the late twenties years, like de Havilland Gipsy Moth (DH-60G), which was the main aircraft of the British team. These aircraft had mostly open cabs, built in low-wing, high-wing or biplane layout. Unlike in the following years, there were no aircraft built specially for a Challenge contest yet, only the Czech Avia BH-11B's "Antilopa" were improved by adding folding wings. All aircraft in the contest had fixed landing gear and had no wing mechanization yet. The most numerous were German BFW M.23b (9 aircraft) and Klemm (6 of the L.25 Ia model, including 2 in the Swiss team, and 2 of the L.26 model). BFW's and Klemms were wooden low-wing planes with open two-seater tandem cabins.
Read more about this topic: Challenge International De Tourisme 1929