Aircraft
The Challenge was to be a contest of tourist aircraft, so competing aircraft had to be able to take at least two persons aboard, take off and land on a short field and cover a distance with a good cruising speed. In fact, Germany, Poland, Czechoslovakia and Italy developed modern sports aircraft specifically to meet the demands of the Challenge. Before the contest, a favourite was German Messerschmitt's BFW M.29, offering the highest performance, but due to two crashes during training, all BFWs were withdrawn. Their place as German favourites was taken by six fast Heinkel He 64s. Most numerous German aircraft was the three-seater Klemm Kl 32 (7 plus one in Swiss team). Both were wooden low-wing monoplanes. Italy and Czechoslovakia developed similar strutted low-wing monoplanes, the Breda Ba.33 and Praga BH-111. Poland developed a high-wing RWD-6 and an all-metal low-wing monoplane PZL.19. All these aircraft had enclosed crew cabins, fixed landing gear and advanced wing mechanization (flaps and slat). The other aircraft, especially French, modified from serial designs, were less modern and had lower chances in technical trials.
Aircraft participating were: Klemm Kl 32 (8), Breda Ba.33 (8), Heinkel He 64 (6), Praga BH-111 (3), PZL.19 (3), RWD-6 (2), Potez 43 (2), Farman 234 (2), Farman 250 (1), Darmstadt D-22a (1), Raab-Katzenstein RK-25/32 (1), Breda Ba.15S (1), Monocoupe 110 (1), Guerchais T.9 (1), Caudron C.278 (1), Mauboussin M.12 (1), Comte AC-12 (1).
The German aircraft had starting numbers from a range: A4-A9, B1-B9, C2-C8, E1-E2, French: K1-K8, Italian: M1-M8, Polish: O1-O6, Swiss: S1-S2, Czechoslovak: T1-T4 (numbers were placed on fuselages in a black square frame).
Read more about this topic: Challenge International De Tourisme 1932