One should always follow his intuition: Czech - Hungary but too lazy to check the main source:
His R-18 Kánya laison aircraft had won another design competition invited by the military. Two prototypes were built of this type with 105 and 160 Walter engines respectively. Due to its excellent low-speed flying capabilities this aircraft became an outstanding glider towing aeroplane and a series of 10 aircraft of the 105 HP variant were built for this purpose. At the ’50s these towing aircraft were refitted with 5 cylinder M-11 radial engines of 100 HP.