https://ww2aircraft.net/forum/thread...4#post-1489997
pic attached to the post #263
Edit.... I have found it.. this is a Raab-Katzenstein RK 26 also known as the Fieseler F1/F2 Tigerschwalbe/Tiger. It is a German training plane. The kites were built by Īntreprinderea de Construcii Aeronautice Romānesti (ICAR).The first copy of the Acrobatic sport-training aircraft was released in 1935.