Fedor Tereshchenko, a descendant of a wealthy merchant family, became interested in the development of Dmitry Grigorovich. Tereshchenko also studied at the Kiev Polytechnic Institute and in his estate in the village of Chervonoye, Berdichevsky district, he equipped an aircraft workshop and airfield. Fyodor Tereshchenko proposed to Grigorovich to cooperate. Soon two of their sport airplanes appeared – the G-2 and the G-3. The designer and the main performer of all the works was Dmitry Grigorovich, the patron of the arts was Fyodor Tereshchenko.