Welcome home skytrain and thank you 'coz I'm going to be pretty busy today!!
It is indeed the Bulgarian DAR Zdravka Sport Glider of 1926
I don't know if you've tried to make sense of the translated entry on the airwar site. I know I began to regret choosing it when it came to extract meaningful clues that would come up in a goggle search without resorting to Russian!!
skytrain10 has control 