Be cautious when downloading ".rar" files from untrusted sources, as they can sometimes contain malware rather than the expected model plans.
1 A3 page with construction descriptions (typically in Polish). Designed by Tadeusz Grzelczak. Download Fly Model 039 Polikarpow rar
Available from retailers like eBay or specialized hobby shops like Super-Hobby , which lists similar Polikarpov models. Be cautious when downloading "