The J-1B was one of those home built planes growing up that seemed to be very realistic to build. I’ve always been a fan of this plane, I think more RC models exist of this plane then the real thing.
The design was from the early 70’s & Poland
The simple but classic lines of this airplane still look good to me today.
& an interesting web pages full of pictures
In the mid 90’s I got a Plan for a RC 52″ span electric version from RCM, they went belly up years ago, Fortunately the Outerzone project in England has gathered RC plans that are no longer available where you can get a free pdf & building info.