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.

The Wiki: https://en.wikipedia.org/wiki/Janowski_Don_Kichot

& an interesting web pages full of pictures

https://www.gonzoaviation.com/clanok/prvy-aeroplan-mariana-barusa-j-1b-om-txb

http://www.angelfire.com/ks2/janowski/

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.

1995 plan: https://outerzone.co.uk/plan_details.asp?ID=6971

1985 plan: https://outerzone.co.uk/plan_details.asp?ID=6811

X plane sim allows you to purchase individual aircraft, the J-1B is one of these options.

https://store.x-plane.org/Janowski-J-1B-Don-Quixote_p_1240.html