Hi Hesham,

Welcome! I had a look in a book writen by Theo Wesselink and Thijs Postma and this is what they write.

Image 1, A proposal from Mr van der Eyk for an improved FK 52
Image 2, Design 1171
Image 3, A 4 person business aircraft designed by Carley
Image 4, Design 1117

That is all I can tell you, but I guess there might be people around who can tell you more.

Regards,

Mathieu.