Bomber ! I am running 24 m lines on a standard naish base bar . You are correct about the extensions , 1x 3 m and 1x 4 , I did try the longest one on its own and it was simply too short , so I used them both . Maybe I have done done something wrong, I will go back and revisit it again when I get some time .

P.S I can relaunch a kite at the side if the window , but I don't understand what a reverse launch is , can anyone enlighten me ?