flyer it is from local plan
Originally it was printed by Modelar (local magazine on old days)
Now are avalible as reprints from RCRevue
http://www.rcrevue.cz/objednejte-si/planky-modelar/
Some more details:
Wig span 1776mm Weight 3250g (my will be 3000g max)
The original engine is MVVS with rear intake carburator and the servos are from Multilex push/pull