...with the "Buran" you almost cought me:
http://en.wikipedia.org/wiki/Buran_(spacecraft)
http://www.youtube.com/watch?v=Q6WHjQ3Y3Uo&feature=fvwrel
PS: If your "secret" works for other Copters as well, you will have a lot of new friends.....come on, give us more details
Siim - nice one) really hard to find it here in such a shiny condition.. would you like to sell it?