Hi Davor,
yes the google translator is a really funny thing
But you seem to be quite familiar with English so we at least here can go ahead beside googles "help".
I can remember, that it's not that easy to find the price for the TDR on Jans HP.
You can't find and buy it in his shop system, so you need to send an eMail to get a place on the waitlist.
The TDR first release in 09 came with a price of 888,- € for the naked mechanics. The first testings on a wide customer range with the first 300 Helis came to the result, that there are some points to enhance the TDR in Jans opinion.
So first he developed a counter bearing for the proposed Kontronik pyro engine, which is build around a rather weak 6mm shaft.
The second release of the TDR this year got a new head, which is a little more complicated and was supposed to avoid shaking of the Heli on low RPMs.
In addition Jan changed the gears and some other details for the tailrotor to higher quality combinations, which allows now to run more than 2000 RPMs without any problems at the tail. It also reduces the noise level to an absolute whistler.
All these things (the counter bearing now is part of the kit) increased the price to a still very compatitive 980,- €.
The delivery time is something around 6-9 month or you try to catch a used one on EBAY or the private sells of the different communities. In most of those cases the seller determines the prices on rather ridiculous levels, because of the long waiting list. So be carefull then.
The spare parts should reach Serbia in a reasonable time (There are TDRs all over the world)
Your question regarding the engine: You could buy a Kontronik, but these engines are underdogs compared to some of the scorpions regarding mechanical rigidity and power. To keep it more simple: A comparable factory Scorpion is about 100,- € less in price. If you spend the necessary money for a pyro on a special Scorpion (for instance the already sold out 4525 520 LE ) you have a lot superior engine compared to any other available Pyro (if you don't mention the black edition pyros on it's unbelievable price
).
Regards
Ingo