Hi Nikos,
Please try it again in the Forum for the
DF-22-E and don't hesitate to ask your questions in english. You will get more hits there for sure.
But also keep in mind: the more german sentences you provide the more answers you will get. But I'm quite sure both will be ok so far.
One little hint for your success in communicating the problems: try to use some images. You know, an image says way more than a billion words.
Enhance your picture with some simple arrows and everyone will know much better what you mean.
However, it's late now and I'm not an expert to the dragonfly helicopters. So let's wait until tomorrow and see what will raise here.
cheers
Jack
BTW: your german ist quite good so far, it is the problem itselv where I'm too unexperienced to help you. So there's no reason to apologize.