patpatballball8888*

I can't remember that it was crash, at least not a big one. But maybe that could be it. Would the helicopter behave like it's doing if it is the 4in1 thats broken?

Radlo13*

You mean i put the front engine at the back and the back engine in the front? I don't think so because I bought the back engine first and replaced the old one before I bought the front one. But I will try that anyway in case the packings were marked wrong.