Just got back from the Spring Rhinebeck Fun Fly. I got in three flights with my D7, until my solder joints failed again. Talking with the other flyers I got different feedback. First, has anyone heard of a chronic vibration problem with the DL 50? I have problems with the solder joints on the wing struts. The machine guns also are taking a beating (mounts breaking etc). I was thinking about some sort of vibration mount for the engine