I have just rebuilt my SR Merlin after stupid mistake.
The first 20s hover test showed a bad oscillation in the tail boom at about 2Hz . I tried a few more short hover tests when the oscillation suddenly stopped. A few more tests since have not shown the problem.
Is this adaptive notch filter at work or do I heed to look further? All motors and props are balanced as good as I can get them.
You need to look further, the problem might reappear at any time because it has not really been solved.
The notch filter is not as cleaver as to single out and remove a 2hz oscillation
As everything is balanced as good as I can get it, I suspect it may be airframe harmonics matching my FC isolation system, which is suspended on tight ‘O’ rings. The system worked well in the previous build but this new one has different internal structure.
