On Jan 5, 4:44*pm, wrote:
Here's a reference to complement the DG video and also a discussion of
changes in certification requirements w.r.t. flutter. An interesting
read.

http://www.dg-flugzeugbau.de/dg1000-flattern-e.html

Some of the wording is a bit ambiguous, but the way I read it there
are two conclusions that are relevant to this discussion:

1) Holding on to the stick tends to damp out one mode of wing flutter
(and perhaps other controls too). It is a mode that is exacerbated by
the fact that when the wing flexes up an unbalanced aileron will tend
to deflect downward and vice versa.

2) Adding water ballast can decrease the flutter speed. If I read it
right the DG-300 had it's Vne reduced due to the test depicted in the
video.

9B

I'm reaching way back here but I remember flight test aircraft
equipped with dampers in the control system, similar to small shock
absorbers. The dampers would stiffen up if a control surface started
to flutter. The idea was to let the test pilot note the airspeed at
onset of flutter without letting it become destructive. The controls
felt like they were in molasses but the aircraft was still flyable for
the purposes of the test.

That might still be a workable strategy for those pushing the envelope.