Hi Tintrax,
You are probably correct, it was (is) your blade hanger fluttering,
not the blades themselves.
You do cover or seal in some way the balsa blades?
Speaking of blades you might find of interest a presentation on
the Model Airplane News web site, the text of it tells all.
Web>www. modelairplanenews.com "Quick and Dirty Rotary wings"
Your mention of how your Delta setting reacts raises curosity.
Would seem> when craft is level the breeze does not cone the
blades?
When held at an angle the blades cone, the conning allows the
Delta effect and thus the negative incidence required to windmill?
For Spindizzy> believe you said you have or do use Delta. Also
that you use only a single attachment to the blade hanger.
If only a single how can there be a Delta effect?
Back to Tintax> when there are several Gyronuts collaberation
is a great help, you would like more Gyro people?
There are model meets, gatherings? If one demonstrates Gyros
at such the amount of interest is surprising!
A final thought> if you should go to more powerful craft.
All full scale blade hangers are from metal.
You have the ability to work with aluminum sheet?
If so an excellent blade hanger can be assembled in one evening
and they last forever with no problems.
I produced two about 5 years ago and like a "Timex" they just
keep on ticking through all sorts of numerous disasters and of
course flights
Good luck,

Hal [email protected]