Sigrun,

To expand a bit on a thought mentioned in this thread...

Static testing of propellors is an artificial condition. We generally assume the prop stalled when the model is not moving throgh the air. How quickly the airstream (i.e., model) velocity rises to a level where the prop 'flies cleanly' again is not easily determined. Perhaps a rig, such as Al Rabe used to check some of his unusual airfoils (Sea Fury article, 1970's) could allow some credible testing.

Al built a trapeze type of thing above his auto, mounted a wing section (or the model, my recall isn't perfect) and drove at approximately the model's intended flying speed. Ingenious, and ingenious methods of varying conditions for test.

Something similar, with merely a relatively clean test stand, suspended in it on links to thrust measuring scales, could be informative. A well calibrated speedometer in the vehicle would help, too.

You would benefit from cooperative support, or at least tolerance, from local traffic authorities. ...and from a dedicated friend to operate and record the measuring devices...

Worth the effort? I've seen considerable differences in most common propellors, even of same make and specifications, that such testing could become a new lifelong hobby, leaving little time to apply the findings to model flight... I fly too little to be in the Bolly, Eather, etc., prop clientele - they may be much more alike from prop to prop...