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On Jan 21, 7:13*am, Stefan wrote:
Beware!!! Eric Müller himself stressed that this applies *only* to
aircraft with conventional elevator.

It's actually more limited than that. For example, airplanes with
aileron-rudder interconnects (springs/bungees, not hard links like the
Ercoupe) will make it difficult (or impossible) depending on the
design to determine which rudder is the one offering resistance (they
both will, to different and varying degrees, since the boundary layer
will have separated and the ailerons will be in the chaotic region).

These interconnects are not, to my knowledge, still being designed in,
but so much of the fleet is either old or built to old designs, so a
lot of them are out there.

Michael