ORIGINAL: dick Hanson

antslake - that is incorrect .
Have you flown these?
Or are you just guessing?
These do not drag around at a high AOA- they fly very flat -even at very low speeds -
the wingloading is under 5 oz ft.
They do sink rapidly at min speed -but are completely controllable .
The "rules for planes " concept is fine for very basic trainers .
With the power available - even on full scale - the old rules have evolved - a lot.
What is an Ospry? a plane - a helicopter?
The thin flat plate as a lifting device is excellent -as long as the AOA is controlled.
As an aerobat - when pitched quickly, it has the excellent property of instantly stalling and snapping - then easily, quickly recovering due to very low inertia.
For you - that may be a terrible thing - for me -it is exactly what I want!
If my hypotheticals are useless to you - ignore them .
However - unless you research the capability of a concept - to infinity or to zero - you really have not thoroughly explored it.
If the basic textbook approach make you more comfortable - stick with it.