True. On Curare it enhance this plane in several ways. I know - I had a Curare that I flew very much with. And I even "enhanced" a Mach 1 with negative dihedral, anhederal,stab and it worked very good on that plane also.

Hanno Prettner said in Model Airplane News Dec 1975 issue Curare construction article "Many tests where performed to perfect this new design [anhederal] concept. It was found that the airfoil was very critical of the stabilizer otherwise opposite results where obtained."
The advantages mentioned,optimum low and high speed performance:
- Landing performance was improved
- Even bigger advantage in figure M since oscillation after stall turn was eliminated
- Rolls was improved (much better then the Super Sicroly)
- Improved crosswind performance and smoothness in gusty winds

/Bo