By the way,and as I remember,it was mentioned in AIAA,from long time ago in early 2000s.
 
Yes, French. Tested in model form at ONERA in 1948.

Odd that the text makes no mention of who 'Richard' was.

Anyone have access to any of the following?

Étude de l'Hélicoplane "Richard", Essais en Autorotation, Proces-Verbal d'Essai No. 88/S, Ch., Problem No. 59A, ONERA, Paris, janvier 1948

Étude de l'Hélicoplane "Richard", Essais en Autorotation, Proces-Verbal d'Essai No. 88/S, Ch-Annexe 1, Problem No. 59A, ONERA, Paris, mai 1948

Étude de l'Hélicoplane "Richard", Essais en Autorotation (Fin), Proces-Verbal d'Essai No. 88/S, Ch-Annexe 2, Problem No. 59A, ONERA, Paris, septembre 1948

Étude de l'Hélicoplane "Richard", Essais en Autorotation, Proces-Verbal d'Essai No. 88/S, Ch-Annexe 3, Problem No. 59A, ONERA, Paris, novembre 1948
 
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