Hi Broncazonk,
>Did the D-9 have the same NASTY stall properties as the BMW 801D powered - A/F/G series aircraft?
The Fw 190D-9 had the same wing as the radial-engined variants, so it would not differ greatly in its stall behaviour.
However, the behaviour you describe - with a sharp stall and the possibility of a flick roll - is fairly typical for fighters of the era.
There were only few fighters that would behave differently - the Spitfire (carefully designed wash-out, gradual stalling wing) and the Me 109 (slats to delay the stall, fairly flick/spin resistant) come to my mind first.
There is an interesting article by David Lednicer on this topic which mentions that the Fw 190 stall behaviour was influenced by aeroelasticity effects, if I recall correctly. Look around and you'll probably find it discussed somewhere on this forum, too.
Regards,
Henning (HoHun)