At low speed, the better power loading of the Fw 190D-9 should beat the P-51D easily. The P-51d could be better in the high-speed region at altitudes where it holds the speed advantage.
At low speeds the P51D will beat U (especially the likes of Shane, and other good P51D pilots). Above 20k the P51D outperforms the 190d9 in AC maneuvers. At 15-20k the Dora is really good IMHO.
I had quite a few fights at 15 - 20k with P51D's and had good results in those fights. That doesn't necessarily say everything on the aircraft performance but I found out one thing for sure. If the P51D chooses to run by diving towards the deck, I've been able to slowly catch up and finish the job. Unfortunately it takes along time to do so and that I'm exposing myself to other attacks by being on the deck chasing somebody (target-fixation gets you killed, applies very often).
On dancing a 190d9 with a p51D at 15 - 20k using vertical maneuvers, I think the 190d9 is a very good match for the p51D as long as you hold a high speed. I don't try to R&D a P51D with almost same E.
Even though the P51 can engage flaps way earlier than the 190d9 it is likely that the p51d will turn too fast into blackout (where he will lose U if U're not predictable!) and he will bleed E too doing so. The main advantage comes from high roll rate which enables you to change direction in extremely fast without loosing much E. Don't go into flat turn fights, because that is not the strongest point of the Dora and it is too predictable. In general, most of my kills don't come from getting on somebody's six but from deflection shots, which U get plenty oppertunities for in the Dora too.
The only times where I get into problems against the P51D in a Dora is when I end up in a turn fight on the deck where I can't use 3 dimensions to fight (I try to avoid low and slow fights in Dora).
[ 11-15-2001: Message edited by: Apar ]