It was not a prototype, that is rubbish. So if the D-11, D-12, D-13 were all prototypes, what the F was the D-9?
Well the Dora 9 was produced with around 700 built this is a fact, I have no information on any production aircraft beyond that - only that even in April 1945 the final batch of Dora 9s were handed to Jagddgeschwader 6 "Horst Wessel" with over 140 aircraft handed to them and only 4 at a time were flown into combat due to shortage of fuel since priority were given to Jets.
Gerhard Barkhorn was in charge of JG6 on April 1945, either he can't tell difference between aircraft or his standing orders were for 4 Dora 9s to be flown on Combat patrols? Why was he not given D-11s or D-13s if they were in production? why would the factories produce specifically Dora 9s on April 1945?
Perhaps he couldn't tell the difference, its a possibility as Heinz Lange, I am just trying to find information on the series not to be insulted or attacked over it, but you are offering no information to show proof they were in fact built?
Does anyone have information? I am not against the D-11 or D-13, but I have no proof they were built, this is after all a discussion board, can we not find the information together rather then just piss and argue for no reason?