I maidened the Heinkel 219 today. We had cold but very calm weather (and no fog), pretty much ideal! The good thing first: it is still in one piece! The sketchiest part of the whole flight was the launch. Right after the start it pulled up almost vertically and I had some scary moments until I had the trimming done and the Heinkel back under control. After that it was behaving really nicely.
It showed no bad tendencies during the flight. I would even say that it is incredibly stable. I was trying to stall it, but even with full up elevator it was not stalling, but only sagging slightly.
Last impressions taken before the flight (you never know

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And some pictures from the maiden flight
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I also did a short video of the maiden flight
I am still wondering what caused the high amount of down trimming that was necessary to fly level. I had to use all the travel of the trimming which is about 3mm down at the trailing edge of the elevator.
When I tested the CG in flight (vertical dive without power) it was not recovering on its own but even going more negative. This is typically a sign for a CG too far back. But I was on the forward edge of the calculated CG range at 55m from the LE. Maybe I need to check again the difference of AOA between wing and horizontal stabilizer. I will do some investigations and more test flights in the next days. But for now I couldn't be happier with how the maiden went.