From what I understand of the flight description you give, and given the size and habitat, I would suggest to have a look at woodpeckers. Dryocopus martius is large and black.
Another idea (my favourite, actually): a bird of the genus Tetrao: they can be black and large, live in the forest, and the tail widens towards the end.
Other suggestions, but I really doubt it's relevant:
- cormoran (Phalacrocorax for the size, dark color, and I've seen some perched in trees, and ther's a lake in Zürich);
- Accipiter (for the flight and habitat):
- Milvus (for the size, the tail, and the dark colour):
- cuckoo (Cuculus canorus);
- magpie (Pica pica, black, makes nests on top of high trees, but I suppose you would have recognised it without hesitation).
The yellow stripe on the back matches none of the above suggestions.
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