Not quite sure about the fin either – Etrich Taube certainly has no fin whatsoever.
But does have horizontal stabilizer.
Now, what is the use of the horizontal stabilizer? Concorde does without.
The use is stabilizing the plane against pitching.
The angle of attack must decrease backwards. Accordingly, a tailplane must have smaller angle of attack than main wing, whereas a canard must have bigger angle of attack.
When a plane with tailplane pitches up so far as to stall the main wing, the wing falls – but the tailplane at lower angle of attack is as yet unstalled, keeps the tail up and therefore drops nose, releasing the main wing from stall;
when a plane with canards pitches up, the canard having higher angle of attack stalls first, drops nose and thus prevents main wing from stalling.
So either way the stabilizer prevents sustained stalls – and also changes of pitch short of stall.
Then how does Concorde fly without any horizontal stabilizer at all?
Note how big the wing chord is.
You can move the tailplane closer to main wing and still keep the plane stable – if the tailplane is made bigger on account of the smaller leverage.
Accordingly, a plane with big chord could completely merge the stabilizer into the trailing edge of the main wing.
With some obvious disadvantages.
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