Nice observations Pisces - I was thinking about this problem too.
My question was: why is A2 smaller than A1? Your conclusions are correct at the first sight.
But if you consider the provided information of the hydro operator on the first screenshot Bojan's contact is closing.
I guess it's a rounding error - or Bojan's U-Boot was moving slowly.
Or he didn't hunt only one contact.
I'd like to know how (and at what time) Bojan checks the real AOB to compare it with his drawings.
Bojan: how do you determine your 26° AOB?
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