Looking at this photo of the A400M, it would appear that props 1 & 4 are supra-convergent (as one would expect to minimise P-factor) but that 2 & 3 are supra-divergent.
http://www.flightglobal.com/airspace...eglo-marks.jpg
Why has it been designed like this? There is presumably a substantial advantage of making the centre props supra-divergent, otherwise one would expect all props to be supra-convergent to minimise P-factor.
If the aircraft had a low tailplane I would hasard a guess that it would help reduce tailplane drag at some flight regimes, but surely the high T-tail is not affected by prop upwash from the middle engines?
Or is it to reduce the total prop downwash over the wing to reduce dihedral effect?