even if you shoot down an airplane you will almost always suffer heavy damage or casualties.
in the stock game, gun crews were almost invincible to gunfire. fact is there is little protection for an AA gunner or deck gunner on a u-boat.
so, GWX scaled the AA gunner invincibility way down to virtually nothing.
this coincides with history as most u-boat sinkings were credited to aircraft.
remember - tracers go both ways!
and the machine guns on aircraft range from 30 caliber up to and occasionally beyond 20 mm. - thats a little bit smaller than a golf ball
even with a U-Flak tower... chances are - coming away clean are very slim, especially late war when air to surface rockets start showing up.
the rockets are fast as hell - and they pack enough punch to destroy entire compartments with a single hit. and most planes equipped with them begin to travel in packs of two.
you wont see many aircraft up until about 1943... after that you will probably see more planes than ships.
U-boats are NOT anti-aircraft platforms... and should not be used as such. its very hard to hit a fast moving airborne target from a pitching and rolling U-Boat tower.
always crash dive.
