DD are a waste of time ! it would be easier if the convoys didnt have them .. On one patrol I was able to eliminate all 3 And I had the convoy all to myself . that means being above surface and not having to worry about those little tommys comming after me . I was lucky . I only used 3 torps and sunk all three . This was after 5 hours of the game . I was about 12000 meters away after it was all said and done . the convoy had 3 tankers . I like tankers for the tonnage . I dont know how to expalin the tattics od how . I would love to write them down and expalin how it was done . the importnat thing is not to allow the des to get in front of you , only if you cripple them , Than use the bow torps . I will try to make a movie on how I have done it . My utmost respect for all the seasond Kaluens Hers the link as to why I use 68 . its named after the famous 68sentai . I was the CO of virtual 68sentai for 5 years in cfs2 and Il2 .. take a look
http://68sentai.tripod.com/