U-19 Class.....4 tubes (2 bow, 2 stern) 6 eels
U-23 Class.....4 tubes (2 bow, 2 stern) 6 eels. SM UB-23, (2 bow) 4 eels. SM UC-23, 3 tubes (2 bow/external; one stern) 7 eels.
U-27 Class.....2 tubes (bow) 4 eels.
U-31 Class.....4 tubes (2 bow, 2 stern) 6 eels. SM UB-31, (2 bow) 4 eels. SM UC-31, 3 tubes (2 bow/external; one stern) 7 eels.
U-51 Class.....4 tubes (two bow, two stern) 9 eels. SM UB-51, 5 tubes (4 bow, 1 stern) 10 eels. SM UC-51, 3 tubes (2 bow/external; one stern) 7 eels.
U-66 Class.....5 tubes (4 bow, 1 stern) 12 eels.
U-81 Class.....6 tubes (4 bow, 2 stern) 12 eels.
U-87 Class.....6 tubes (4 bow, 2 stern) 16 eels.
U-93 Class.....6 tubes (4 bow, 2 stern) 16 eels.
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