duds, duds and more duds

[I'm goin' down]

New campaign in TMO2 + RSRDC. I decided to venture into Tokyo Bay on the first mission (begining on 12/7/41).
1. First merchant - O'Kane method, forward tubes. 3 duds and 1 miss with the wire at 350 degrees, and 2 missed with the wire, etc. reset to 20 degreses.
2, Second merchant - O'Kane method using aft tubes with the wire set at 190 degrees. 1 dud and 1 contact, sinking a Biyu Maru.
3. Third merchant - some sort of tanker. Modified O'Kane using aft tubes with the wire at 0 degrees. 1 dud and my crew did not announce the second contact, so I assume it was a miss and not a dud.
4. Fourth merchant - Yokohama port. Stationary target. 2 contacts, but it did not sink.
5. Fifth merchant - Yokohama port. Stationary target. 2 duds.
6. Sixth merchant - Yokohama port. Stationary target. 2 duds. Sank it with the deck gun.
7. Returned to fifth merchant: Fired two more torpedoes. 2 duds. Sank it with the deck gun.
8. Returned to fourth merchant: Fired two more torpedoes. 2 duds. Ran out of ammunition for the deck gun, and it did not sink.

SUMMARY
Merchants sunk: 3
Torpedoes fired: 20
Total torpedo contacts: 16
Total explosions: 3
Total duds: 13
Total misses: 4
Merchant sunk by torpedoes: 1
Merhant damaged by torpedoes and deck gun: 1
Merchants sunk by deck gun: 2

Torpedo failure rate: Between 65% (13 duds/20 torpedoes, and this assumes the 4 missed shots were not duds) and 81.25% (13 duds/16 torpedeos, and this does not count the 4 missed shots)

All new skippers, there is a lesson to be learned here.