Second patrol, surface attack against a Large European Oiler. Weather in windy and high waves, but otherwise clear.
80-90 degrees AOB starboard, attack at 3000 yard. Dive to periscope depth then fire 2 Mk 14 torpedoes at 30 feet deep (draft in the book is 35 feet). High speed, Influence settings.
Got two hits without a problem. No duds.
So I begin to think that something is wrong with Mark XIV dud rates : They are working way too well.