Dick O'Kane
To use aft tubes for a Dick O'Kane, plot the targets couse and set up for a 90 degree shot. Don't stop the boat and continue through the plotted course until you are past it. That will give you a 180 degree shot using your aft tubes. Set up the AoB for the shot using O'Kane thery.
Using a Cromwell technique with aft tubes is another story. Rather than closing on the target, you would moving away. Set up for an intercept at 135 degrees using the aft tubes would be odd. I am not sure how to measure AoB when firing aft tubes. Anyway, lining up the shot would be on the same principles as if you were firing the forward tubes, but getting a 180 degree firing angle from the rear tubes while moving away from the target seems really strange. The point being that you want to be closing on the target, not moving away.
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