[finchOU]

It depends.......

First off yes...Torpedo speed affects the Gyro angel which the TDC solves for.

Generally speaking the Good thing about the Fast setting is that the Torpedo takes less time to hit your target. Meaning any errors in your calculation are minimized and allows less time for your Enemy to change course or speed. The bad thing is you can't lob them from long range like you can if you use the slow setting.

Slow setting allows you more of a "stand off" capability. You can lob them from long distances and turn around and speed away on the surface before the enemy zeros in on the place where you launched from. But your calculations need to be perfect and the longer run time allows the enemy to change course.

For my personally, when attacking a convoy, I'll use slow torpedoes first and long ranged targets.....and fast torpedoes for closer targets...and try and time them to all hit about the same time to minimize the their ability to change course and speed when your first torpedo hits or is spotted in the water.