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what is the track angle ? i mean which angle this dial is showing?
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The angle at which the torpedo will impact in the target. It actually is not exactly the track angle as measured in the US Navy, but the concept is the same:
FOR THE US NAVY SUBMARINES: (Taken from the torpedo fire control manual, 1950)
138. TORPEDO TRACK ANGLE:
The angle at the point of intercept between the target ships course and the reverse of the torpedo's course, measured to port or starboard of the target's bow. Symbol: TTa.
FOR THE GERMAN KRIEGSMARINE U-BOATS: (From J. Brennecke's book "U-Boots II 1943-1945: Die Gejagten")
The difference, as you can see, is that the US Navy measures the external part of the intersect angle, while the german Kriegsmarine measures the internal part. Both are however referring to the same corner of the triangle.