from hitman :
http://www.subsim.com/radioroom/newr...eply&p=1556698
It's actually very easy with the US TDC, even if you set the torpedoes to the correct zero degree Gyro Angle. Here's how to do it:
1.- Determine target course, approximately, either by eyeballing AOB (To start) or plotting (Visual or radar). Get on a course that is perpendicular or, at least, something between 45º and 90º of the enemy track (So that the torpedo has enough angel of impact and does not make a dud)
2.- Feed the TDC with all the data, and start the position keeper. Make regular corrections as you see fit, by entering new data (New estimates of speed, distance, AOB, etc, as usual)
3.- Your reference for knowing when to shoot is the Gyro Angle needle on the "own ship" dial (The lower dial in the TDC). When that needle points exactly to the bow of the ship silhouette in the dial, you must shoot the torpedo. Why? Because at that moment the necessary Gyro Angle to hit the target is zero, which is exactly the only thing your torpedo is capable of
That's more or less how the british TDC worked, only that when the GA was zero you also got an audible warning in the form of a bellring or buzz
Quote:
Originally Posted by Hitman
Here's a graphical example:
The red arrow represents the direction your bow is pointing at. A torpedo that follows the same course as you, straight from your bow, is obviously a zero Gyro Angle torpedo, and it will follow the red arrow in its course -same as your ship's course.
Then the moving needle in the dial, highlighted in green represents what Gyro Angle must your torpedo do in order to hit the target that is shown in the upper dial.
Hence, when the needle matches the red arrow, that means that the torpedo must not turn at all to hit the target, i.e. it will be a Zero GA shot, and the moment of shooting has arrived.
Is it all understandable? |