TDC Range Parameter Function

[Nukesub]

Ahoy Kaleun's!

I have read a few times now that the range is irrelevant in the TDC UNLESS:

Gyroangle is greater than 5 and range is close (< 1000 m)



So what exactly does the range parameter do when inputted to the TDC? How does it affect the torpedo?

Thank you for your insight shipmates!

[BigWalleye]

Originally Posted by Nukesub

Ahoy Kaleun's!

I have read a few times now that the range is irrelevant in the TDC UNLESS:

Gyroangle is greater than 5 and range is close (< 1000 m)



So what exactly does the range parameter do when inputted to the TDC? How does it affect the torpedo?

Thank you for your insight shipmates!

Easiest way to see is to change the range setting on the TVR and see how that affects the gyro angle. Gyro angle is the only settable parameter for the torpedo.

But you don't have it quite right. Range is less important under 1000m.

Without boring you with the math, range factors out of the firing equation when gyro angle at impact is zero. At zero gyro angle, lead angle (deflection) is constant regardless of range, and depends only on target speed and torpedo speed. If gyro angle is +/-5 degrees, a long enough target, like a ship, will be hit as long as the target isn't too far away.

At 500 m, a five degree angle offsets the impact point by 44 m. At 3000 m, that increases to 260 m. A good-sized freighter is 150 m long.

BTW, regardless of what the game calls it, the German TVR (Torpedo Verkehr Rechner) is not the same as the US TDC. The TVR can do things a TDC can not. And a TDC can do things the TVR can not.

[Pisces]

The torpedo tubes are a bit ahead of the periscope. Also when the torpedoes leave the tube they first move a straight section ahead, before starting the turn to the target. The furthest edge of the turn is then quite a distance away from the periscope. When they are at the far end of the turn the torpedoes see the target at a slightly different course as what the periscope is looking at. So the TDC corrects for this in the gyro angle (aside from the angle that it needs to account for the target's speed). If the gyro angle is zero (or close to it) then this correction is 0 or minimal. But if the torpedo needs to turn much more, like 90 degrees to the left/right, then this offset and the range lead to a larger correction angle. This correction angle to the gyro angle is larger the closer the target is. If the target was infinitely far away then the correction angle is pretty much 0. That's all the range dial on the TDC F6 page is needed for.

But in the notepad thingy, the range determines the target speed you get in the end of the hole procedure. Using this method it is very important in almost all situations.