Quote:
Originally Posted by derstosstrupp
It’s a very common, but mistaken, belief that I see frequently that range is only irrelevant when the track is 90°. Range is irrelevant as long as the gyro angle is zero, regardless of the approach angle. Remember, range is not a part of the calculation of pure lead angle:
Arcsin lead angle = target speed / torpedo speed * sin AOB
At different ranges, the triangle simply grows and shrinks, but the relationship of the sides remains the same, and so the lead angle remains the same.
In practice, as long as the gyro angle is within about 20° of your bow, range will pretty much not matter. This is easy to convince yourself of by simply playing with the TDC dials. For example, set the gyro angle to anywhere within 20° of your bow (by adjusting bearing), and then play with the range knob over the entire range of its throw and you will see that it hardly has any impact on the gyro angle. Now, turn the bearing until the gyro angle is large, like say 90. Now go back and play with the range again, and you will see it has a tremendous impact on gyro angle.
So in your case, when you’re making an approach, and you want to shoot at multiple ships, ideally you would point your boat such that, when you have to shoot at each one, the gyro angle is still within 20° of your bow. This makes range irrelevant as a source of error.
As a sidenote, the real S3 TDC took own course changes into account, unlike the game, which made maneuvering while firing possible. In our case, since we have to reset AOB every time we change course, it’s important to find a good attack course such that you can shoot at multiple targets without having to turn to optimize gyro angles.
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Thanks for the info and the correction the range information.
I have played around with one of the SH5 WOS tutorial missions and discovered how to fire on a ship whose track is 90 degrees to my own heading but with a non-90 AOB.
The way I did it was this:
1) Determine target track and speed. Enter Speed into Target Data Computer.
2) Position uboat on 90 degree course to target track. I don't think uboat course matters, but let's suppose you were doing a 90 degree attack on a convoy, but there was a target in the back of the convoy you wanted to hit also without waiting for it to cross your path.
3) Use the compass tool or other means to determine/estimate the Angle On Bow. Enter AOB into the TDC. Once you enter the AOB, it should update automatically as you follow the target with the periscope. You can confirm it from time to time as the target moves along its track.
4) Determine a range at which you want to fire. This will be some point in front of the target's current position. You can actually set the range to it's current position, but by the time you get back to the TDC to enter the information it will have moved. It's easier to enter a range closer than the target currently is, and then wait for the target to reach that range.
Enter that range into the TDC.
At this point the TDC has all information it needs for a firing solution. Bearing to Target, Angle on Bow, Range, and Speed.
If you turn on Torpedo Firing Solution on the map, you will see that your torpedo firing solution is quite a bit ahead of the target, as it should be.
5) When the target reaches the range you input into the TDC, fire your torpedo. If all your data was input accurately, the torpedo should intercept the target.
Naturally, impact pistols will not be very effective and steep angles like this. Naturally, you will want to use a deep run and magnetic pistol.