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Originally Posted by sENoZ
i am using 28 knots torpedo and in the video range of shoot is around 4,7 km ....
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Fair enough, it didn't seem as far.
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No no you still dont got it looks like .....
so i said .....
target speed + speed of your torpedo = you have the angle of shoot nothing else + being at an angle of 90 for shoot the boat ........
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just again .... speed of target + speed of your torpedo + being at an angle of 90 degres .... = angle of shoot .................
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I thought the 90 degrees attack angle was implied. Either way, it doesn't help those numbers to fit. Ok, so let's do the numbers.
target speed 10
torpedo speed 28
10 + 28 = 38
So how does 38 shooting angle come close to the 20 you used? The only way you can make it fit together is by using a different formula.
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the angle of shoot ( shooting the torpedo ) will change depending the angle until your u-boat and the ennemy to sink.
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How does it change or depend on what?
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a video here that i did fastly, just for show you again ^^.... distance is around 4,7km cause the torpedo i use have a range of 5 km ..
give me a torpedo that can have a range of 30 kilometers, then i will do a video  ............. distance dont change anything, there is no distance will using this technic.
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Distance does not change the amout of lead, or the torpedo shooting angle if you will, but it does require your aiming to be more accuracte. As objects ar more distant they become smaller. So you need to be sure that shooting angle is exactly as much as it needs to be.
To roughly calculate the size divide the target length by the distance, and to convert it to degrees divide that by another 57. (or 60 if you want it crude) That is how much your torpedo shooting angle may vary to still hit the target. The further you shoot at, the narrower it becomes.
Nice video, but what is the target's speed? Otherwise it doesn't prove anything about your method.