This post is about how to assume your firing solution in advance to become to be calm and deadly assassin.
You can have very accurate manual TDC settings 15 minutes before fire, based on current situation.
You may actually be interested in one important thing about triangles in relevance of submarines (And about
TDC targetting).
Thanks to rule which says that all internal angles of triangle sums are always the same (
180), you could assume where the ship you are targeting exactly will be at
90 AoB.
As you may know, this changes rules of all TDC targeting, because with this, you can say, that if you see arriving target
from right to left at
bearing 30 with
AoB 40, you already know that it will be at
90 AoB at your current bearing
-20 (340).
So you could already turn your sub
-20 degrees and you know that you will fire your eels comfortly just ahead without any turn at their course.
This is actually huge advance, because if torpedos doesn't turn on their track, and the ship is about
90 AoB, you dont even need to set any target distance to TDC at all!!
So you could fire at 3km distant target, set 10km to TDC and you will hit him for sure. (just your clock will show irelevant time to hit).
EXPLANATION: As target with
AoB40 at
bearing30 is triangle tip with angle
40, Desired point of impact of our solution is always the same (
90), so the last angle which remains is angle at your position.
Because sum of all angles in triangle is always
180 and angle at point of impact is always
90,
only angles, which changes in time, are target's AoB and angle at your position. And because sum is always
180,
they HAVE TO changes always simultaneously, so if your target's bearing changes for
1 degree, angle at your position
does the same.
Our desired angle at impact time is
90, so we can calculate the future bearing where the target will be (for targets arriving from right to left) at that time with Target Current Bearing (
tcb) and target's current AoB (
AoB) as:
tcb - (90 - AoB).
For targets arriving from left to right its of course
tcb + (90 - AoB)
(If target is moving away, you have to relevantly changes calculation of AoB and you can find it how with your exp as you start to be comforted in this kind of targetting)
So in this situation is it:
30 - (90 - 40) = -20 = 340
You can use this rule at your own with any desired AoB at point of impact as well..
Bonus: Thanks to this you'll don't ever need to set AoB like 42 or something like that to TDC again, you can just move the periscope to bearing you calculated as your's target
AoB90 switch TDC to manual, set AoB90 into tdc, switch back to auto and you have AoB set in TDC perfectly precise.
Then you can even move periscope back to target's current position and confirm again your TDC is recalculating target's current AoB as it really is. Use RAOBF to see it currently at your peri.
This way you can set solution sometimes even 15 minutes in advance of fire and all the time between just confirm its good solution. - So you'll never go chaotic and will stay calm.
Just remember:
1) You dont need the distance if you are shooting to target with AoB90 without turns of torpedoes track
2) You dont need to have perfectly precise AoB (so you can have a little mistake in your input data, so the ship at your assumed bearing will not be really 90, but ~88 - 92), you'll see its about like this by you plain sight of ship's masts
3)
Most important - YOU ALWAYS need to have very precise speed of the ship. Thankfully to get target speed is easiest way in periscope with stopwatch, dont ever try to get this at map by calculating distances, its inaccurate and slow. And make it repeatedly if you can.
With this knowledge in your arsenal you'll become a homing missile for your hopeless prays
