when to fire torp

scorpiondown · 09-27-11, 12:23 PM

the optimal time to shoot is 90 degrees and 800 meters from target,correct?(probably is rare to get that set-up)
where should the target be in relation to the sub when the torpedoes are fired?? when it is at the 90 degrees or before??.. say the target is at 100 degrees moving to the left..do you wait till it is at 90 ..i,m still trying to figure out where you can plot the estimated point of contact between the target and the torpedo...

is there some reference to the torpedo speed and distance??i know there are variables like the angle..anyone kinda understand what i,m trying to say??
Thanks

DelphiUniverse · 09-27-11, 12:51 PM

I would think that the solution is optimal when the torpedo and the target are perpendicular, in a T-shape.

or if the torpedo is travelling a straight line straight ahead of your uboat and will hit it when the target is straight ahead.

scorpiondown · 09-27-11, 05:54 PM

i was thinking about that...but then the torpedo won,t hit at a 90 degree angle as the ship would have moved some..the torpedo would have to turn a little... how do you time it so the torpedo does hit exactly when the ship is at a 90 from the sub? how far ahead do you fire before the ship gets to the exact location?? I,m just using 90 degrees as a reference here..gonna have to watch all those great you tube tutorials some more...

DelphiUniverse · 09-27-11, 06:12 PM

I have never actually tried to perform an exact T-shape attack, I usually send away my fish when the target is at some comfortable angle that I know it will hit more or less at 90 degrees.

If you are at 800 metres, you don't have to do this, it is so close that the time spent doing that is a waste.

If you are at 3000 or 4000 metres, it will become more relevant to try to make a T-shape attack. When you have plotted the target ship's course and measured its speed, you can plot a point on the line when to fire when the ship will be straight ahead, by using the ship's speed and the torpedo speed setting.

The calculation is straight forward, what method to use is unknown to me, there is probably a method to do it easily, I don't know any at this moment.

If you are using the Steinbarsch torpedo with a speed setting of 45 knots and the ship is travelling at half of that speed at 22.5 knots, then you need to fire the torpedo when the ship is half the distance between the middle point and your uboat's distance to the middle point. If your uboat is at 4000 metres then you need to fire when the target is 2000 metres from the middle point.

Target Speed / Torpedo Speed * Uboat-distance-to-middle-point

If your uboat is 8000 metres away from the crossing intersection of the target, the torpedo speed is 45 knots and the target ship is travelling at 10 knots, then the calculation becomes:

10 / 45 * 8000 = 1777,7 metres. When the target is 1777 metres from the center point you should fire. (This works only if the torpedo course and target course are perpendicular at impact time)

RickC Sniper · 09-27-11, 06:16 PM

It depends on torpedo speed and target speed. Distance does not matter.

A good discussion of this here:
http://www.subsim.com/radioroom/show...Fast+90+method

For a chart showing you EXACTLY where to point your scope and fire so your torpedo goes the exact direction as your sub's heading and hits the target when it intersects that path download this document collection. The chart you want is called the "Torpedo bearing table".

http://www.subsim.com/radioroom/down...o=file&id=1487

Extract the zip and go to:
Carnovaro's Document Collection\sheets\Torpedo bearing table

But a pretty good rule of thumb is 10 degrees. Fire when the ship is at 350 degrees or at 10 degrees.

scorpiondown · 09-27-11, 07:20 PM

thanks for the help and info!!!!

That torpedo bearing table is what i was looking for..Thanks!!!

RickC Sniper · 09-27-11, 07:59 PM

You are welcome. I find that if I'm patient I can get into position ahead of merchants and use this setup more often than not. At 1000 yards and an accurate speed of target, you can pretty much pick the rivet you want to hit on the target and nail it.

Remember to open tubes first or you hit late.

Good Hunting!

09-27-11, 12:23 PM	#1
scorpiondown Electrician's Mate Join Date: Feb 2009 Location: near Pittsburgh pa. and Daytona Posts: 131 Downloads: 107 Uploads: 0	when to fire torp the optimal time to shoot is 90 degrees and 800 meters from target,correct?(probably is rare to get that set-up) where should the target be in relation to the sub when the torpedoes are fired?? when it is at the 90 degrees or before??.. say the target is at 100 degrees moving to the left..do you wait till it is at 90 ..i,m still trying to figure out where you can plot the estimated point of contact between the target and the torpedo... is there some reference to the torpedo speed and distance??i know there are variables like the angle..anyone kinda understand what i,m trying to say?? Thanks

09-27-11, 06:12 PM	#4
DelphiUniverse 中国水兵 Join Date: Mar 2010 Location: Scapa Flow, underneath a ferry Posts: 272 Downloads: 125 Uploads: 0	I have never actually tried to perform an exact T-shape attack, I usually send away my fish when the target is at some comfortable angle that I know it will hit more or less at 90 degrees. If you are at 800 metres, you don't have to do this, it is so close that the time spent doing that is a waste. If you are at 3000 or 4000 metres, it will become more relevant to try to make a T-shape attack. When you have plotted the target ship's course and measured its speed, you can plot a point on the line when to fire when the ship will be straight ahead, by using the ship's speed and the torpedo speed setting. The calculation is straight forward, what method to use is unknown to me, there is probably a method to do it easily, I don't know any at this moment. If you are using the Steinbarsch torpedo with a speed setting of 45 knots and the ship is travelling at half of that speed at 22.5 knots, then you need to fire the torpedo when the ship is half the distance between the middle point and your uboat's distance to the middle point. If your uboat is at 4000 metres then you need to fire when the target is 2000 metres from the middle point. Target Speed / Torpedo Speed * Uboat-distance-to-middle-point If your uboat is 8000 metres away from the crossing intersection of the target, the torpedo speed is 45 knots and the target ship is travelling at 10 knots, then the calculation becomes: 10 / 45 * 8000 = 1777,7 metres. When the target is 1777 metres from the center point you should fire. (This works only if the torpedo course and target course are perpendicular at impact time) Last edited by DelphiUniverse; 09-27-11 at 06:34 PM.

09-27-11, 06:16 PM	#5
RickC Sniper Undetectable Join Date: Sep 1999 Location: Colorado Posts: 1,221 Downloads: 132 Uploads: 0	It depends on torpedo speed and target speed. Distance does not matter. A good discussion of this here: http://www.subsim.com/radioroom/show...Fast+90+method For a chart showing you EXACTLY where to point your scope and fire so your torpedo goes the exact direction as your sub's heading and hits the target when it intersects that path download this document collection. The chart you want is called the "Torpedo bearing table". http://www.subsim.com/radioroom/down...o=file&id=1487 Extract the zip and go to: Carnovaro's Document Collection\sheets\Torpedo bearing table But a pretty good rule of thumb is 10 degrees. Fire when the ship is at 350 degrees or at 10 degrees. __________________ Support Subsim http://www.subsim.com/store.html

09-27-11, 07:20 PM	#6
scorpiondown Electrician's Mate Join Date: Feb 2009 Location: near Pittsburgh pa. and Daytona Posts: 131 Downloads: 107 Uploads: 0	thanks for the help and info!!!! That torpedo bearing table is what i was looking for..Thanks!!! Last edited by scorpiondown; 09-27-11 at 07:35 PM.

09-27-11, 07:59 PM	#7
RickC Sniper Undetectable Join Date: Sep 1999 Location: Colorado Posts: 1,221 Downloads: 132 Uploads: 0	You are welcome. I find that if I'm patient I can get into position ahead of merchants and use this setup more often than not. At 1000 yards and an accurate speed of target, you can pretty much pick the rivet you want to hit on the target and nail it. Remember to open tubes first or you hit late. Good Hunting! __________________ Support Subsim http://www.subsim.com/store.html

09-27-11, 12:51 PM	#2
DelphiUniverse 中国水兵 Join Date: Mar 2010 Location: Scapa Flow, underneath a ferry Posts: 272 Downloads: 125 Uploads: 0	I would think that the solution is optimal when the torpedo and the target are perpendicular, in a T-shape. or if the torpedo is travelling a straight line straight ahead of your uboat and will hit it when the target is straight ahead.

09-27-11, 05:54 PM	#3
scorpiondown Electrician's Mate Join Date: Feb 2009 Location: near Pittsburgh pa. and Daytona Posts: 131 Downloads: 107 Uploads: 0	i was thinking about that...but then the torpedo won,t hit at a 90 degree angle as the ship would have moved some..the torpedo would have to turn a little... how do you time it so the torpedo does hit exactly when the ship is at a 90 from the sub? how far ahead do you fire before the ship gets to the exact location?? I,m just using 90 degrees as a reference here..gonna have to watch all those great you tube tutorials some more...