[rel] Firing Angle Tables

geosub1978 · 12-24-08, 03:00 PM

I noticed an interest recently on manual targeting, speed calculation etc. So I desided to descirbe you my attacking tactic (almost a WW1 era one!) giving you the FIRING ANGLE tables that I have produced, resolving that related mathematic formulas.

This is how it goes:

Once you have determined the speed of the target and the distance that you will fire, you have to determine the impact angle of the torpedo on the target. This will determine your Uboot’s coarse at the moment of firing. The impact angle when attacking an unescorted target is chosen usually 90degrees. If you maneuver submerged in the middle of a convoy then you may have to choose from 0 to anything degrees. Then you pick the firing angle from the tables (for 31 or 44 torpedo) and you shoot when the target is on that bearing.

Notices:

This simulates a TDC breakdown! You do everything manually.
It works believe me, I do it for 3 years now.
Set the gyro angle to 000O and auto TDC off!
If the target passes the fire bearing or you choose to shoot earlier you can compensate with equal gyro angle but only for gyro angles up to 20O. After that the impact angle changes much and the turning cycle of the torpedo upsets the values.
If the impact angle is more than 90O, the same values are used for degrees that summed give 180O. This is the meaning of the second value in impact angle table.
Example of determining the coarse of the submarine before firing see also picture:
- Target Coarse: 330O

- Desired Impact Angle: 60O

- Submarine Coarse Before Firing = Opposite of target coarse (300O-180O=120O) – Impact Angle (60O) = 60O. So submarine coarse =060O.

So I provide in FF the tables of FIRING ANGLES for 31 and 44 kts torpedoes, related to desired Impact Angle and Target Speed.

http://files.filefront.com/FIRING+ANGLE+TABLESrar/;12758448;/fileinfo.html

You can print them or someone can make them draggable in menu_ini file.

Hoping that there is someone interested…. enjoy it!

Canovaro · 12-25-08, 03:07 AM

Interesting!
You might be interested in my torpedo bearing table though, it's based on the same attacks you make it seems.

part of my collection of documents
http://www.subsim.com/radioroom/showthread.php?t=131867

geosub1978 · 12-25-08, 05:38 PM

Yea, I see that our values are equal for the slow and fast torp speed (I have never used 40kts). However, you need a reference to impact angles other than 90deg.

Canovaro · 12-27-08, 06:59 AM

Yes you're right. I always do a 90 shot, so that's why I only made those calculations.
However yours may become useful one day

Thank you for these tables!

12-24-08, 03:00 PM	#1
geosub1978 Samurai Navy Join Date: Oct 2006 Location: Salamis Base Posts: 567 Downloads: 229 Uploads: 0	[rel] Firing Angle Tables I noticed an interest recently on manual targeting, speed calculation etc. So I desided to descirbe you my attacking tactic (almost a WW1 era one!) giving you the FIRING ANGLE tables that I have produced, resolving that related mathematic formulas. This is how it goes: Once you have determined the speed of the target and the distance that you will fire, you have to determine the impact angle of the torpedo on the target. This will determine your Uboot’s coarse at the moment of firing. The impact angle when attacking an unescorted target is chosen usually 90degrees. If you maneuver submerged in the middle of a convoy then you may have to choose from 0 to anything degrees. Then you pick the firing angle from the tables (for 31 or 44 torpedo) and you shoot when the target is on that bearing. Notices: This simulates a TDC breakdown! You do everything manually. It works believe me, I do it for 3 years now. Set the gyro angle to 000O and auto TDC off! If the target passes the fire bearing or you choose to shoot earlier you can compensate with equal gyro angle but only for gyro angles up to 20O. After that the impact angle changes much and the turning cycle of the torpedo upsets the values. If the impact angle is more than 90O, the same values are used for degrees that summed give 180O. This is the meaning of the second value in impact angle table. Example of determining the coarse of the submarine before firing see also picture: Target Coarse: 330O Desired Impact Angle: 60O Submarine Coarse Before Firing = Opposite of target coarse (300O-180O=120O) – Impact Angle (60O) = 60O. So submarine coarse =060O. So I provide in FF the tables of FIRING ANGLES for 31 and 44 kts torpedoes, related to desired Impact Angle and Target Speed. http://files.filefront.com/FIRING+ANGLE+TABLESrar/;12758448;/fileinfo.html You can print them or someone can make them draggable in menu_ini file. Hoping that there is someone interested…. enjoy it! __________________ Last edited by geosub1978; 12-24-08 at 03:22 PM.

12-25-08, 05:38 PM	#3
geosub1978 Samurai Navy Join Date: Oct 2006 Location: Salamis Base Posts: 567 Downloads: 229 Uploads: 0	Yea, I see that our values are equal for the slow and fast torp speed (I have never used 40kts). However, you need a reference to impact angles other than 90deg. __________________

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12-25-08, 03:07 AM	#2
Canovaro Ace of the Deep Join Date: Mar 2007 Location: Netherlands Posts: 1,062 Downloads: 34 Uploads: 0	Interesting! You might be interested in my torpedo bearing table though, it's based on the same attacks you make it seems. part of my collection of documents http://www.subsim.com/radioroom/showthread.php?t=131867

12-27-08, 06:59 AM	#4
Canovaro Ace of the Deep Join Date: Mar 2007 Location: Netherlands Posts: 1,062 Downloads: 34 Uploads: 0	Yes you're right. I always do a 90 shot, so that's why I only made those calculations. However yours may become useful one day Thank you for these tables!