Mods for measuring horizontal angle.

stakorr · 07-30-20, 01:51 AM

Hello everyone, I'm playing SH3 with GWX 3.0 and TMT v2. I like to manually find target's AOB, distance and speed. Once I've identified the target I do the following:

For speed measurement I measure time the target needs to cross the vertical bar on my scope. Since speed is length divided by time I can obtain the speed. For distance I use the stadimeter. Finally, for the AOB I use the law of sines. Given ship's length, horizontal angle it spans and distance I can calculate the AOB. Trouble is that horizontal angle on the periscope is located at the top part of the periscope which reduces the number of dashes I can count in order to find the horizontal angle.

So, my question is: Is there a mod that has horizontal dashes placed at the center of the periscope that allows me to measure the horizontal angle or a tool that can measure the horizontal angle?

Note: For GWX on attack periscope (10 x zoom) 1 dash is about 0.149 degrees. For observational periscope (4.5 x zoom) 1 dash is about 0.227 degrees and I'm not certain about the last significant digit. Also, I played with U-jagd and I don't like it.

Cheers!

Vox165 · 07-30-20, 06:50 AM

Quote:

...For GWX on attack periscope (10x zoom) 1 dash is about 0.149 degrees. For observational periscope (6x zoom) 1 dash is about 0.227 degrees

How did you calculate that? Im playing around with The oldie WWI sim "Shells of Fury" trying to calibrate scopes etc. SOF graphics and graphing tools are crude compared to SH3/GWX, but I trying to sort something out.

Grumpy Pete · 07-30-20, 10:00 AM

I actually don't use any tools for figuring AOB. The way I do it is to imagine I am standing on the target ship looking at my submarine. The direction I have to face to see my submarine is the angle on the bow.

For my initial shot I always try to set it up for 90 degree track and 0 gyro angle for my torpedo. Let's assume that the target will crossing in front of us from left to right. Well before I am in shooting position I set my TDC by putting my scope/uzo on 0 degrees. I then set the AOB to 90 degrees starboard and lock it in (hit the button). After that--as long as I am approaching the target track at 90 degrees--which ever direction I aim will change the AOB correctly. IE--if the target is 30 degrees to port hid AOB will show as 60 degrees starboard. I then wait until my torpedo track will be 0 degrees and fire as he crosses that bearing. That bearing will be dependent on the speed of the target and my torpedo speed setting.

In the case of firing at multiple targets (a convoy) I shoot at my farthest chosen target first. That shot is usually NOT the one that will have a 0 gyro angle for my torpedo. However, if I am at 90 degrees to the course of the targets, I never have to change the AOB manually. It is already locked in. It even works when I switch my view angle to fire from the stern.

Once used to this method, it easily possible to have all your torpedos in the water before the first one hits. If a convoy is alert and zigging, I simply redice the target speed on the TDC by 1 knot to compensate for its maneuvering. If I'm within ~1200 meters that usually works although those are the shots I am most likely to miss.

IMO--the trick is to set all the angles well before it is time to shoot and then maneuver into the correct position (90 degree track). In the patrol I ran last night in my IXB I sank 11 ships by torpedo (only 1 was over 5000 tons though

). Using this method I am able to shoot at targets 3000 meters away with good success although I prefer to fire at 2000 meters or less.

Hope this helps!

stakorr · 07-30-20, 10:02 AM

Quote:

Originally Posted by Vox165

How did you calculate that?

Well, first I played around with known data. From the recognition manual one can find height of the target. Height over distance is tan of the angle you measure. Taking inverse tan of the ratio height/distance you can find the vertical angle in question. You can count dashes using the stadimeter. From there you can find the relationship between dashes and degrees. I'm guessing with the 10x zoom 1 dash is 0.15 degrees since default zoom is 1.5x when looking through the attack scope.

Aktungbby · 07-30-20, 11:32 AM

stakorr!

Vox165 · 07-30-20, 08:14 PM

Ok -sounds like your using the published heights in the manual as known and the stadimeter scale and working backwards from there. Thanks.

Pisces · 07-31-20, 08:08 AM

Pretty much any mod that has GUI in its name or description should fit your needs. So I suggest you make a search for that term. They took good care to show a calibrated vertical and horizontal scale (on the glass) in the periscope. And I don't mean the bearing ribbon at the top. They (often) provide a circular sliderule around it named the Range and AOB Finder (RAOBF) to do the measurements you mentioned. Way back I figured out some trick to make the speed calculation and zoom-corrections on it dead-simple and it is incorporated as a scratchmark on the scales in pretty much every one of them.

07-30-20, 01:51 AM	#1
stakorr Nub Join Date: Mar 2015 Posts: 2 Downloads: 9 Uploads: 0	Mods for measuring horizontal angle. Hello everyone, I'm playing SH3 with GWX 3.0 and TMT v2. I like to manually find target's AOB, distance and speed. Once I've identified the target I do the following: For speed measurement I measure time the target needs to cross the vertical bar on my scope. Since speed is length divided by time I can obtain the speed. For distance I use the stadimeter. Finally, for the AOB I use the law of sines. Given ship's length, horizontal angle it spans and distance I can calculate the AOB. Trouble is that horizontal angle on the periscope is located at the top part of the periscope which reduces the number of dashes I can count in order to find the horizontal angle. So, my question is: Is there a mod that has horizontal dashes placed at the center of the periscope that allows me to measure the horizontal angle or a tool that can measure the horizontal angle? Note: For GWX on attack periscope (10 x zoom) 1 dash is about 0.149 degrees. For observational periscope (4.5 x zoom) 1 dash is about 0.227 degrees and I'm not certain about the last significant digit. Also, I played with U-jagd and I don't like it. Cheers! Last edited by stakorr; 07-30-20 at 09:53 AM. Reason: Mistake: I wrote 6x zoom instead of 4.5x zoom.

07-30-20, 11:32 AM	#5
Aktungbby Gefallen Engel U-666 Join Date: Jul 2013 Location: On a tilted, overheated, overpopulated spinning mudball on Collision course with Andromeda Galaxy Posts: 27,818 Downloads: 22 Uploads: 0	stakorr! __________________ "Only two things are infinite; The Universe and human squirrelyness; and I'm not too sure about the Universe"

07-31-20, 08:08 AM	#7
Pisces Silent Hunter Join Date: Dec 2004 Location: AN9771 Posts: 4,892 Downloads: 300 Uploads: 0	Pretty much any mod that has GUI in its name or description should fit your needs. So I suggest you make a search for that term. They took good care to show a calibrated vertical and horizontal scale (on the glass) in the periscope. And I don't mean the bearing ribbon at the top. They (often) provide a circular sliderule around it named the Range and AOB Finder (RAOBF) to do the measurements you mentioned. Way back I figured out some trick to make the speed calculation and zoom-corrections on it dead-simple and it is incorporated as a scratchmark on the scales in pretty much every one of them. __________________ My site downloads: https://ricojansen.nl/downloads

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07-30-20, 10:00 AM	#3
Grumpy Pete Shore leave Join Date: Jun 2020 Posts: 70 Downloads: 8 Uploads: 0	I actually don't use any tools for figuring AOB. The way I do it is to imagine I am standing on the target ship looking at my submarine. The direction I have to face to see my submarine is the angle on the bow. For my initial shot I always try to set it up for 90 degree track and 0 gyro angle for my torpedo. Let's assume that the target will crossing in front of us from left to right. Well before I am in shooting position I set my TDC by putting my scope/uzo on 0 degrees. I then set the AOB to 90 degrees starboard and lock it in (hit the button). After that--as long as I am approaching the target track at 90 degrees--which ever direction I aim will change the AOB correctly. IE--if the target is 30 degrees to port hid AOB will show as 60 degrees starboard. I then wait until my torpedo track will be 0 degrees and fire as he crosses that bearing. That bearing will be dependent on the speed of the target and my torpedo speed setting. In the case of firing at multiple targets (a convoy) I shoot at my farthest chosen target first. That shot is usually NOT the one that will have a 0 gyro angle for my torpedo. However, if I am at 90 degrees to the course of the targets, I never have to change the AOB manually. It is already locked in. It even works when I switch my view angle to fire from the stern. Once used to this method, it easily possible to have all your torpedos in the water before the first one hits. If a convoy is alert and zigging, I simply redice the target speed on the TDC by 1 knot to compensate for its maneuvering. If I'm within ~1200 meters that usually works although those are the shots I am most likely to miss. IMO--the trick is to set all the angles well before it is time to shoot and then maneuver into the correct position (90 degree track). In the patrol I ran last night in my IXB I sank 11 ships by torpedo (only 1 was over 5000 tons though ). Using this method I am able to shoot at targets 3000 meters away with good success although I prefer to fire at 2000 meters or less. Hope this helps!

07-30-20, 08:14 PM	#6
Vox165 Soundman Join Date: Aug 2016 Location: Penns Woods Posts: 149 Downloads: 141 Uploads: 0	Ok -sounds like your using the published heights in the manual as known and the stadimeter scale and working backwards from there. Thanks.