how do you do "angle on bow"

JMV · 11-12-08, 01:14 PM

nubse · 11-02-09, 02:12 AM

I've figured out a way to calculate the AoB (at least I think so) but you need to know the targets course. Here's an example:

Your course is 21 degrees
Your target is in your scope bearing 25 (that's at 46 degrees)
Your targets course is 245 degrees

Roughly you're heading NNE (between 0 and 90 degrees) while your target is heading WSW (between 180 and 270 degrees)

The Angle-on-Bow is a simple mathematical solution. You already have one angle, 25 degrees, which is the angularoffset of your periscope in relation to your course.

Since the AoB can not be more than 180 degrees and the angular sum of a triangle is 180 degrees, you can subtract 25 from 180, leaving you with 155 degrees left for the two other angles.

Because that we already have both the sub-course and the target-course, we can calculate the 2nd angle by adding to 90 degrees, the target-course offset from 270 degrees and the sub-course offset from 0 degrees, which is 90 + 25 + 21 degrees, so our 2nd angle is 136 degrees.

This leaves us with these results
Angle 1: 25 degrees (our periscope offset relative to our course)
Angle 2: 136
Angle 3 (AoB) = 180 - 25 -136 = 19 degrees. Jeez :p

Maybe a little more work can reduce the complexity of these reductions... other, maybe larger, triangles and compass-quadrants: A for Sub & B for Target: in my example, A is I & B is III and vice versa.

Sonoboy · 11-02-09, 11:51 AM

nubse, the issue with estimating AoB is that you don't know the target's course. If you do know the target's course, there is no problem at all with getting the AoB.

So far, I have used the recognition book to help me estimate the AoB with pretty accurate results. Look for certain features on the superstructure that will help you out. Also, if you're having difficulty, wait until the AoB more closely matches the next higher angle in the recognition book before making your estimate. All this is assuming that you're in front of your target.

11-02-09, 10:42 PM

Quote:

Originally Posted by nubse

I've figured out a way to calculate the AoB (at least I think so) but you need to know the targets course. Here's an example:

Your course is 21 degrees
Your target is in your scope bearing 25 (that's at 46 degrees)
Your targets course is 245 degrees

Roughly you're heading NNE (between 0 and 90 degrees) while your target is heading WSW (between 180 and 270 degrees)

The Angle-on-Bow is a simple mathematical solution. You already have one angle, 25 degrees, which is the angularoffset of your periscope in relation to your course.

Since the AoB can not be more than 180 degrees and the angular sum of a triangle is 180 degrees, you can subtract 25 from 180, leaving you with 155 degrees left for the two other angles.

Because that we already have both the sub-course and the target-course, we can calculate the 2nd angle by adding to 90 degrees, the target-course offset from 270 degrees and the sub-course offset from 0 degrees, which is 90 + 25 + 21 degrees, so our 2nd angle is 136 degrees.

This leaves us with these results
Angle 1: 25 degrees (our periscope offset relative to our course)
Angle 2: 136
Angle 3 (AoB) = 180 - 25 -136 = 19 degrees. Jeez :p

Maybe a little more work can reduce the complexity of these reductions... other, maybe larger, triangles and compass-quadrants: A for Sub & B for Target: in my example, A is I & B is III and vice versa.

You got it. Get his course and speed. Figure out your approach and solution Mathamaticaly. Gather as much information as possible on the surface, and mathamaticaly.

Super simplified example:
Target Course: 000
Target Speed: 7 Knots

Wanna make a bow shot, from his 090? Simple.
Set the UZO at 000.
Go to the TDC (not the notepad).
Bearing: 000 is already entered by the UZO.
AOB: 090 Starboard.
Speed: 7 Knots.
Range: 1.000 Meters.

Now you've got to maneuver to make the shot.
Your course should be 270.
Point your UZO or Periscope until the Gyro Angle reads 000.
When he reaches that point, let him have it.
The closer the range, the more neutralized are any small errors.
Although 800 meters is optimum.

Onkel Neal · 11-02-09, 10:49 PM

Quote:

Originally Posted by nubse

I've figured out a way to calculate the AoB (at least I think so) but you need to know the targets course. Here's an example:

.

Welcome aboard the forum, mate.

Neal
SUBSIM

nubse · 11-04-09, 02:35 PM

Here's the example I've used. If you print the picture and measure the angles, it should fit my calculations.

nodlew · 01-22-10, 11:02 AM

Jason, your explanation of how to use the AOB tool on the TDC--using it to input the target's course to establish AOB has completely changed the game for me. Thank you very much.

psykopatsak · 01-22-10, 07:31 PM

the OLC mod has a wonder-ring that you just click on, and then you just drag a little here and drag a little there and voila!

nodlew · 01-22-10, 07:50 PM

Yeah, I use the OLC AOB finder in SH3 and a nearly identical device for SH4 UBM for the U-Boots, but I was spraying torpedoes all over the place in SH4 in the Fleet Boats. Speed was a snap--course was a snap, but my AOB guesses were wildly inaccurate. Jason's post explains how to use the TDC to find course and speed, which provides AOB after the target's course has been input into the TDC. This is an SH3 thread, but I'll take the info where I find it. On second patrol now--I've seen nothing but fishing boats in over two months of patrols, but when I find 'em, they're gonna get, and get it good.

11-02-09, 02:12 AM	#2
nubse Nub Join Date: Nov 2009 Location: Denmark Posts: 4 Downloads: 50 Uploads: 0	AoB calculation I've figured out a way to calculate the AoB (at least I think so) but you need to know the targets course. Here's an example: Your course is 21 degrees Your target is in your scope bearing 25 (that's at 46 degrees) Your targets course is 245 degrees Roughly you're heading NNE (between 0 and 90 degrees) while your target is heading WSW (between 180 and 270 degrees) The Angle-on-Bow is a simple mathematical solution. You already have one angle, 25 degrees, which is the angularoffset of your periscope in relation to your course. Since the AoB can not be more than 180 degrees and the angular sum of a triangle is 180 degrees, you can subtract 25 from 180, leaving you with 155 degrees left for the two other angles. Because that we already have both the sub-course and the target-course, we can calculate the 2nd angle by adding to 90 degrees, the target-course offset from 270 degrees and the sub-course offset from 0 degrees, which is 90 + 25 + 21 degrees, so our 2nd angle is 136 degrees. This leaves us with these results Angle 1: 25 degrees (our periscope offset relative to our course) Angle 2: 136 Angle 3 (AoB) = 180 - 25 -136 = 19 degrees. Jeez :p Maybe a little more work can reduce the complexity of these reductions... other, maybe larger, triangles and compass-quadrants: A for Sub & B for Target: in my example, A is I & B is III and vice versa. Last edited by nubse; 11-02-09 at 04:50 AM.

11-04-09, 02:35 PM	#6
nubse Nub Join Date: Nov 2009 Location: Denmark Posts: 4 Downloads: 50 Uploads: 0	AoB calculation Here's the example I've used. If you print the picture and measure the angles, it should fit my calculations. Last edited by nubse; 11-04-09 at 02:47 PM.

01-22-10, 11:02 AM	#7
nodlew Engineer Join Date: Dec 2009 Location: Virginia Posts: 202 Downloads: 572 Uploads: 0	Jason--thank you! Jason, your explanation of how to use the AOB tool on the TDC--using it to input the target's course to establish AOB has completely changed the game for me. Thank you very much.

11-12-08, 01:14 PM	#1
JMV Sonar Guy Join Date: Jun 2008 Location: Galway-IRELAND Posts: 397 Downloads: 179 Uploads: 0	Gruss Gott Capt.Kronos und wilkommen A good little bunch for you mate : :p http://www.subsim.com/radioroom/showthread.php?t=113866 http://www.subsim.com/radioroom/showthread.php?t=110273 http://www.subsim.com/radioroom/showthread.php?t=137198 http://www.subsim.com/radioroom/showthread.php?t=104536 http://www.subsim.com/radioroom/showthread.php?t=90303 http://www.subsim.com/radioroom/show...anual+plotting http://www.subsim.com/radioroom/showthread.php?t=123699 http://forums.ubi.com/eve/forums?a=t...3&m=4241041052 http://www.subsim.com/radioroom/show...light=tutorial http://www.subsim.com/radioroom/showthread.php?t=110770 http://www.subsim.com/radioroom/showthread.php?t=131188 JMV.

11-02-09, 11:51 AM	#3
Sonoboy Planesman Join Date: Aug 2005 Location: United States, CA Posts: 195 Downloads: 9 Uploads: 0	nubse, the issue with estimating AoB is that you don't know the target's course. If you do know the target's course, there is no problem at all with getting the AoB. So far, I have used the recognition book to help me estimate the AoB with pretty accurate results. Look for certain features on the superstructure that will help you out. Also, if you're having difficulty, wait until the AoB more closely matches the next higher angle in the recognition book before making your estimate. All this is assuming that you're in front of your target.

01-22-10, 07:31 PM	#8
psykopatsak Medic Join Date: Oct 2009 Location: Grid AO27 Posts: 161 Downloads: 27 Uploads: 0	the OLC mod has a wonder-ring that you just click on, and then you just drag a little here and drag a little there and voila!

01-22-10, 07:50 PM	#9
nodlew Engineer Join Date: Dec 2009 Location: Virginia Posts: 202 Downloads: 572 Uploads: 0	Yeah, I use the OLC AOB finder in SH3 and a nearly identical device for SH4 UBM for the U-Boots, but I was spraying torpedoes all over the place in SH4 in the Fleet Boats. Speed was a snap--course was a snap, but my AOB guesses were wildly inaccurate. Jason's post explains how to use the TDC to find course and speed, which provides AOB after the target's course has been input into the TDC. This is an SH3 thread, but I'll take the info where I find it. On second patrol now--I've seen nothing but fishing boats in over two months of patrols, but when I find 'em, they're gonna get, and get it good.