TUTORIAL VIDEO: Advanced Firing Solution using Sonar only

[sqk7744]

Moved here by request from:
http://www.subsim.com/radioroom/show...=108931&page=2

Originally Posted by Captain Krunch

"But let's pretend you don't change course. Ok, now the last bit of the puzzle is Angle on the Bow. You have two ways to use this. First, if you can determine the true course of the contact via plotting, you can input the contact's heading to determine AoB. "Sir, contact heading is plotted out to be 330 degrees!" You do not move the A, B, and Periscope dials; you move the C dial until the "0" degrees mark of the C dial is pointing to the "300" degrees mark of the B dial. When you do this, you look at the Periscope dial marker 180 degrees opposite the Periscope triangle. This marker points at "120", on the left side of the C dial ship, so this tells you that the contact AoB is 120 degrees port"
Krunch

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The following (hopefully) illustrates Capn Krunches' example:
(it appears C (Enemy Vessel) wheel's 0 points to 330 and not 300, is that correct?)

BIG Thanks to Igorry for the Clarification on the Bow oriented up (12 o’clock position) and to Hitman for pointing out that the heading was 330 and not 300.

I wanted to provide an easy, clear 3D example of how this looks for my Mates on the Forum.

Cheers!

-----------------
Visual Aids...Yes Nurse Ratchet let me have an extra hour of arts and crafts time.

And now for the Players:

First-up The USS "Onkel" Stevens


Next, "The Enemy"




[The Set-up]
1) Sub Heading: 90
2) Target heading: 330
3) Target Bearing: 300
4) Target AOB: 120

1) USS "Onkel" Stevens Heading 090 (align your heading 090 on Wheel B to 180 of wheel A)
* Note Submarine examples do not contain the C Wheel for simplicity


2) Our Target Heading 330 (Align the 0 (zero) on Wheel C to Target course 330 of Wheel B)
* Note Target examples do not contain the Transparent Periscope Wheel for simplicity


3) TARGET BEARING 300 relative Sir! (Set the inside Arrow of the transparent Periscope Layer
"highlighted in Red" to 300 on the A Wheel.)


4) AOB=120 to Port Sir (now look at The Arrow Tip of the Periscope Layer on the A Wheel)
* Note: if the C (3rd inner) wheel were included the Tip of the Periscope Arrow wheel would point to 120.
This can be seen on the Is-Was image.


And as shown on the Is-Was


[In Summary]
The Photos:
1) Our Sub's Heading: 90
2) Target heading: 330
3) Target Bearing: 300 (the inside Arrow of the transparent Periscope Layer "highlighted in Red" on the A Wheel.)
4) Target AOB = 120 Shown by the Tip of the Periscope Arrow wheel Highlighted in Red Pointing at the C Wheel

The Wheels:
A Wheel = Our Submarine
B Wheel = True Compass Heading
Transparent Wheel = The Periscope/TBD/Binoculars "bearing" to target
C Wheel = Enemy/Target ship Heading

Hope this is correct and helpful!

Enjoy

[Couldn't resist the result!]

"BOOOOOOOOM!"


Load #3 Torpedo Attack:

Here's what you should see after a minute or two into the simulation:

Subs' Heading = 000 due north and speed 0
Target heading = 102.674 (let's use 100)
Bearing to Target = 325
AOB = 45 (42 if using Target heading of 102-103)
Target speed = 9knts

* TIP: once in Map view F3 hit backspace to pause the sim. When ready, hit the NumPab + (plus) key to continue.

You can check this by drawing a line out from your sub's center with the distance tool on your course to the 8^ 13' N

Now draw another line from the target's center until it intersects your course line.

Take the Protractor and draw a line from the Intersection point to the Target's bow, now left-click and draw another line to your bow. The Angle on the Bow should = 45 degrees for AOB=45.

Please let me know if I've understood this right.

Thanks!