PDA

View Full Version : Can someone discuss in a step by step way...

thefalen
01-23-2006, 06:34 AM
A sonar attack with a sub?

pics too plz!

www.imageshack.us (http://www.imageshack.us) for hosting (free)

thefalen
01-23-2006, 06:34 AM
A sonar attack with a sub?

pics too plz!

www.imageshack.us (http://www.imageshack.us) for hosting (free)

paulhager
01-23-2006, 09:16 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by thefalen:
A sonar attack with a sub?

pics too plz!

www.imageshack.us (http://www.imageshack.us) for hosting (free) </div></BLOCKQUOTE>

I conduct some sonar-only attacks in some of the later chapters of the Altmeier Patrol Diary (http://paulhager.org/wordpress/index.php?p=75).

It's best to be stopped when you do this.

You have to select a target to ping. Once you've done that you'll discover that the initial ping is not that accurate. I found that if I did an estimate ping followed immediately by the exact ping, the latter would be reasonably accurate. Once you've gotten the distance, get a bearing from the SO. Then use the compass and ruler tools to draw a line to the target. After some time has elapsed - and it really doesn't matter how much (in other words, you don't need to use the so-called "three-minute-rule") - repeat the process exactly and note the elapsed time. Use a real stopwatch. You'll have two points on the map, a distance between them, and a time interval. Doing some simple math, you can get speed in knots. (The only advantage of the "three-minute-rule - actually the 3:15 rule - is that meters converts to knots without having to do calculation.

I'd recommend getting 3 points at one minute intervals for accuracy. If you're pinging in proximity to warships, they will come after you, particularly if seas are calm. Therefore, when warships/escorts are close ping twice. Of course, if the seas are calm, why would you make a sonar attack?

With the data in hand, the only thing that remains is to figure the course and then draw the perpindicular from it to your sub. You can obtain the angle from your "passive sonar" - that is, the hydrophone which gives you AOB. You can use all of this to program your TDC.

For my part, I like to just use my handy-dandy torpedo angle spreadsheet. When your SO tells you that the target has reached the firing angle, fire a spread of at least two torps at it. You can do 3 and get the +1 and -1 knot speed estimates to increase your chances of a hit.

I particularly recommend using FaT's for sonar-only attacks. Steam FaT's are good because they have such long range. I usually have two FaT's loaded for a spread (tubes II & III).

paulhager
01-23-2006, 12:20 PM
ADDENDUM: if you aren't fast using the tools, don't worry. What you can do is just go through the steps using your stopwatch but wait to draw the lines. You can scroll through the messages and they will contain all the information you need.