SUBSIM Radio Room Forums - View Single Post - How do you calculate AOB

Fincuan · 12-12-07, 10:54 AM

Ok, here we go as promised. I'm using TMaru 1.7.2, RSRDC and a few other mods, so things might look a bit different, but they still function all the same. Because of TMaru I had to remove the damn plane from the mission, since it would start strafing me and altert the Mogami

Identify the target. In the Sub School torpedo training mission we have a nice, fat Mogami Heavy Cruiser in the sights.
First observation. Lock the ship, get the range with the stadimeter and click send to tdc ONCE(Confirmed, once is enough). Lower the scope after clicking "send to tdc".
Wait... I waited a bit over a minute. The more you wait the more precise your readings will be, but then again you don't have much time in this mission. Now is a good time to set up the torpedoes and open the tube doors.
Second observation. Again remember to click "Send to tdc" only once. Lower the scope.
Go to the speed dial and hit the "Estimate speed and course" button
Send the speed(9 knots in this case) to the tdc by clicking the "Send to tdc" button once, and note the course from the message box(101 degrees)
Go to the AOB input dial and raise the scope. Turn the wheel to what you estimate as the AOB and click the send "Send AOB to TDC" button. As you can see, I estimated the AOB to be about 78 degrees starboard. Lower the scope.
Look at the target wheel(upper left corner). That wheel shows the target as seen from our sub(the bottom wheel), and our sub is ALWAYS at the bottom. By looking at where the bow of the target(zero on the inner wheel) points on the outer wheel, we can now see what the TDC thinks as the course of the target. In this case the TDC has calculated that an AOB of 78 degrees starboard would mean that the target's course is about 82 degrees. From our two observations we, however, know that the course is really 101 degrees. Time to make some adjustments.
Still looking at the target wheel, we can see that a course of 101 degrees would require the bow of the miniature ship to point more towards our sub, meaning the AOB should be smaller than the 78 degrees I previously estimated. To achieve this, I roll the AOB wheel until the marker at the bottom shows something smaller, 50 degrees in this case, and click send to tdc.
After our re-estimated AOB the target wheel now shows the course as 110 degrees, which means that we went too low with the estimate of 50 degrees. We now need to roll the AOB wheel back a few degrees, and send it to the tdc again.
There we go! The target wheel now shows a course of 101 degrees, which is what we wanted all along. We can now enable the tdc. Note that the screenshot is actually taken after the next step.
Make one more observation, and again adjust the AOB until the target wheel points to 101 degrees. If you have map contact updates on and the periscope is up, you can easily check the quality of the solution from the attack map. As you can see, the thicker end of the small black line, which is where the TDC thinks that the target is, is almost on top of our target. When we observe it for a few seconds, we can see that it also stays there. This looks like a decent solution, so I decide to fire. I make one final observation to get the latest range and bearing, and again adjust the AOB as we have done above a few times already. Then it's time for... ROHR EINS, LOS! ROHR ZWEI, LOS! ROHR DREI, LOS! ROHR VIER, LOS!
KABOOM! Since these are early-war american torpedoes, the result was what we expected: two duds and one with a gyro problem sending it off to the right.
A final check of the attack map after the torpedoes have hit. As you can see, the TDC's marker is still almost on top of the target, which means that our solution was spot on.

A few things to remember:

Keep the scope up as briefly as possible
Click "Send to TDC" after changing anything
Remember to enable the TDC after you have all the data.
Adjust the AOB after each observation
Make one final observation right before firing

12-12-07, 10:54 AM	#25
Fincuan Admiral Join Date: Aug 2007 Location: Suomi, sauna, puukko, perkele Posts: 2,346 Downloads: 39 Uploads: 0	Das Tutorial Ok, here we go as promised. I'm using TMaru 1.7.2, RSRDC and a few other mods, so things might look a bit different, but they still function all the same. Because of TMaru I had to remove the damn plane from the mission, since it would start strafing me and altert the Mogami Identify the target. In the Sub School torpedo training mission we have a nice, fat Mogami Heavy Cruiser in the sights. First observation. Lock the ship, get the range with the stadimeter and click send to tdc ONCE(Confirmed, once is enough). Lower the scope after clicking "send to tdc". Wait... I waited a bit over a minute. The more you wait the more precise your readings will be, but then again you don't have much time in this mission. Now is a good time to set up the torpedoes and open the tube doors. Second observation. Again remember to click "Send to tdc" only once. Lower the scope. Go to the speed dial and hit the "Estimate speed and course" button Send the speed(9 knots in this case) to the tdc by clicking the "Send to tdc" button once, and note the course from the message box(101 degrees) Go to the AOB input dial and raise the scope. Turn the wheel to what you estimate as the AOB and click the send "Send AOB to TDC" button. As you can see, I estimated the AOB to be about 78 degrees starboard. Lower the scope. Look at the target wheel(upper left corner). That wheel shows the target as seen from our sub(the bottom wheel), and our sub is ALWAYS at the bottom. By looking at where the bow of the target(zero on the inner wheel) points on the outer wheel, we can now see what the TDC thinks as the course of the target. In this case the TDC has calculated that an AOB of 78 degrees starboard would mean that the target's course is about 82 degrees. From our two observations we, however, know that the course is really 101 degrees. Time to make some adjustments. Still looking at the target wheel, we can see that a course of 101 degrees would require the bow of the miniature ship to point more towards our sub, meaning the AOB should be smaller than the 78 degrees I previously estimated. To achieve this, I roll the AOB wheel until the marker at the bottom shows something smaller, 50 degrees in this case, and click send to tdc. After our re-estimated AOB the target wheel now shows the course as 110 degrees, which means that we went too low with the estimate of 50 degrees. We now need to roll the AOB wheel back a few degrees, and send it to the tdc again. There we go! The target wheel now shows a course of 101 degrees, which is what we wanted all along. We can now enable the tdc. Note that the screenshot is actually taken after the next step. Make one more observation, and again adjust the AOB until the target wheel points to 101 degrees. If you have map contact updates on and the periscope is up, you can easily check the quality of the solution from the attack map. As you can see, the thicker end of the small black line, which is where the TDC thinks that the target is, is almost on top of our target. When we observe it for a few seconds, we can see that it also stays there. This looks like a decent solution, so I decide to fire. I make one final observation to get the latest range and bearing, and again adjust the AOB as we have done above a few times already. Then it's time for... ROHR EINS, LOS! ROHR ZWEI, LOS! ROHR DREI, LOS! ROHR VIER, LOS! KABOOM! Since these are early-war american torpedoes, the result was what we expected: two duds and one with a gyro problem sending it off to the right. A final check of the attack map after the torpedoes have hit. As you can see, the TDC's marker is still almost on top of the target, which means that our solution was spot on. A few things to remember: Keep the scope up as briefly as possible Click "Send to TDC" after changing anything Remember to enable the TDC after you have all the data. Adjust the AOB after each observation Make one final observation right before firing Last edited by Fincuan; 12-12-07 at 11:08 PM.