Speedometer Precision

[Ruff EL]

Originally Posted by Armistead

I tend to agree 1 knot isn't gonna mess you up short range, but can long range, even the 3 minute rule can be off .5 knot, got to zoom in close and be precise.

With many mods, waves can effect the ships speed anyway, so it may actually vary a knot in it's speed as it travels.

Not to mention if using M14's, they often see your torp wake and with the turbo stops and starts easy to dodge one torp.....

Long range I shoot spreads.


I find the best AOB is plot his course, you can set the course on the AOB wheel and it's a perfect AOB, no drawing triangles. If you do it the stad way with accurate measurements, it will give you course and speed, just spin the wheel and set the course given on the AOB wheel..I prefer marking lines on the map

elaborate again your AoB procedure please?......are you determining their course from the compass rose tool?

[magic452]

Originally Posted by Ruff EL

elaborate again your AoB procedure please?......are you determining their course from the compass rose tool?

Use the three minute rule three times, 9 minutes. This will give you a very accurate speed, down to a quarter knot. It will also give you a very accurate target course. Remember that radar updates are every 20 seconds. Start your measurements at an update.

Use the compass rose to get that course in degrees, remember this reading.

First set speed and send to TDC.

To set AoB turn the AoB data input dial about what you guess is the Aob and send to TDC. The target ship dial on the top left side will turn.

Adjust the data input dial till the target ship dial shows the very same target course that you read off the compass rose. With the PK on that course will remain constant, if it does you have perfect AoB.


You also have very good speed +/- 0.5 knots.

You can do all this off radar readings so you have 2/3 of your firing solution and haven't seen the target yet.
If you don't have radar yet sonar will give you the same result but will take a bit more work.

With the 3D TDC you can set range to your best guess and point the scope at the target, estimate from the nav. map, and the PK will track the target for you. Radar updates will show what you need to do to get a good firing solution.

If the target stays on course and the AoB doesn't change all you need is a couple of steadimeter readings for range when the target gets closer and your all set to go.

Magic

[doulos05]

Ruff El, you're still talking about small margins of error at 8,000 yards. I'm not arguing it can't be done, but it requires the use of spreads (either longitudinal or divergent) to guarantee hits. 1 degree of angle is equal to 140 yards at 8,000 yards. There are lots of ways to accumulate 1 degree of error in your target track over 8,000 yards. 0.5 knots of speed miscalculated, slightly missing the AoB. Missing the range by just a hair. Changes in target action after the shot.

[Armistead]

Originally Posted by magic452

Use the three minute rule three times, 9 minutes. This will give you a very accurate speed, down to a quarter knot. It will also give you a very accurate target course. Remember that radar updates are every 20 seconds. Start your measurements at an update.

Use the compass rose to get that course in degrees, remember this reading.

First set speed and send to TDC.

To set AoB turn the AoB data input dial about what you guess is the Aob and send to TDC. The target ship dial on the top left side will turn.

Adjust the data input dial till the target ship dial shows the very same target course that you read off the compass rose. With the PK on that course will remain constant, if it does you have perfect AoB.


You also have very good speed +/- 0.5 knots.

You can do all this off radar readings so you have 2/3 of your firing solution and haven't seen the target yet.
If you don't have radar yet sonar will give you the same result but will take a bit more work.

With the 3D TDC you can set range to your best guess and point the scope at the target, estimate from the nav. map, and the PK will track the target for you. Radar updates will show what you need to do to get a good firing solution.

If the target stays on course and the AoB doesn't change all you need is a couple of steadimeter readings for range when the target gets closer and your all set to go.

Magic

Magic did a good job of explaining me, so I won't add much, but here are a few SS I once took.

I took about 3 stad readings {using SCAF}. Just finished the reading and asked for speed which gives you the speed of 8kts, course 60, so I accept speed and spin the AOB wheel and set it on 60. I use Easy AOB, which allows you to spin the dials freely, but you can adjust either way.



So here on the map screen I had also been plotting his course with markings, notice his course is 60 true, that matches
my stad readings perfect.



You can use stad, radar {3D radar a must} or visuals with 3 minute rule, depending if you have contacts on or off, but once you have his course, you basically have a perfect AOB. Won't add the attack SS's, but range was about 2000 yards, I shot 4,..I unlock and shoot by the wire, all hits bow to stern.

Course that goes out the window if he spots you, but if they just do the small helm zags, you still have his base course, just have to update speed and range.