I'm using this pattern:-
http://www.sphere.bc.ca/test/build/yokota-loglog.pdf
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Originally Posted by Puster Bill
Here is how it works:
You take observation 1, say, 7300 yards at bearing 220
Then, a few minutes later, observation 2, 6100 yards at bearing 213.
Subtract 213 from 220, giving 7 degrees.
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that makes sense.
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Originally Posted by Puster Bill
Fiddle with the S scale on the slide against the A scale until the distance between 6100 and 7300 on the A scale matches 7 degrees. In this case, it comes to about 52 degrees matching with 6100 (actually, 6.1 on the scale). That is the AOB at the second observation.
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you say the distance between 6100 and 7300, do you mean 1200? (1.2 on the A scale)
where do you get the 52 degrees from? If i line up 7 on S with 6.1 on A i can find ~52 on the T2 scale. If i line 7 on S with 1.2 on A then i can't see anything like 52 (or even 5.2) lined up with 6.1
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Originally Posted by Puster Bill
Without moving the slide, move the cursor along the S scale down to the 7 degree mark on the S scale. This will give the distance traveled on the A scale, in this case about 1,480 yards (it will actually read 1.48).
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Now you've lost me totally. I haven't moved the slide (as requested) so as far as i can see, 7 on S still lines up with 6.1 on A. Where do i get the 1.48 from.
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Originally Posted by Puster Bill
Now, you remembered to time the observations, right? If you are using a variant of the 3 minute 15 second rule, you are golden, as you can convert directly to knots.
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14.8 knots in this case?
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Originally Posted by Puster Bill
However, if you had to go take a dump or whatever between observations, and couldn't do it exactly, don't sweat it.
Lets say that you had to wait for 4 minutes, or 240 seconds, between observations. Align the distance, 1,480 yards on the A scale (again, actually 1.48) with the time in seconds on the B scale (actually, 2.4). We then read the speed in yards per second on the B scale under the 1's on the A scale, in this case 16.2 YPS (actually, it will read 1.62).
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gotcha
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Originally Posted by Puster Bill
To get knots, simply align the middle '1' on the B scale with 5.7 on the A scale. Slide the cursor to the speed in YPS, or 16.2 (1.62) in our example, on the B scale. You can then read the speed in knots on the A scale right under the cursor, or in this example 9.35 knots.
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this is using the 1.62 to the Right of the middle "1", yes?
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Originally Posted by Puster Bill
If you are doing your calculations in meters instead, you would use 5.2 on the A scale to give speed in knots.
You now have everything you need, distance, AOB, and speed in knots. You could print up a chart with common YPS/Knot equivalencies if you are lazy.
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or make an excel spreadsheet to do it for me!
Thanks