SUBSIM Radio Room Forums - View Single Post - Submarine Attack Course Finder (a.k.a. Is-Was / Banjo)

don1reed · 05-11-07, 09:08 AM

One last item from my corner:

Do the Math.

I observe thru the scope a Hakusika Maru: Aspect Ratio 4.6 from the book.

Aspect Ratio thru the scope:
4.25 tics high
13 tics long.

Do I break out my hh electronic calc ? No, I reach for the SACF/IW:

Since the SACF is a cicurlar sliderule (logrithmic) with a sine scale:

As you can see, 25.1° falls beneath 4.25, the height of the target ship, so I then rotate the center disk to place the 25.1° mark under 13, dividing 4.24 into 13. The answer is read above the sine of 90° = 3.05, the observed Aspect Ratio.

I can now proceed to compare the two AR's to obtain my Angle on the Bow with the SACF.

4.6 : 90° : : 3.05 : 42°

Simple and fast

EDIT NOTE: Had to goto photobucket, ImageShack is having a bad day.

05-11-07, 09:08 AM	#108
don1reed Ace of the Deep Join Date: Dec 2004 Location: Valhalla: Silent Generation Posts: 1,149 Downloads: 910 Uploads: 0	Do the Math One last item from my corner: Do the Math. I observe thru the scope a Hakusika Maru: Aspect Ratio 4.6 from the book. Aspect Ratio thru the scope: 4.25 tics high 13 tics long. Do I break out my hh electronic calc ? No, I reach for the SACF/IW: Since the SACF is a cicurlar sliderule (logrithmic) with a sine scale: As you can see, 25.1° falls beneath 4.25, the height of the target ship, so I then rotate the center disk to place the 25.1° mark under 13, dividing 4.24 into 13. The answer is read above the sine of 90° = 3.05, the observed Aspect Ratio. I can now proceed to compare the two AR's to obtain my Angle on the Bow with the SACF. 4.6 : 90° : : 3.05 : 42° Simple and fast EDIT NOTE: Had to goto photobucket, ImageShack is having a bad day. __________________ During times of universal deceit, telling the truth becomes a revolutionary act. ~ George Orwell Last edited by don1reed; 05-11-07 at 09:49 AM.