Slide Rule Targeting for SHIII/SHIV

MrSargyano · 06-25-08, 05:31 PM

What is the 3 minute 15 second rule?

Also, I did a dry run with 280° @ 4000 yards (A) and 283.5° @ 3200 yards 195 seconds later. I have 1.5 SHIV w/RFB -TMO so contacts are present, so I had 'general' ranges. Stadimeter and me do not seem get along even with SCAF that is integrated into RFB. Definately not at these ranges.

According to my calculations, observation A has an AoB of 13.5° and observation B has an AoB of 17°. Correct me if I am wrong on any of this please.

With a difference of only 3.5° I could not go down far enough on the standard S scale (<6-90). I got stuck. Now I presumed that I could use ST and read from the D. This gave me the number 8.35. I figured I needed to move the decimal over once more to the left. I wind up with 835 units/yards. Measuring on my map between my two marks gave 850 aproximately. While this seems close, there are a heckuva' lotta' numbers on this thing! confirmation would be greatly apreciated.

At this stage I'm sorta' lost in decimal transitions. I then slid 1.95 (seconds) on the C scale to .835 (units/yards) on the D scale (the very left of it). The right hand index mark of the C scale pointed to 9.4 (units per second) on the D scale.

So, now for the 'prestige'. I slide 5.6 on the C scale to 9.4 on the very, very left of the D scale and get my right hand C index at 9.4 (knots).

So now that I have typed all of this, I get the feeling that the '3 minute 15 second rule' means i do not have to translate 'units' to 'knots'. Needless to say I could still use some clearification on the moving of the decimals if nothing else.

Thanks in advance,
Mr Sargyano

PS I am currently useing the slide at http://www.antiquark.com/sliderule/s...tual-n3-t.html

06-25-08, 05:31 PM	#23
MrSargyano Watch Join Date: Jun 2008 Location: Greenville, South Carolina Posts: 24 Downloads: 0 Uploads: 0	3 minute 15 second rule? What is the 3 minute 15 second rule? Also, I did a dry run with 280° @ 4000 yards (A) and 283.5° @ 3200 yards 195 seconds later. I have 1.5 SHIV w/RFB -TMO so contacts are present, so I had 'general' ranges. Stadimeter and me do not seem get along even with SCAF that is integrated into RFB. Definately not at these ranges. According to my calculations, observation A has an AoB of 13.5° and observation B has an AoB of 17°. Correct me if I am wrong on any of this please. With a difference of only 3.5° I could not go down far enough on the standard S scale (<6-90). I got stuck. Now I presumed that I could use ST and read from the D. This gave me the number 8.35. I figured I needed to move the decimal over once more to the left. I wind up with 835 units/yards. Measuring on my map between my two marks gave 850 aproximately. While this seems close, there are a heckuva' lotta' numbers on this thing! confirmation would be greatly apreciated. At this stage I'm sorta' lost in decimal transitions. I then slid 1.95 (seconds) on the C scale to .835 (units/yards) on the D scale (the very left of it). The right hand index mark of the C scale pointed to 9.4 (units per second) on the D scale. So, now for the 'prestige'. I slide 5.6 on the C scale to 9.4 on the very, very left of the D scale and get my right hand C index at 9.4 (knots). So now that I have typed all of this, I get the feeling that the '3 minute 15 second rule' means i do not have to translate 'units' to 'knots'. Needless to say I could still use some clearification on the moving of the decimals if nothing else. Thanks in advance, Mr Sargyano PS I am currently useing the slide at http://www.antiquark.com/sliderule/s...tual-n3-t.html