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Advanced Marksmanship cosine chart needed

twat_daddy

Private
Minuteman
Mar 17, 2009
1
0
I need a cosine chart for angle shooting that i can copy and paste out of the browser ito notepad or wordpad. Trying to get some data consolidated. And if somebody could help what is the average speed of a running target? i believe it is 8-10fps maybe 10-12fps, if you know the answer i would appreicate it. thanks for your time.
 
Re: cosine chart needed

Excel has a cosine function. If you don't have a spreadsheet program, there's an online calculator here:

http://www.calculator.com/calcs/calc_sci.html

Just enter the angle, in degrees, and hit the "COS" button.

There is also a cosine table here:

http://www.grc.nasa.gov/WWW/K-12/airplane/tablcos.html

Moving targets don't have an average speed.

A slow walk is about two miles per hour. A fast walk is about four miles per hour. A person running an 8-minute mile is running about 7.5 miles per hour.

To calculate that in fps, multiply the MPH figure by 1.47.

 
Re: cosine chart needed

not sure how helpful to your purpose this is but a mediocre sprinter (4.8 sec 40yards) equates to about 25fps. far as cosine goes get a scientific calculator(solar powered preferably) for your kit.
 
Re: cosine chart needed

these are the figures used by the US army marksmanship unit / US shooting team

ANGLE> 0 1-8 9 10 11 12 13 14 15 16 17 18
COSINE> 1 .99 .98 98 .98 .97 .97 .97 .96 .96 .95 .95

ANGLE> 19 20 21 22 23 24 25 26 27 28 29 30
COSINE> .95 .94 .93 .93 .92 .91 .9 .89 .89 .89 .87 .86

ANGLE> 31 32 33 34 35 36 37 38 39 40 41 42
COSINE> .86 .84 .84 .82 .82 .80 .80 .78 .78 .78 .75 .74

ANGLE> 43 44 45 46 47 48 49 50 51 52.5 55
COSINE> .73 .72 .70 .69 .68 .67 .65 .64 .605 .605 .57

ANGLE> 57.5 60 62.5 65 67.5 70 72.5 75
COSINE> .53 .5 .46 .42 .38 .34 .30 .26

ANGLE> 77.5 80 90
COSINE> .215 .17 0

YARDS X COSINE=ACTUAL YARDAGE TO USE IN THE FIELD TO MAKE SLOPE ADJUSTMENTS

example: 500 yards at a 25 degree angle = .9 cosine value, or..
500 x .9 = 450 yards

 
Re: cosine chart needed

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">YARDS X COSINE=ACTUAL YARDAGE TO USE IN THE FIELD TO MAKE SLOPE ADJUSTMENTS</div></div>

For small angles at short distances, that's OK. Not at longer distances.

Better is called the Improved Rifleman's Rule: take your dope for the actual distance, and multiply that by the cosine of the angle.

For references, see:

Angled Fire Explained

There is a more accurate method in that reference, but it's only needed for steep angles at really long distances.