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Cosine or degrees which do you prefer?

 
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  #1  
Old 11-18-2009, 06:46 PM
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Cosine or degrees which do you prefer?

I have both a cosine indicator and a degree indicator which 1 do you prefer to use or find easier.
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Old 11-18-2009, 07:20 PM
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Re: Cosine or degrees which do you prefer?

It depends on what method you use to correct for the angle.

If you use a ballistics program that accepts degrees as an input, naturally you want the device to measure degrees.

However, if you're using range cards, the cosine is more convenient because you just multiply the drop by the cosine.

Consider how you're going to use the 'look-angle' information, and that will tell you how you need it indicated.

-Bryan
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Old 11-18-2009, 09:44 PM
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Re: Cosine or degrees which do you prefer?

I use exbal but if it was to shut down or battery go flat it sounds like my cosine 1 would be easier to use with the range card back up.
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Old 11-18-2009, 09:56 PM
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Re: Cosine or degrees which do you prefer?

Bryan, don't you mean Drop*[1-COS(@)]
If you would have 100" drop level, but shooting at 30deg,, 100*COS(30deg) would appear to be 15.4"
Where 100"*[1-COS(30)] would be 84.6" (I believe this).
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Old 11-18-2009, 10:01 PM
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Re: Cosine or degrees which do you prefer?

Some one ought to check with Shawn Carlock and or Buffalobob regarding this thread. There was a thread on this subject several years ago but I've had know luck finding it.

The key seems to be where to insert the cosine into the eq'n..........
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Old 11-18-2009, 10:43 PM
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Re: Cosine or degrees which do you prefer?

Quote:
Originally Posted by Mikecr View Post
Bryan, don't you mean Drop*[1-COS(@)]
If you would have 100" drop level, but shooting at 30deg,, 100*COS(30deg) would appear to be 15.4"
Where 100"*[1-COS(30)] would be 84.6" (I believe this).
Mike,
I think you have COS confused with SIN (or degrees confused with Radians).

COS of zero degrees is 1.0 [cos(0) = 1] so if the look angle is zero degrees, you multiply the drop by 1.0 (no change).

If the look angle is 30 degrees, COS(30) = 0.87; so you would multiply the drop by .87.

If we applied your equation (drop*[1-cos(@)]), the drop would be zero for all level shots: drop*[1-1].

I'm pretty sure you multiply the drop by the COS (cosine) of the look angle.

-Bryan
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  #7  
Old 11-19-2009, 07:31 AM
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Re: Cosine or degrees which do you prefer?

My Bad.
My ACIs are in degrees, and I tend to think about it as I'm used to seeing it.
I enter degrees into a ballistic spreadsheet, that corrects PATH.
Basically adding DROP*(1-COS(@*PI()/180))
I'm taking care of the Deg/Radian part there..

But the Cosine ACIs pretty much take it to 'percent of' as indicated.
So there would not even be 30degs indicated with these, for that angle.
It's cleaner

My appologies to the poster, and Bryan thanks for the correction.

Last edited by Mikecr; 11-19-2009 at 10:05 AM.
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