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Why two chronographs

 
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  #1  
Old 07-26-2009, 01:44 PM
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Why two chronographs

Why do you need two chronographs if you want to measure velocity at different ranges for your software? Could'nt you just use one then move it further out? What's the advantage of two?
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Old 07-26-2009, 04:34 PM
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Re: Why two chronographs

First off I have never tried to calculate BC from chrono data.
I think the reason people want to use two is so that you can see the exact velocity loss for that one projectile.
If you only use one chrono then you would need to have a load that gave minimal ES and fire a resonable number of rounds (10 or more?) to get an average.
My gut feeling is that the velocity loss from several projectiles will be different so you will need to average them anyway, but you would probably need to fire less rounds.

Stu.
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Old 07-26-2009, 04:37 PM
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Re: Why two chronographs

It just simply isnt accurate enough to get an average and then move the chrony further out. You really NEED to know the actual starting velocity and the ending velocity of any given shot for the best results. I have tried both methods and hands down, the double chrony method works the better of the 2.
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Old 07-26-2009, 05:52 PM
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Re: Why two chronographs

Old Chinese saying:

"Man with one clock always know what time it is.
Man with two clocks never know what time it is."

Maybe this wisdom also applies to chronographs?
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Old 07-26-2009, 06:56 PM
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Re: Why two chronographs

Quote:
Originally Posted by LewisH View Post
Old Chinese saying:

"Man with one clock always know what time it is.
Man with two clocks never know what time it is."

Maybe this wisdom also applies to chronographs?
For muzzle velocity purposes only, you may be right.

For the purposes of testing a ballistic coeffiecient, the only way to beat 2 chronies may be the ohler acoustic set up and definatley doppler radar. Other than that, a cheap, easy way to get you a number to get started at LR is to shoot through double chronies.
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Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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  #6  
Old 07-26-2009, 06:59 PM
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Re: Why two chronographs

M.E. is right!If you want to get serious and get your info as precise as affordable it's the only way to go.
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Last edited by jmason; 07-26-2009 at 07:52 PM.
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