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Ballistic FTE & KAC Bullet Flight Question

 
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  #1  
Old 09-27-2009, 09:29 PM
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Location: Grain Valley, MO
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Ballistic FTE & KAC Bullet Flight Question

I have both apps for the iPod Touch and there seems to be a discrepancy between the two ballistic algorithms each program runs. I can enter the exact same data in both applications but they show different energies, bullet flight paths, mil come-up's, etc. Could someone with (obviously) a greater mind than mine please explain this?

Thanks,

Jon
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  #2  
Old 09-28-2009, 03:30 AM
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Re: Ballistic FTE & KAC Bullet Flight Question

Jon,

I worked with Robert Silvers (developer of the KAC Bullet Flight program) on his app. I don't have the program, or any iThingys to run it, but my understanding is that he verified his program using JBM which is a correctly written solution.

Having never seen the FTE program, I can't comment on the difference(s), but I can tell you that whichever one better matches JBM is the more accurate program.

Take care,
-Bryan
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Bryan Litz
Ballistician

Author of: Applied Ballistics for Long Range Shooting
And: Accuracy and Precision for Long Range Shooting

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  #3  
Old 09-28-2009, 04:49 PM
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Re: Ballistic FTE & KAC Bullet Flight Question

Hi Bryan,

Thanks for the information. After reviewing both applications and comparing them against JBM's ballistic calculator the KAC software is the closest match. I'll stick with that one. Thanks again.

Jon
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  #4  
Old 09-28-2009, 04:52 PM
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Location: Philadelphia Pa.
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Re: Ballistic FTE & KAC Bullet Flight Question

Have Bullet Flight on my iphone and received this month two updates, the first don't rember but think was fixing some bugs and the one today was a fix for apps in meters
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  #5  
Old 09-28-2009, 07:56 PM
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Re: Ballistic FTE & KAC Bullet Flight Question

Ok, here are my findings and it's very interesting!

Below is a list of the data set constants. I set the same parameters for all three ballistics programs.

Manufacturer: Lapua
Description: Scenar (CD)
Caliber: 0.338
Weight: 300.0 gr
Zero: 100 yd
Muzzle Velocity: 2750.0 ft/s
Sight Height: 2.25 in
Line Of Sight Angle: 0.0 deg
Cant Angle: 0.0 deg
Wind Speed: 0.0 mph
Target Speed: 0.0 mph
Temperature: 59.0 F
Pressure: 29.92 in Hg
Humidity: 45.0 %
Altitude: 7600.0 ft

Here are the results of the different software programs (at random distances) in no particular order of importance:

Ballistic FTE:
Drop (in.) Mils
800 yd -142.23 4.9
1300yd -473.89 10.1
1800yd -1096.11 16.9

KAC Bullet Flight:
Drop (in.) Mils
800yd -144.9 5.0
1300yd -488.2 10.4
1800yd -1144.9 17.7

JBM Trajectory (Simplified)
Drop (in.) Mils
800yd -144.2 5.0
1300yd -484.3 10.3
1800yd -1131.2 17.5

I hope this helps everyone make a much more informed decision!

Jon

Last edited by jonthomps; 09-28-2009 at 08:01 PM.
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  #6  
Old 09-28-2009, 07:59 PM
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Location: Grain Valley, MO
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Re: Ballistic FTE & KAC Bullet Flight Question

nfhjr62,

Thank you for the feedback, I'll keep an eye out for updates. I'm currently running Bullet Flight 3.0.0 and I feel this app (as documented from my previous post) is a much more accurate program.
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