Range Report Kinght's Armament Ballistic Computer

#2
Re: Kinght's Armament Ballistic Computer

Yeah, I figured for the price why not, I like the interface, its very mac-ish. I haven't gotten a chance to use it yet as I am overseas but I will find out how accurate it is in about a month. Hopefully KAC will see fit to continue to improve and expand upon it. Has anyone gotten a chance to field test it yet?
 
#3
Re: Kinght's Armament Ballistic Computer

I consulted with the developer on this app.

I don't have an iPhone to verify the final product, but if it got implemented the way we discussed, it's very accurate.

Checking against JBM with common inputs is my recommended way of verifying the accuracy of a ballistics program.

Checking against field data is a way to verify how accurate your field inputs are.
 
#5
Re: Kinght's Armament Ballistic Computer

I get more accurate field data results with Bulletflight than JBM at mid-long ranges. For some reason I have to increase MV 50-100fps to get the JBM to match up correctly. But, then again, I'm not the JBM Ninja my fellow shooting partners are either.
 
#6
Re: Kinght's Armament Ballistic Computer

I love mine. I got tired of waitning and made my own bracket to attach it like the one on their web-site. It folds flat against the rifle when not in use, then swings out. Allows the angle to be read while on the rifle. So far all data has been dead on.
 
#7
Re: Kinght's Armament Ballistic Computer

Now people are bolting iphones to their rifles?! Is that what the mount is for?


Anyone use Ballistics F.T.E.?
 
#8
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JFComfort</div><div class="ubbcode-body">Now people are bolting iphones to their rifles?! Is that what the mount is for? </div></div>

It is great for comps, lets you make adjustments as you shoot without getting off the rifle.
 
#9
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 257speed</div><div class="ubbcode-body">I love mine. I got tired of waitning and made my own bracket to attach it like the one on their web-site. It folds flat against the rifle when not in use, then swings out. Allows the angle to be read while on the rifle. So far all data has been dead on. </div></div>
I tried to send you a pm but it wont let me... wanna send me one of thses mounts or explain how you made it? I would be willing to buy one.
-Felipe
 
#11
Re: Kinght's Armament Ballistic Computer

I am the author of the KAC program.

There are many reasons why I like the way BulletFlight is implemented.

The UI of BulletFlight is optimized for field use rather than use at home. Everything you need to see at any give time is shown on the screen at once and there is no scrolling.

It does spin drift, Coriolis effect, and has many advanced features. It does a nice looking range-card but also has a range wheel to give a direct answer to what you are currently shooting at. Moreover, the computations are accurate and it does things that most other programs don't, such as factors in the sight-in weather as well as the current shooting weather. So if you sight in at 5000 feet altitude and then shoot at sea level, that is handled automatically.

Features are added as people request them which happened a lot at first but now people mostly just sent stories about how they are using it.
 
#12
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">No ballistic app on any platform has as accurate a BC database as BulletFlight.</div></div>

I have Bryan's book. He measured his own G7 BCs - and they are not derived from doppler radar data.

Those BCs are available to anyone who buys Bryan's book.

In addition, the same G7 BCs are available in JBM Ballistics. The program doesn't tell you what the BCs are in the program's bullet library, but it is using Bryan's BCs.

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">It does spin drift, Coriolis effect, and has lots of advanced features. Moreover, the computations are exceedingly accurate and it does things that other programs don't, such as factors in the sight in weather as well as the current shooting weather.</div></div>

Exbal does all of the things you mention. So does Field Firing Solutions. Neither is using G7 BCs, although Perry Systems does have available a program, GModels, which does, as does the Point Mass Ballistics application included with Bryan's book.

However, the primary advantage of G7 BCs is that they more accurately calculate terminal velocity at extended ranges, which doesn't matter much in many applications.
 
#13
Re: Kinght's Armament Ballistic Computer

Lindy , your always an excellent source of information -funny you even know more info the Knights program uses than does its aurthor-ie dopplar bc's. Have you used the Knights program and have you found it as accurate as the lapua dopplar tests -I would imagine the lapua program would show if Bryan Litz's g7 caculations are right on --although saying that it appears everything other than dopplar raydar info needs massaging ?
 
#14
Re: Kinght's Armament Ballistic Computer

The post to which I responded says,

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">BulletFlight has Doppler radar measured G7 BCs. No matter how good your computational model is, if you don't give correct inputs you cannot get the best results. It was provided under license from Bryan Litz, author of the excellent book Applied Ballistics:</div></div>

I interpreted that to mean that he's using Bryan's G7 BCs. I have Bryan's book, which describes in detail how he measured the G7 BCs he uses. It wasn't using doppler radar.

I haven't checked Bryan's data against Lapua's. I don't shoot Lapua bullets, so it's not a subject which much interests me.

I have checked Bryan's G7 calculations for the Sierra bullet I shoot. It's spot on, which doesn't surprise me.

I strongly recommend Bryan's book.
 
#15
Re: Kinght's Armament Ballistic Computer

59238573.jpg


Taken from a UH-60 while flying near the Victory Base Complex just outside of Baghdad.
 
#16
Re: Kinght's Armament Ballistic Computer

I have some corrections to make. I was incorrect about Doppler radar being used to measure the BCs, and did not know they were in JBM. Sorry Bryan and everyone. Thanks Lindy.

 
#17
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lindy</div><div class="ubbcode-body">The post to which I responded says,

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">BulletFlight has Doppler radar measured G7 BCs. No matter how good your computational model is, if you don't give correct inputs you cannot get the best results. It was provided under license from Bryan Litz, author of the excellent book Applied Ballistics:</div></div>

I interpreted that to mean that he's using Bryan's G7 BCs. I have Bryan's book, which describes in detail how he measured the G7 BCs he uses. It wasn't using doppler radar.

I haven't checked Bryan's data against Lapua's. I don't shoot Lapua bullets, so it's not a subject which much interests me.

I have checked Bryan's G7 calculations for the Sierra bullet I shoot. It's spot on, which doesn't surprise me.
<span style="color: #FF0000">
I strongly recommend Bryan's book. </div></div></span>

I got it the other day and am starting to consume it , I know some find the info more easy to understand than others -Im getting there slowly with it and agree it is a book that all should have on there shelf,, very interesting !
 
#22
Re: Kinght's Armament Ballistic Computer

I have been trying to find it also on iphone application downloads and cant even enter the area of the site to find it -a real major effort with little reward so far-must be shitloads of people accessing the site -a direct link to the page would be great ! cheers
 
#25
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Skyking</div><div class="ubbcode-body">Yeah its on Itunes.I just typed bullet flight. Pulled it right up.

http://www.knightarmco.com/bulletflight/index.htm </div></div>

I know its on the link you have here which I can easily get to but when you click on it it takes you through to itunes and its a jungle from there --post the page address from itunes if you can find it please with the program down load link .cheers
 
#29
Re: Kinght's Armament Ballistic Computer

I also have both apps...well...HAD. my iTouch got JACKED a week ago...I have been trying to win the BulletFlight contest put on my KAC and now I am going to have to up the submissions cause I'm PISSED and can't afford to buy a new one.
 
#30
Re: Kinght's Armament Ballistic Computer

Found it , thanks for theinfo and the link for a hand held I would go this way over others. these seem to be more state of the art technology over the HP IpaQ series.

of coourse there is always the old

size of target X 1000 / mils = range as a back up
 
#31
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">these seem to be more state of the art technology over the HP IpaQ series.</div></div>

It's not obvious what you mean by that. The programs which run on the iPAQs include Field Firing Solutions and Exbal. Both are at least the equal of anything which runs on an Apple platform, and the former of those has a feature set which no other program can match.

FFS Features:

Use atmosphere, bullet and turret profiles generated on desktop.

Preset data (pressure, temperature, humidity and bullet parameters) needed for calculations may be input manually or from data files.

Field inputs are wind speed and direction; target range, speed, heading and shot angle.

Outputs are Elevation in Mil or MOA, Windage in Mil or MOA, Lead in Mil or MOA, turret setting, and windage corrected for turret click error.

Select English or metric input/output.

Range calculation files <span style="color: #FF0000">directly from rangefinder</span>, or map files using Latitude/ Longitude, UTM or MGRS coordinates.

Abbreviated trajectory at user selectable range increments listing, for each range, turret setting, time of flight, bullet velocity, elevation (both from zero and hold-off elevation from current target), windage and lead in Mils and MOA.

Target list for multiple target engagement.

Multiple wind vector capability for switching winds over the course of fire.

Offset profiles for accounting for change of POI due to changes in ammunition, position or shooter.

Tools to compute DK, scope calibration, field zero confirmation, muzzle velocity from chronograph data and calculator.

Summary page to see current program state; reference section for commonly used equations and conversion factors.
 
#32
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Swan</div><div class="ubbcode-body">I get more accurate field data results with Bulletflight than JBM at mid-long ranges. For some reason I have to increase MV 50-100fps to get the JBM to match up correctly. But, then again, I'm not the JBM Ninja my fellow shooting partners are either. </div></div>

I use JBM often and also have to consistently increase my mv by roughly 50-100 fps to match my actual shooting results. Does anyone else have this problem? I know I need a Kestrel to input exact correct conditions, primarily station pressure, but don't want to spend the cash right now. This may help to correct this, but I think I'm pretty close now using weather.com before shooting and inputting their pressure as corrected pressure with the correct altitude.
 
#33
Re: Kinght's Armament Ballistic Computer

Expecting precise elevation predictions from a ballistic program presupposes a few things, some of which are difficult to know, and some of which cannot be known precisely.

You must have precise knowledge of the velocity of each shot, well beyond the ability of most chronographs to measure even the average muzzle velocity of a group of shots, and you must know the temperature response of the muzzle velocity of your load.

You must know the real ballistic coefficient of the bullet you are shooting, which not only changes with velocity, but also varies a bit from bullet to bullet. Most manufacturers only published G1 BCs for their bullets, which does not fit well the shape of modern boattail bullets.

You must have carefully calibrated the click value of your scope, so that you know precisely what elevation you are dialing. And that value may not be linear, so measuring it over just one range is insufficient.

You may also need to take into consideration the Eötvös effect, what most people refer to, but isn't, coriolis effect.

You must take into consideration the elevation variation introduced by headwind or tailwind components, which means that you must have some means of measuring those components over the entire course of the trajectory.

So, with most programs, you're going to need to slightly modify the BC of the bullet and/or the muzzle velocity to get the program prediction to match your actual field shooting results.

My experience is that once that is done with a specific program, subsequent predictions will be quite accurate - but not perfectly accurate. But it's better than having no prediction at all, particularly for conditions which are markedly different than what one usually shoots in.

My standard advice on learning to shoot well with a precision rifle is to get one good rifle, a good scope, a good load, and then shoot the heck out of it after getting good training.

That applies to ballistic programs, too.

Familiarity through extensive experience with the tools of precision rifle shooting is the key to proficiency.

Having a limited number of tools to use makes that less difficult.
 
#34
Re: Kinght's Armament Ballistic Computer

Went out yesterday with the 300wm and 223. Swaro range finder, Kesley 3500. 713 yard the 300 was dead on. The 223 was three clicks off. 1/4 moa per click. Then went to 450 yards 223 was still dead on. Put the steel out to 1225 yards. The 300 was a half moa off. Hit the steel 8 out of 20 times with three different shooters. I am really liking this program. Also have the nightforce program as well.
 
#35
Re: Kinght's Armament Ballistic Computer



So, with most programs, you're going to need to slightly modify the BC of the bullet and/or the muzzle velocity to get the program prediction to match your actual field shooting results.

My experience is that once that is done with a specific program, subsequent predictions will be quite accurate - but not perfectly accurate. But it's better than having no prediction at all, particularly for conditions which are markedly different than what one usually shoots in.


[/quote]

Lindy I have a few programs but am utilizing the lapua doppler raydar info to tune them all as I utilize their 123GR 6.5HPBT-is this info from lapua the bible to work with -
 
#36
Re: Kinght's Armament Ballistic Computer

You have to admit the ability to mount the itouch to the rifle and have it correct for angle is something that the ipaq cannot do .
that is is your inclined to attach something to your rifle as I am not
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lindy</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">these seem to be more state of the art technology over the HP IpaQ series.</div></div>

It's not obvious what you mean by that. The programs which run on the iPAQs include Field Firing Solutions and Exbal. Both are at least the equal of anything which runs on an Apple platform, and the former of those has a feature set which no other program can match.

FFS Features:

Use atmosphere, bullet and turret profiles generated on desktop.

Preset data (pressure, temperature, humidity and bullet parameters) needed for calculations may be input manually or from data files.

Field inputs are wind speed and direction; target range, speed, heading and shot angle.

Outputs are Elevation in Mil or MOA, Windage in Mil or MOA, Lead in Mil or MOA, turret setting, and windage corrected for turret click error.

Select English or metric input/output.

Range calculation files <span style="color: #FF0000">directly from rangefinder</span>, or map files using Latitude/ Longitude, UTM or MGRS coordinates.

Abbreviated trajectory at user selectable range increments listing, for each range, turret setting, time of flight, bullet velocity, elevation (both from zero and hold-off elevation from current target), windage and lead in Mils and MOA.

Target list for multiple target engagement.

Multiple wind vector capability for switching winds over the course of fire.

Offset profiles for accounting for change of POI due to changes in ammunition, position or shooter.

Tools to compute DK, scope calibration, field zero confirmation, muzzle velocity from chronograph data and calculator.

Summary page to see current program state; reference section for commonly used equations and conversion factors.
</div></div>
 
#37
Re: Kinght's Armament Ballistic Computer

Nor am I inclined to attach an electronic device to my rifle, especially one not designed to withstand recoil impulses.

While that is certainly something I cannot do with an iPAQ or TDS Recon, I don't consider an asset something I have no intention of doing and which I think is a monumentally bad idea.
 
#38
Re: Kinght's Armament Ballistic Computer

"Checking against JBM with common inputs is my recommended way of verifying the accuracy of a ballistics program."

Ballistic and Ballistic FTE use the JBM engine as its core as of v2.0, so if you're looking for the calculator that's closest to JBM, Ballistic _is_ JBM for all practical purposes.
 
#41
Re: Kinght's Armament Ballistic Computer

I've been using the knights armament bullet flight for about a week now and so far I really like it. little tweaks here and there in the Pressure input needed, no biggy. It's designed towards field use and real easy to use. Plus it uses G7 BC's !
Just last night I downloaded an update for this app. Looks like they have fixed the Pressure input concern - station pressure vs barametric pressure. Range time will put it to the test.
 
#42
Re: Kinght's Armament Ballistic Computer

I purchased this program some time ago but have not yet had the chance to use it for a few reasons.

1) Brand new rem700p getting a warranty job before it has even fired a single round!
2) was waiting on my nightforce
3) When i get her fired, i still need to work out some handloads

I look forward to that day that everything is set-up in regards to the ballistic computer and my rifle/load
smile.gif
 
#43
Re: Kinght's Armament Ballistic Computer

Does anyone know if Bulletflight will ever be available for the Motorola Droids??

I considered getting an IPhone for this and other apps but the service sucks in my area. Glad I held out for the Droid, it's awesome. Although the app store is not as extensive as the IPhone's yet, I'm hoping as the popularity grows, app author's such as KAC will step up and make their products more widely available.

CM
 
#44
Re: Kinght's Armament Ballistic Computer

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rsilvers</div><div class="ubbcode-body">
59238573.jpg


Taken from a UH-60 while flying near the Victory Base Complex just outside of Baghdad.
</div></div>

Great shoot..
What Iphone cover is that. I need/want that...
 
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