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Author Topic: Bullet speed  (Read 1325 times)

Offline Dream Child

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Re: Re: Re: Re: Bullet speed
« Reply #30 on: July 30, 2007, 06:38:27 PM »
Quote
Originally posted by Lusche
I only have the real world data for German ammo, but a 13mm round (if someone wants to know the exact type of round: Pzgr.Patr L'Spur el o.Zerl) needs 1.967 seconds to travel to 800m (879yds), a 20mm MG 151 round (M-Geschoss) 2 seconds.

So you observation of about 2 seconds does not look like a bug to me. :)


As I recall, one of the reason's the .50 BMG was so popular in air to air combat was it's relatively flat trajectory compared to much of the other stuff. The real thing traveled 800 yards in about 1 second, dropping less than 200 inches. A bullet traveling for 2 seconds will drop approximatly 4 times as much as one traveleing for 1 second.
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Offline Lusche

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Bullet speed
« Reply #31 on: July 30, 2007, 07:09:16 PM »
I just did a small test. Took a F6F and fired at a target at 800yds. I recorded that with FRAPS, then examined the film on a frame by frame base. Bullet flight time was just about 1 second, maybe 1.1 at most. Did that several times, just to be sure.

How did you measure the time of flight in your test?
« Last Edit: July 30, 2007, 07:12:23 PM by Lusche »
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Offline Widewing

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« Reply #32 on: July 30, 2007, 07:34:05 PM »
Quote
Originally posted by Lusche
How did you measure the time of flight in your test?




My regards,

Widewing
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My regards,

Widewing

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Offline FBplmmr

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Bullet speed
« Reply #33 on: July 30, 2007, 07:39:17 PM »
:rofl :rofl

Widewing :aok
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Offline TalonX

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« Reply #34 on: July 30, 2007, 07:42:08 PM »
Quote
Originally posted by kvuo75
Modern Ballistics Data Created: 07/30/07 13:44:16

Firearm: Default
Cartridge: .50 BMG
Conditions: Default
Range (yds):            50    100    200    400    600    800   1000   1200   1400   1500
----
Drop (inches)         0.56   2.27   9.27  38.80  91.60 171.21 281.92 428.93 618.59 731.80
Height (inches)       3.18   6.71  10.18   1.58 -30.27 -88.94-178.70-304.76-473.48-576.22
Height (moa)          6.07   6.40   4.86   0.38  -4.82 -10.62 -17.06 -24.25 -32.29 -36.68
Height (mils)         1.76   1.86   1.41   0.11  -1.40  -3.09  -4.96  -7.05  -9.39 -10.67
Windage (inches)      0.08   0.31   1.27   5.25  12.23  22.56  36.62  54.87  77.83  91.27
Windage (moa)         0.15   0.30   0.61   1.25   1.95   2.69   3.50   4.37   5.31   5.81
Windage (mils)        0.04   0.09   0.18   0.36   0.57   0.78   1.02   1.27   1.54   1.69
Time (S)             0.054  0.109  0.221  0.458  0.712  0.985  1.280  1.597  1.942  2.126
Velocity (ft/S)       2755   2710   2621   2448   2280   2119   1963   1814   1670   1600
Energy (ft-lbs)      12635  12226  11437   9975   8658   7475   6418   5478   4644   4265
PF                    2066   2032   1966   1836   1710   1589   1472   1360   1253   1200
Group (inches)        0.02   0.08   0.34   1.40   3.26   6.01   9.75  14.61  20.72  24.30
Group (moa)           0.04   0.08   0.16   0.33   0.52   0.72   0.93   1.16   1.41   1.55
Group (mils)          0.01   0.02   0.05   0.10   0.15   0.21   0.27   0.34   0.41   0.45
Groups <= desired    0.00%  0.00%  0.00%  0.00%  0.00%  0.00%  0.00%  0.00%  0.00%  0.00%
1 grp of <= desired    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0
-----
Constants:
Mid rng Ht (in)    10.3   Midrange (yds)     219.6  Zero (yds)         415.4  
Near zero (yds)    14.8   P.B. Size (in)     20.55  P.B. Range (yds)   494    
M.V. (ft/S)        2800   M.V. SDev (fps)    0.0    B.C.               1.050  
Mass (grains)      750    Sight Ht (in)      1.50   Indicated SA (moa) 10.00  
SA Offset (moa)    0.00   Barometer          29.53  Incline (deg)      0      
Wind (mph)         10     Wind error (mph)   2      Wind (deg.)        90    
Temp (F)           59     Alt. (feet)        0      Gravity            32.17  
Shots per group    5      Bullet acc. (moa)  0.00   Desired Grp (moa)  1.00  
Group Simulations  500    
----
Firearm name: Default
Firearm notes:
Cartridge name: .50 BMG
Cartridge notes: BC is for Hornady A-Max.  MV is for max load of H50BMG.
Conditions name: Default
Conditions notes:



courtesy of the free program http://www.modernballistics.com/


Now we have real data....   take a look at the velocity profile (by the way, this is a function of the ballistic coefficient, as well as density).   The "average" velocity is about 2400 fps over the 800 yards...  This means it would take about the 1 second he projected.

So, who the heck knows?  LOL   It should take a second...  On a separate note, the sound of the hit would be at the shooter two seconds later... Interesting.

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Offline Lusche

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« Reply #35 on: July 30, 2007, 07:46:09 PM »
Quote
Originally posted by TalonX
This means it would take about the 1 second he projected.

So, who the heck knows?  


We do. It takes 1sec in game too. See my post above ;)
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Offline Dream Child

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« Reply #36 on: July 30, 2007, 07:54:03 PM »
Quote
Originally posted by Lusche
I just did a small test. Took a F6F and fired at a target at 800yds. I recorded that with FRAPS, then examined the film on a frame by frame base. Bullet flight time was just about 1 second, maybe 1.1 at most. Did that several times, just to be sure.

How did you measure the time of flight in your test?


I did a film, but AH's recorder doesn't show the target, so I wasn't able to look at it that way. Apparently Widewing's method didn't work too well for me. At this point I'll take your word that you got accurate information. This is the first reply that gave any good way to test this.
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Offline stickpig

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« Reply #37 on: July 30, 2007, 08:27:14 PM »
Does anyone really give a #$$% ?
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Offline redman555

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« Reply #38 on: July 30, 2007, 08:35:08 PM »
ok...:huh ... only got 1 thing to say......SQEEKER!!!!!!!!!!! :O :D , o and wide wing nice watch rofl, i think i know wat u mean by the mouse.... in other words wat i said on first line :D


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« Last Edit: July 30, 2007, 08:51:28 PM by redman555 »
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Offline Husky01

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Bullet speed
« Reply #39 on: July 30, 2007, 08:40:17 PM »
Quote
Originally posted by redman555
ok...:huh ... only got 1 thing to say......SQEEKER!!!!!!!!!!! :O :D , o and wide wing nice watch rofl, i think i know wat u mean by the mouse.... in other words wat i said on first line :D


Pot meet Kettle. Kettle meet Pot.
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Offline SAS_KID

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« Reply #40 on: July 30, 2007, 08:48:37 PM »
Kettle meet Pot. Pot meet Kettle.
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Quote from: hitech on Today at 09:27:26 AM
What utter and compete BS, quite frankly I should kick you off this bbs for this post.

The real truth is you do not like the answer.

HiTech

Offline redman555

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« Reply #41 on: July 30, 2007, 08:51:08 PM »
huh rofl???


-BigBOB1
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Offline fuzeman

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« Reply #42 on: July 30, 2007, 08:58:24 PM »
I think the air in Aces High is denser than your average air, least it seems that way to me.
Then again it might depend on who just exhaled.
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Offline TinmanX

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« Reply #43 on: July 30, 2007, 09:17:21 PM »
Quote
Originally posted by Husky01
Pot meet Kettle. Kettle meet Pot.


Sounds like a fun cuppa.
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Offline ariansworld

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Bullet speed
« Reply #44 on: July 30, 2007, 09:53:01 PM »
Quote
Originally posted by dedalos
Maybe he was using old bullets.  Like old people they also slow :D
:rofl :rofl :rofl :rofl  LMAO
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