Altitude Speed Of Sound Chart?

[JoeMartin]

Has anyone done an Altitude Speed of Sound Chart?

To make a long story short, I live at approximately 4000 ft.
above sea level. I found a balistics chart and ran some numbers
for the 40 grain .22LR at 1085 fps... (Not sure I did everything
right with the chart), anyway, the results say that Speed of sound
where I live is 1117 fps.

Anyone know if this would be correct? I understand speed of sound
will vary with altitude...

 

[TNT]

Re: Altitude Speed Of Sound Chart?

Doesn't sound too far off. You can look at a table of mach numbers vs. altitude here.

http://www.aerospaceweb.org/question/atmosphere/q0112.shtml

Increased alt, decreased pressure, decreased speed of sound...makes sense but I'd check multiple sources to get a better idea of the #s you should be seeing

 

[JoeMartin]

Re: Altitude Speed Of Sound Chart?

Thanks Thomas, I'll do some reading up on these charts.

I wasn't sure if the 1117 fps at my 4000' elevation was in the ball park or not? It does open the door for testing of the Federal 711B (1080 fps), and the Eley Sport (1085 fps), with an outside shot at Winchester T22 (1150 fps) to see the effect of how Standard Velocity will perform agains Subsonic Velocities. I also think it would be a good idea to get my hands on some Wolf MT (1050 fps) for my testing.

 

[Shiraz]

Re: Altitude Speed Of Sound Chart?

Speed of sound chart

The speed of sound in air is only dependent on the air's temperature.

altitude/elevation, Barometric pressure or air pressure has no effect.

Humidity has a slight effect on the speed of sound in air.
The speed of sound is slightly faster in more humid air.

Speed of Sound in AIR.

Air Temp Speed of Sound
0F 1051 FPS
10F 1062 FPS
20F 1074 FPS
30F 1085 FPS
40F 1096 FPS
50F 1106 FPS
60F 1117 FPS
70F 1128 FPS
80F 1138 FPS
90F 1149 FPS
100F 1159 FPS
110F 1169 FPS




[edit] for clarity

 

[Greg Langelius *]

Re: Altitude Speed Of Sound Chart?

My thoughts are about what effect this info will have on your shooting.

Rather than cogitating and calculating, just go out and shoot the danged thing. It will do whatever it's going to do whether one has a firm grasp on the local Mach velocity or not.

Greg

 

[JoeMartin]

Re: Altitude Speed Of Sound Chart?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Shiraz</div><div class="ubbcode-body">Speed of sound chart

The speed of sound in air is only dependent on the air's temperature.

altitude/elevation, Barometric pressure or air pressure has no effect.

Humidity has a slight effect on the speed of sound in air.
The speed of sound is slightly faster in more humid air.

Speed of Sound in AIR.

Air Temp Speed of Sound
0F 1051 FPS
10F 1062 FPS
20F 1074 FPS
30F 1085 FPS
40F 1096 FPS
50F 1106 FPS
60F 1117 FPS
70F 1128 FPS
80F 1138 FPS
90F 1149 FPS
100F 1159 FPS
110F 1169 FPS




[edit] for clarity </div></div>

I've got this chart saved for future reference, Shiraz. You can never be armed with enough information. Thanks!

 

[wksinatl]

Re: Altitude Speed Of Sound Chart?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Greg Langelius *</div><div class="ubbcode-body">My thoughts are about what effect this info will have on your shooting.

Rather than cogitating and calculating, just go out and shoot the danged thing. It will do whatever it's going to do whether one has a firm grasp on the local Mach velocity or not.

Greg </div></div>

Depends on where you are shooting (within ear-shot of grumpy neighbors, etc).

If you are trying to avoid the sonic crack it is a huge deal.

Keith

 

[Greg Langelius *]

Re: Altitude Speed Of Sound Chart?

KS;

If that's what this question is about, then I gladly defer to your wisdom. I agre, it would be a significant issue.

Greg

 

[SethBargo]

Re: Altitude Speed Of Sound Chart?

If speed of sound is affected only by air, the yes altitude does come into play. In different altitudes the air has different densities and properties.

 

[Dylan in AZ]

Re: Altitude Speed Of Sound Chart?

Good job, you brought a 3 year old thread back from the dead!

 

[SethBargo]

Re: Altitude Speed Of Sound Chart?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Terror!</div><div class="ubbcode-body">Good job, you brought a 3 year old thread back from the dead!

</div></div>
I found this thread doing a google search so I wanted to put my .02 in lol. I might turn a small ember into a roaring flame lol.

 

[r44astro]

Re: Altitude Speed Of Sound Chart?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Shiraz</div><div class="ubbcode-body">Speed of sound chart

The speed of sound in air is only dependent on the air's temperature.

altitude/elevation, Barometric pressure or air pressure has no effect.

Humidity has a slight effect on the speed of sound in air.
The speed of sound is slightly faster in more humid air.

Speed of Sound in AIR.

Air Temp Speed of Sound
0F 1051 FPS
10F 1062 FPS
20F 1074 FPS
30F 1085 FPS
40F 1096 FPS
50F 1106 FPS
60F 1117 FPS
70F 1128 FPS
80F 1138 FPS
90F 1149 FPS
100F 1159 FPS
110F 1169 FPS




[edit] for clarity</div></div> Jet pilots will tell you it's all about temperature.

 

[Dylan in AZ]

Re: Altitude Speed Of Sound Chart?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SethBargo</div><div class="ubbcode-body">I found this thread doing a google search so I wanted to put my .02 in lol. I might turn a small ember into a roaring flame lol.</div></div>
Sorry, I didn't mean anything was wrong with you bringing an old thread back up to the top. This one is actually worth the discussion.