speed of sound ?

[VICIOUS]

Howdy; I was looking to work up a load for the handgun just UNDER the speed of sound .
So if it is 70 F at 1000 feet above sea level what do I do to find out the feet per second of the sound barrier ?

 

[Sheik]

You will find the formula at wikipedia

http://en.wikipedia.org/wiki/Speed_of_sound

 

[Terry Perkins]

1120 feet per second at 15 degrees Centigrade. Add 2 feet per second for every degree increase. Reverse with temperature drop.

 

[VICIOUS]

Thanks guys.

 

[H4831]

Speed of sound and bullet travel

If you are thinking of noise reduction, forget it. You will not notice the difference in sound whether it is going 1000 fps or 1250 fps. Some theories are hard to prove!

 

[Gibbs505]

That muzzel blast will be louder anyway!

 

[22lr]

there is muzzle blast plus sonic boom at subsonic speeds too. I think sonic boom starts creeping in at Mach 0.7 somewhere, so its rather academic question.

 

[ben hunchak]

The main part of the whole equation(whisper theory) is to use a very long, very high B.C.projectile so that the low vel. can be maintained best due to subsonic speeds. Most handgun loads are subsonic anyways, can't you tell by how quiet they are?

 

[Suputin]

This chart shows how the sonic crack is generated over a range of velocity. If you want relibaly subsonic ammo you need to shoot for about 1000 fps or slightly less.