Re: Gun barrel

["Daniel L. MacIsaac" <macisaac@bohr.phy.nau.edu>]

Yes,

Powder temperature has a strong effect on maximum range and high accuracy
in tank gunnery, modern battle tanks correct for this with digital or even 
analogue computers.  It is far from instantaneous.

Dan M

Dan MacIsaac, Assistant Professor of Physics and Astronomy, Northern AZ Univ
danmac@nau.edu  http://www.phy.nau.edu/~danmac/homepage.html

> Hi,
> 	I think direct application of the gas laws may be complicated 
> because the burn of the gun powder is not instantaeous.  My impression is 
> that the burn time is a fair fraction of the time the bullet is in the 
> barrel.  Different gun powders have different burn rates and if one is 
> using the maximum charge of powder, the speed of the burn can be important
> in keeping the gun together.  Gun people, just like engine people do not
> speak of explosions in the chamber or the cylinder of the engine, but a 
> controlled burn.
>
> Thanks
> roger Haar   U of AZ