Correct. The propellant is in the shell. It could still be
accelerating but it's immaterial to the original calculations since I
specifically queried the muzzle velocity. I also believer the different
muzzle velocities given were for different types of shell for that 60mm
mortar.
Chuck Norcutt
Charles Geilfuss wrote:
> Ian,
> If it were a standard shell I would agree; the propellant is in the shell
> and the shell remains behind. However in a mortar round the propellant is
> part & parcel of the round so it is more like a rocket. But I could be
> wrong. By the time it leaves the tube it may have used all its propellant.
>
> Charlie
>
> On Mon, Dec 21, 2009 at 3:05 PM, Ian Nichols <ian.a.nichols@xxxxxxxxx>wrote:
>
>> 2009/12/21 Charles Geilfuss <charles.geilfuss@xxxxxxxxx>:
>>> My guess would be that the shutter speed is not as fast as you would
>> think
>>> but that the timing was exquisite. At the beginning of the shot
>> acceleration
>>> is very high but speed is still relatively slow. I'll guess 1/500 to
>> 1/2000.
>>
>> But the shell is emerging from the tube, so surely its acceleration
>> phase is over and it is now moving as fast as it ever will, and
>> gravity will now be slowing it down again.
>>
>>
>> --
>> Stand firm for what you believe in, until and unless logic and experience
>> prove you wrong. Remember: when the emperor looks naked, the emperor *is*
>> naked, the truth and a lie are not "sort-of the same thing" and there is
>> no aspect, no facet, no moment of life that can't be improved with pizza.
>>
>> -Daria Morgendorffer
>> --
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|