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Re: [OM] shutter speed

Subject: Re: [OM] shutter speed
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 21 Dec 2009 17:30:07 -0500
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.
>>
>>
>> --
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>>
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