[Milsurplus] Milsurplus Digest, Vol 163, Issue 28

[Bob Camp]

Hi

Depending on the bore of the artillery, the 500 per second could well be correct. 

The Mark 12 5” Navy gun had a rifling rate of 1 in 157” (13 feet). Muzzle velocity
was around 2,500 FPS. That gets you to 192 revs per second or 11,500 RPM. A
smaller bore weapon might easily hit the 500 revs number since rifling scales with
bore size. 

Bob



> On Nov 13, 2017, at 10:50 AM, Jeff Kruth via Milsurplus <milsurplus at mailman.qth.net> wrote:
> 
> Hi!
>  
> I think there is an error in the article cited:
>  
>  To convert it to a workable device required the development of radio components rugged enough to withstand an acceleration force 20,000 times stronger than normal earth’s gravity and a centrifugal force set up by approximately 500 rotations per second.
>  
> Pretty fast rotation, probably should be 500 RPM. Otherwise the rotating band would strip right through the barrel lands of the cannon.
>  
>  
> Regards,
> Jeff Kruth
>  
> In a message dated 11/13/2017 3:03:15 A.M. Eastern Standard Time, milsurplus-request at mailman.qth.net writes:
> http://www.smecc.org/radio_proximity_fuzes.htm
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