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O/T Electric BB Shooter
Posted: Wed Dec 29, 2010 5:01 am
by evilvet
Posted: Wed Dec 29, 2010 7:18 am
by velocity3x
IMO, not a practical design to achieve performance.
The article states that a swing radius of 6in spinning at 20krpm will deliver a velocity of over 5,000fps. It won't!
Posted: Wed Dec 29, 2010 11:23 am
by Technician1002
Dividing 20,000 by 60 only gives 333 revs per sec.
The article claims a muzzle velocity of only 25 feet per sec.
Posted: Wed Dec 29, 2010 11:45 am
by Ragnarok
Technician1002 wrote:Dividing 20,000 by 60 only gives 333 revs per sec.
And thus a muzzle velocity of a still respectable ~1,050 fps.
Posted: Wed Dec 29, 2010 5:52 pm
by Zeus
I saw that in the PMJB volume something, if it was a viable option it would already be in use.
Anyway accuracy would be woeful.
Posted: Thu Dec 30, 2010 1:01 am
by HunterT
The Mythbusters did something similar to this. They built a steam machine gun. It used an air impeller to spin a piece of pipe and they fed ball bearings into it through a hollow axle. They spun it up to about 3000 rpm I believe.
It wasn't very effective. It couldn't "injure" their ballistics gel dummy at long ranges. They never figured out it's velocity, but I'm guessing it was about 320 fps(3000rpm & ~1ft radius).
See
here
Posted: Mon Jan 03, 2011 6:01 pm
by jackssmirkingrevenge
Zeus wrote:if it was a viable option it would already be in use.
indeed, the
DREAD would be more than just an awkward promo presentation.
