Half a croissant, on a plate, with a sign in front of it saying '50c'
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faster bullet

bullet that actually speeds up
  (+4, -5)
(+4, -5)
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have you ever cut both ends off of a soda can, leaving a perfect cylinder. now throw it like a football. it floats like a frisbee, traveling great distances. now if you take the same theory apply it a bullet, what would you get? sniper shots at over two miles. if you imagine a hollow point bullet but drilled all the way through and then corked from the base of the bullet using propellant. i think when the primer ignites the powder in the casing, the powder launches the bullet down the barrel and ignighting the the base of the bullet with its propellant core before it exits. the bullet then speeds up until all propellant is used up leaving a hollow bullet that is screaming at incredible speeds. actually it might whistle. would be great for punching holes. I would call them rifle rockets or personell hole punchers.
pnip, Dec 18 2007

Gyrojet http://en.wikipedia.org/wiki/Gyrojet
Rocket bullets. Similar, but doesn't become entirely hollow. [ldischler, Dec 18 2007]

"Germany's Guns" (Terry Gander) http://www.amazon.c...ander/dp/1861261101
An excellent basic introduction to the subject [8th of 7, Dec 18 2007]

ramjet ammo Ramjet_20ammo
My own idea... similar, but possibly more effective. [ye_river_xiv, Mar 11 2008]


       "That's his stomach plug there, laying on the ground - that doesn't even seem possible"   

       (-), I'll reverse it if you can identify the source.
normzone, Dec 18 2007

       Bad science. Not to mention bad grammar, bad spelling, bad whatever "ignighting" is, and just being badly thought out.   

       Yes, it might whistle. In fact, it will definitely whistle. Whistling expends energy; see if you can guess where the energy comes from.   

       "bullet that actually speeds up"... good grief, kid. Drill a hole through your car, and see how fast it takes off down the road.
lurch, Dec 18 2007

       Gulp... is that [UB]? What timing. Nice to see you 'ol chap!   

       I wonder what would happen to a bullet created almost the opposite to this idea?   

       Instead of a bullet being hollow and filled with rocket fuel, coat it in a thin layer of the stuff - albeit it much slower burning. The purpose would be to decrease parasitic drag by removing the static boundary layer.   

       I was just thinking about supersonic torpedoes and how bubbling air over their surface helps reduce friction.
TIB, Dec 18 2007

       Whatever next?
Ideas for "Taller buildings" or "More powerful locomotives"?
School's out early this year [-]
AbsintheWithoutLeave, Dec 18 2007

       The Germans did a lot of research on this between 1933 and 1945, admittiedly mostly for larger calibres like the RAP artillery shell.   

       Hybrid systems like this sadly provide unpredicatble ballistics despite their apparent promise. Long experience has demonstrated that the best solutions are either pure gas-expansion projectiles or pure rockets.
8th of 7, Dec 18 2007

       Good idea. (Remarkable find, UB, but that 1894 bullet isn't filled with propellant.)
ldischler, Dec 18 2007

       // toroidal //   


       // blockage in the barrel //   

       Since the barrel is designed to withstand the unrestrained pressure of the propellant gases, there is no problem of skirt expansion.   

       The inaccuracy tends to arise since the force imparted by the "on-board" propellant charge increases the velocity of the projectile without proportionately incresing its speed of rotation; and since it is difficult to guarantee (without stabilising fins) that the thrust will be truly on-axis, this can induce further wander.   

       The alternative is to adopt the approach of the Wehrmacht's "Sechsling Nebelwerfer" of 1940, a 6-barreled rocket launcer based on the Pak 37 3.7cm anti-tank gun carriage. This used an annular array of angled venturis to impart forward motion and rotation; but quality control in manufacture was always a problem. With a tiny device like (say) a 5.56mm rifle round, the problem would be even more extreme.   

       The reduction in projectile mass is not compensated for by the additional velocity imparted by the propellant, significantly reducing on-target effects.
8th of 7, Dec 18 2007

       The initial versions were 15cm; the projectiles were of an unusual design, having the payload in the "tail" and the rocket motor in the front. Larger versions of artillery rocket (up to 28/32 cm) were produced, but had very limited ranges.   

       The 10-barrel launcher on its tracked chassis previsions the MLRS by many decades.   

8th of 7, Dec 18 2007

       I suspect that the ring-air interactions would be different at supersonic speeds.   

       I like this idea for a medieval missle - I can imagine a huge cylindrical dragon, loaded with gun, powder spun to speed by a team of loincloth-clad soldiers and sent over the castle wall to wreak havoc on the massed barbarian hordes.
bungston, Dec 18 2007


       "That's a lot of nuts!"
"We are both ventriloquists but now we're upside down. I swing a bit more." - "I swing a bit less."
"Yes, a tiny net is a death sentence, it's a net and it's tiny.
"I am a great magician: now your clothes are red!"
"Hey, just because the screen turned black, doesn't mean he's stopped."

       (now will you go and reverse a bone you gave me somewhere?)
globaltourniquet, Dec 19 2007

globaltourniquet, Dec 19 2007

       google ring airfoil   

       and its one of sam fisher's weapons in splinter cell
vmaldia, Dec 03 2009


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