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DREAD(perhaps BS, probably exaggeration)

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LAN_403

TheMerovingian

Tue Feb 06 2007, 01:28PM

Registered Member #14 Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383

It looks unrealistic. Also, if it would work properly, don't you think that the military would have beat on time this "scientist"? (military invest 30% of the world resources in weapon research)

Madgyver

Tue Feb 06 2007, 02:31PM

Registered Member #177 Joined: Wed Feb 15 2006, 02:16PM
Location: Munich, Germany
Posts: 214

Bored Chemist wrote ...

Well, I guess if you got 2 of these pointing in oposite directions and counter rotating you might be able to use it provided that you didn't mind shooting the hell out of whatever's behind you and you had a really, really, big battery in your pocket.

Yeah, or simply use rockets.

Effilcdar

Sun Apr 22 2007, 05:30AM

Registered Member #655 Joined: Wed Apr 18 2007, 10:23AM
Location:
Posts: 14

What I want to see is the brute of a machine gun operator trying to change the angle of the MASSIVE GYROSCOPE in time to shoot somthing. It would also be funny to see how well the humvee turns with high speed gyros in the back of it. Also the power could be made with an electric motor, take a look at tesla motors main motor, its almost powerfull enough and only the size of a watermellon.

Electroholic

Sun Apr 22 2007, 07:35AM

Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720

the gyro is spinning on the same plane as the ground...
even so, you can totally aim it at any direction, think cross product of vectors*

mechanicalbull

Thu Apr 03 2008, 08:35AM

Registered Member #1420 Joined: Thu Apr 03 2008, 05:11AM
Location: portage, indiana usa
Posts: 4

i don't think it's bs, right now i am working on my own design that will fire air soft plastic 6 mm b-b's and my unit will fire at 300 feet per second at full auto not bad i do say, for a toy! its all in the design phase auto-desk inventor files, spreadsheets and i just started machining the acceleration chamber today. i cant wait to cut card board boxes in half lol.

Weston

Thu Apr 03 2008, 07:34PM

Registered Member #1316 Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365

Mythbusters built a device very similar to this to shoot tennis balls. It could dent steel plating. The had a lot of misfires though.

Barry

Fri Apr 04 2008, 02:35PM

Registered Member #90 Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301

So it replaces dangerous explosives with a dangerous explosive centrifugal chamber. They will rename it the centrifugal hand grenade when the containment system fails.

Accuracy? Man I love the picture of those round golf balls it shoots. Since there is no rifling to spin stabilize the round, the ammo's path will wander like an old slingshot or musket or paintball.

Are you absolutely sure the announcement wasn't an April Fool's joke?

Backyard Skunkworks

Sat Apr 05 2008, 06:33AM

Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451

Weston wrote ...

Mythbusters built a device very similar to this to shoot tennis balls. It could dent steel plating. The had a lot of misfires though.

If your talking about the civil war steam gun episode then that was not tennis balls. That was .50 caliber steel balls. They powered that thing with a couple modded hot water heaters running some type of compressed air motor at a few hundred RPM, their major problem was timing! The steel ball would always drop at the wrong moment, causing the gun to fire in any direction.

Funny thing is I built something pretty similar when I was about 10, I hooked an RC car motor up to two touching wheels and got them going at a couple thousand RPM, I would then feed projectiles into them and they would launch at maybe 40ft/sec. I got this idea from a pitching machine.

Even funnier I was just thinking of replicating this with a couple vacuum cleaner motors driving anything that wont fly apart at tens of thousands of RPM. I calculated I might get a velocity about half that of modern handgun rounds if I can get the wheels to 60krpm

I doubt applying this will be at all easy though.

mechanicalbull

Sun Apr 06 2008, 10:37AM

Registered Member #1420 Joined: Thu Apr 03 2008, 05:11AM
Location: portage, indiana usa
Posts: 4

i really don't know how the dread system works but my guess is the ammo is loaded coaxially (center of rotating shaft) and as the rotor turns the ball receives angular acceleration as it moves to it's maximum radius at a given rpm which is constant. then it leaves the chamber vary fast under rectilinear motion. i am designing a gun myself kind of a toy not much more.

here are some numbers for the unit i am building: my rotor turns at 22,894 rev/min then divide by 60 is 381 rev/sec and with a 3 inch diameter rotor will yield (pie*(3/12)*381)=299 feet/sec. now the kinetic energy the projectile will deliver to the target would be KE = 1/2mv^2 =.5*.0002kg*(.3048 ft/m*299 ft)^2=.8305 newtons, converted to English units it would be .6125 foot*pound-force. now that dose not look like much, however it is when we look at the psi it is 14.2 lb/in^2 (force per square units=force/area) if anyone can let me know if the last part is correct please let me know, i think there is unit conversation issue here. i will post my progress on this gun as the week/months go by.

ps the ammo is 6 mm in diameter and has a mass of .2 grams.

Backyard Skunkworks

Sun Apr 06 2008, 07:35PM

Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451

mechanicalbull, both your kinetic energy calculation and energy conversion seem to be fine. 0.2 grams just isn't a very heavy projectile, even at high speed it's gonna have low energy.

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