That Dread thing has been kicking around for a long time. The video shows computer graphic representations of what it is supposed to do with cheesy explosions and animations. It also shows brief footage of a (likely scaled down) prototype shooting three horrible shotgun patterns on paper about 3:51 into the video that get progressively looser. They claim noiseless but you can clearly hear noise in it. They should put in on Penn & Teller’s Bullship! At least Metal Storm doesn't make physically impossible claims even though its impractical.
I’m going to throw out some numbers, obtained in SI but converted to units familiar to most of you here. I haven’t done physics in a long time so I probably made an incorrect assumption or forgot to "carry the 1" somewhere so if anyone cares to check mathematics on a Saturday night for me
Imagine a gun with no recoil, no sound, no heat, no gunpowder, no visible firing signature (muzzle flash), and no stoppages or jams of any kind
Even if it becomes necessary to increase the DREAD's magazine capacity to upwards of 100,000 rounds (.308 Cal.) or 20,0000 rounds (.50 Cal.), and run the weapon all day and all night for weeks on end, this will have absolutely no effect whatsoever (positive or negative) on the reliability or durability of the weapon system.
The DREAD is both heatless and frictionless, and doesn’t generate any high pressures. So, there’s virtually no wear and tear on the system, no matter how many rounds are fired through it back-to-back, even if it's run constantly on full-auto at 120,000 rpm, the whole time.
First three claims break the laws of physics. You can cheat recoil using various dampening methods or using a recoilless rifle design (ie not restricting gas expansion) but saying no recoil period is unfounded. Heat is produced with any type of friction so unless you're operating in the deepest vacuum of space (and there is still friction) or you’ve got a jar of superfluidic Helium-3 at a few billionths of a degree above absolute zero, no dice.
No sound? We must be led to believe the drum spins using some sort of soundless electric motor and that all that ammunition that needs to be accelerated in this spinning device won't make a sound. The thing appears to use angular momentum to fling BB's out so with the firing of these BB's, there will be a reduction in rotational speed of the drum due to ejected mass (the projectiles), or you will greatly increase the loading on the motor to the point of overheating. When you start making claims that it can fire at 120,000rpm, any reasonable motor (in a supposedly man-portable device) cannot keep up with that demand. Imagine the power source it needs.
For the sake of argument, these BB's are .30 diameter of generic steel. It’ll give us an approximate mass of 74 grains each knowing the volume. Since they’re dimpled, we can call it an even 70 grains. 2000 rounds fired over one second at 120,000rpm (rounds per minute, not rotations), that’s a mass of 21.1 pounds of ammunition fired per second, or .63 tons per minute. You need an innovative hopper design to feed that much spherical ammunition single-file, without jamming. The cited velocity is 8000fps in open air with no chemical propellant, which is an incredible 1.5miles per second. Lets make a kinetic energy comparison:
A 147-grain 7.62mm NATO at 2700fps has 3225 Joules of energy
A 70 grain dimpled steel BB traveling at 8000 fps has 13481 Joules of energy
While it weighs less, the BB is traveling much faster and has over 4 times the energy than a .308. The formula used to obtain energy is KE=. 5mv^2 where m is mass and v is velocity. Velocity is squared while mass is always one half the value. One can see you can get energy much faster by increasing velocity. By using half the weight, but about 2.5x the velocity, we more than quadruple the energy.
13500J of kinetic energy is a LOT, right under the .50 BMG in terms of muzzle energy. Over a period of one second, it will deliver 27MJ, or 27 million joules of energy, enough to keep a 60W light bulb lit for 314 days nonstop. I find it impossible to believe all this delivered energy will cause NO HEAT unless it took place in BizzaroWorld.
A-10 Thunderbolt pilots will tell you that when they fire that GAU-8, their plane physically slows down from the cumulative recoil force from firing the monster. It’s documented by first hand experience, and can be retold with simple physics.
We can get the force produced by measuring impulse over time. We’ll get 84 lbf.ft/s, which is force in pounds. The force we get over a period of 1 second at maximum feed rate, which is 2000 rounds a second, is consequently 168000 pounds, or 84 tons of counteractive force needed per second. The motor will need 84 tons of force to counteract the recoil force of the projectiles on the spinning drum. That’s just to BREAK EVEN. It needs significantly more to spin at who-knows-how-many-rotations-per-minute to fling BBs out at 1.5 miles a second.
Granted, this is an angular momentum problem and we don’t know the diameter of the “drum” that spools up the rounds. However, you can be damn sure your ceiling fan’s electric motor isn’t going to be able to keep up with this. I can’t imagine any reasonably man-portable electric motor that can exert that force. Even if you can, think of how much power it needs to consume.
27MJ per second of kinetic energy impacted on the projectile. Assume the device is (impossibly) 100% efficient in energy transfer; we need to flow 27MJ/s to the magically compact electric motor which will transfer to the projectiles at a 100% magical efficiency rate. A watt is measured in joules/second. Simply put, it’ll take 27megawatts from a generator or battery bank to power this thing. To get an idea of that, an 800 cold-cranking amps battery operating at 12V will put out 9.6kW peak. We need 2813 batteries to get equivalent energy consumption. A 800 cold cranking amps rated battery will operate at 800 amps for a handfull of secnods before it’s dead.
Also, in the real world, electric motors aren’t 100% efficient. Operating at a higher voltage to minimize resistive losses, lets say the motor they use is 90% efficient. The remaining 10% has to be dissipated as waste heat. 10% of 27MJ is 2.7MJ. 2.7 MJ of heat has to be dissipated per second to keep the motor at a stable temperature. You can provide a constant flow of 2.3 gallons of water at room temperature, per second over the motor, and it will come out the other side boiling. Consider energy and heat from a 60W bulb operating continuously for a little bit more than a month, but condensed into a seconds’ time.
We can also address the issue of aiming the device. A spinning drum with the incredible features mentioned above will have gyroscopic inertia. Everyone here has played with gyroscopes before. Now imagine the energy required to tilt a device like that above given all the energy figures.
A high school physics teacher could pick apart all the either inaccurate numbers, or impossible claims