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'Impossible' EM drive may actually be impossible after all
If something sounds too good to be true then it probably is, so goes the old saying. And unfortunately, it now seems this is also applicable to the "impossible" EM drive, first touted over a decade ago as a way to generate thrust using microwaves, thereby eliminating the need for fuel in deep space exploration. The initial research caused huge excitement, with scientists venturing it would be possible to travel from Earth to Mars in just a few weeks if the technology could be scaled up, but new tests suggest that's unlikely to happen because it doesn't appear to work at all.
NASA successfully tests microwave thruster, paving the way for speedier space travel
As with airplanes and many other self-powered machines, the fuel a shuttle engine requires can weigh nearly as much as the object it's propelling, increasing costs while significantly limiting range. It's a challenge we're going to need to overcome before launching long-distance treks through space, where carrying enough fuel may not currently be possible. One proposed method for getting future spacecrafts to their destinations is by utilizing a device called a microwave thruster. A British scientist named Roger Shawyer managed to build a similar engine called an EmDrive several years ago, and while a Chinese team also accomplished the same, the rest of the world hasn't paid much attention until NASA confirmed from its own research that such a device could work during a presentation earlier this week.
Bloodhound SuperSonic Car test-fires its engines, roasts the lab wall (video)
The land-speed record has been in British hands since 1983, but it's never been the motherland's habit to rest on its laurels. Yesterday, in a bomb-proof shelter in Cornwall, the team behind the Bloodhound SSC test-fired its rocket system for the first time, producing a staggering 14,000 pounds of thrust thanks to its liquid peroxide and solid synthetic rubber hybrid engine. Pumping that mix through the V8 of a Formula One car, the team hopes to reach a top seed of 1,050 mph (Mach 1.4), well beyond the 763 mph achieved by ThrustSSD back in 1997. After the break, we've got a short clip of the firing as it happened, which, frankly, makes the Batmobile's flaming jet engine look a little bit mediocre by comparison.
MIT 'microthrusters' are the size of a penny, could reposition tiny satellites
Bus-sized satellites require massive engines for even the slightest movements, but as far smaller structures become a possibility, a tiny driving mechanism can offer usable thrust. To serve this next-gen tech, MIT saw a need to develop "microthrusters," which are each the size of a penny and can be mounted to tiny cubed satellites. With thruster components measuring a few microns each, the magnetic levitation system is able to accommodate 500 microscopic tips that emit ion beams in a very small package, serving to push two-pound structures through space. The tiny devices have not made their way into orbit yet, but they have been tested in a vacuum chamber. Because of their size, it's possible to add several to each satellite, then enabling sophisticated movements for more precise turns. There are currently two dozen "CubeSats" in orbit, each measuring only slightly larger than a Rubik's cube, but without any thrusters to power them, positioning can't be adjusted once they're released. Because of their current location, CubeSats eventually burn up in the atmosphere, but once they're released farther from Earth, they won't be able to enter the atmosphere on their own, remaining in orbit as "space junk" even after completing their missions -- micro thrusters could also serve to move these satellites closer to the planet so they can burn up during re-entry. There's no word on when, or even if, MIT's invention will make its way to the launchpad, but you can take a closer look in the demo video after the break.
IKAROS gets first burst of solar propulsion, wants more
Photons, man, it's all about the photons. Japan's solar sail-equipped IKAROS probe has recorded its first propulsion derived from the force of sunlight rays hitting its tender surface. The force generated is a truly minuscule 1.12 millinewtons, but that can go a long way (literally) in a frictionless environment like space. The kite's sails also soak up Sol's emitted light to generate electricity, making the most out of the one resource available to it. So now that we've figured out how to do all that, shall we get started on colonizing Mars or what?
The Care and Feeding of Warriors: Show your expertise
This week, The Care and Feeding of Warriors talks about Expertise. There's going to be a lot of math talk. It will probably have an error or two in it. Mr. Rossi needs to get some int gear for writing these columns. Expertise is useful for tanking and melee DPSing, so it seemed time to discuss it. Also, I've recently realized I can't actually hit the 'expertise cap' as a tank with the gear I can get. Sad but true.We live in interesting times since patch 2.3 here in warrior land. Whereas previous to this patch, we had good old fashioned bonuses to our weapon skill (remember the old Edgemaster's Handguards? Admit it, you wore these at 60. Some of you wore them at 70. You don't have to lie to us, we know.) we now live in the magical world of expertise rating and expertise. What is expertise, and what isn't it?Well, for starters, expertise is not chance to hit. Expertise can help you hit more often in an indirect manner... it reduces the chance for a mob to dodge or parry your attacks. so technically yes you'll be hitting them more often. But + hit items directly reduce the chance an attack will miss, which in World of Warcraft is entirely different from a dodge or parry (just ask any warrior trying to hit the Overpower button). Furthermore, expertise is not weapon skill. The expertise system replaced bonuses to weapon skill on items, but it did not actually replace weapon skill: weapon skill up to 350 (at level 70) still exists. Expertise is just (just, he says) a direct reduction of your chance to have your attacks dodged or parried. Unlike the old days with weapon skill bonuses, as far as I know there's no relationship between expertise and glancing blows. (If anyone out there has information that contradicts me here, please share it.) So if expertise isn't going to raise your chance to hit, why am I so excited about it?
Bae Institute crafts magical photonic laser thruster
Now that humans have shot themselves up into space, frolicked on the moon, and have their own space station just chillin' in the middle of the galaxy, what's really left to accomplish out there? How about cruising around at light speed? Apparently, a boastful group of scientists at the Bae Institute in Southern California feel that they're one step closer to achieving the impossible, as the "world's first photonic laser thruster" was purportedly demonstrated. Using a photonic laser and a sophisticated photon beam amplification system, Dr. Bae reportedly "demonstrated that photonic energy could generate amplified thrust between two spacecraft by bouncing photons many thousands of times between them." The Photonic Laser Thruster (PLT) was constructed with off-the-shelf parts and a bit of fairy dust, and it's said that this invention could eliminate the need for "other propellants" on a wide range of NASA spacecrafts, theoretically savings millions on energy costs and enabling longer missions. So while this may be an incredibly novel idea, the chances of this actually working outside of a laboratory seem relatively small, and make sure we're not the guinea pigs strapped into the first craft that utilizes this mystical method of launching, cool?[Via Wired]
