top Radical Dual Tilting Blade Helicopter Design Targets Speeds of Over 270mph
There are 3 other entries in this competition:
http://en.wikipedia.org/wiki/Future_Vertical_Lift#Competitors, two of which are tiltrotors.
Bell Helicopter's entry into this competition is more of an incremental upgrade to their V-22 tiltrotor technology: http://bellv280.com/ The Army also wants something smaller than the V-22 (the V280 will end up being probably 1/3 to 1/2 the size) and it will presumably be correspondingly cheaper per aircraft. (Of course with the way these programs usually turn out, who knows how much budget overrun it'll see...)
Karem Aircraft is also proposing a tiltrotor, and is partnering with Lockheed, though I don't think either has experience with tiltrotors.
Sikorsky and Boeing teamed up to build an upgraded version of the X2.
Interestingly, AVX also has a lot of former V-22 engineers and management working for them, so they may have had their reasons for opting against a tiltrotor arrangement, such as a simpler drive and control system.
Personally though, I'd bet that either the Bell or Sikorsky/Boeing proposal will get selected, simply because they've had experience with comparable aircraft, which will give them a better handle on the estimated performance, rather than just making paper helicopters. They're also the big names in US military rotorcraft, and currently have the facilities to ramp up to that kind of production (4000 helicopters is a helluva lot of aircraft).
top Sagita Displays Hot Air Powered Helicopter
Coaxial helicopters still have a tail due to the controls on the empennage. Helicopters are a bit odd in that the pilot is basically flying the rotor disk, and the fuselage is kinda just "along for the ride". So, if you wanted to rotate or adjust the pitch of the fuselage, you'd need some sort of controls on the fuselage to do so. (Some adjustment can be made with the rotors, but the standard tail controls are a bit simpler.) So, while coaxial helicopters are more inherently stable and don't need a tail rotor, they'll still have a tail. (See the
Ka-50, X2 and Ka-27 among others, as examples.)
The reason you want controls at the aft end of the the tail is because for things like the elevator, you want as big a moment arm as possible to reduce the force required to adjust the pitch of the aircraft. Similarly, the vertical stabilizers are there to help reduce sideslip at higher speed, since a helicopter can fly in any direction, regardless of the orientation of the fuselage. (Generally for lighter helicopters, the vertical stabilizers are fixed, though the larger ones can have a movable rudder.)
Additionally, having a tail will help you if you need to do an autorotation, as it will help prevent the rotors from impacting the ground at the rear when you flare it right before landing. (Here are some examples: http://www.youtube.com/watch?v=T-5ARzqF3R4)
Disclaimer: While I'm a helicopter engineer, I don't work on the controls, so this may be a bit of a simplistic explanation. :)
about a year and a half ago
top Edison Would Have Loved New Light Bulb Law, Says His Great-Grandson
You can already get around the restrictions if you want an old fashioned light bulb, they're just called
Heatballs instead. Two guys in Germany started marketing them as "heaters that fit into a light socket" last year after a similar law went through in the EU.
top NFL: National Football Luddites?
A system like this was proposed for the 2006 World Cup, but Adidas and FIFA opted not to use it because they found some issues with it.
I also heard somewhere that a few teams tried it in a few exhibition games (not sure if it was this same system), and the fans didn't like it because they couldn't argue with one another about whether someone actually scored or not! And since pro sports is just entertainment, you certainly don't want to alienate your fan base...
top UCLA Engineers Create Energy-Generating LCD Screen
Someone proposed this concept last year, but unfortunately I don't think anyone's actually selling it:
top Aerial Video Footage of New York Taken By RC Plane
According to this earlier
article, the police and TSA talked to him, but surprisingly didn't charge him with anything. He said they were "more curious than confrontational."
top GM Loses Money On Every Volt Built
Nope, but there *is* enough for a Christmas Tree.
top NASA's Stunning Close-Up Photos of Comet Hartley 2
You're probably just joking around, but there is at least one pretty advanced carbon-epoxy spacecraft, the
White Knight. Plus, there have been a couple of new American carbon-epoxy aircraft in production the past few years:
Bell-Boeing V-22 Osprey
Lockheed Martin F-22 Raptor
top Water Main Break Floods Dallas Data Center
the most devastated in just about any natural disaster
But it would be the most protected area during a tornado, which is the most common natural disaster in North Texas.
Battlefield Earth Screenwriter Accepts Razzie
Sounds like they took a page straight from
top When I die, I want my body to be ...
You can do both:
top Breaking the Squid Barrier
You could also keep it as a defense for your island fortress against James Bond a la Dr. No! (The novel, not the movie.)
top Skydiver To Break Sound Barrier During Free-Fall
My first thought was the Mobile Infantry from Starship Troopers (the book not the movie), even though he's jumping from a balloon, and not from orbit.
top Aussie Scientists Find Coconut-Carrying Octopus
There was an incident where an
octopus didn't like a light shining on him, and started shorting it out by climbing out of the tank and squirting it with water. I definitely wouldn't be surprised if one figured out how to get a little extra food.
top Great White Sharks Visiting San Francisco
Yep, there have been a number of biologists studying great whites for a few decades near the Farallon Islands off the coast of San Francisco. There's even a book,
The Devil's Teeth, detailing a shark season with the biologists.
top Why a High IQ Doesn't Mean You're Smart
A good book about actual millionaires in the US is
The Millionaire Next Door. It has some interesting trends (like millionaires are more likely to drive an F150 than a luxury car) and shows that most millionaires get there through hard work, investment, and most importantly, don't spend it on a bunch of crap they don't need. The American dream is still alive and well, but most people aren't willing to put in the time, elbow grease and self-restraint to actually get there.
top iRobot Introduces Morphing Blob Robot
If it gets much bigger, we'll have to call
Steve McQueen for help!
top French Deputies Moving Against Photoshopped Ads
That's one thing that has always bugged me. There's always a big commotion about anorexic models, but they don't consider that they are only a small percentage of population, with only
3% of the population having a binge eating disorder, and roughly of the population is overweight or obese. Don't get me wrong, anorexia is a serious medical condition and people need to be informed about it, but I think its been way over publicized because of all the celebrity gossip that's going around today, so people think it's more prevalent than it actually is.
top Dell Buying Perot Systems For $3.9 Billion
The whole story of Perot's rescue was documented in a book by Ken Follett called "On Wings of Eagles".
At one point, Perot actually flew in to Tehran pretending to be a courier for a news service so he could actually visit the two guys in jail. Pretty ballsy, and while there might be few executives who would organize a rescue attempt, he's probably the only one willing to do for their employees.
top Nissan Gives Electric Cars 'Blade Runner' Audio Effect
Well, I know I love the smell of ozone in the morning.
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