Posts Tagged‘atlas’

The Human Powered Helicopter.

We humans aren’t great power sources, despite what The Matrix might have you believe, with our sustained output being roughly equivalent to about one quarter of a horsepower (maybe half if you’re an endurance runner or cyclist). This works pretty well for our natural form of locomotion as we don’t need that much to move ourselves around but it becomes something of an issue when we start using more exotic forms of transportation. Cycling and rowing can be fairly efficient forms of transportation when all you have is human power however once you want to take to the skies things start to get a little hairy as the power required for sustained flight is usually well above what your typical human can provide.

That’s not to say we haven’t tried, far from it. Attempts to create a purely human powered craft go as far back as 1923, a mere 20 years after the first powered, heavier than air flight took place at Kitty Hawk. Most of these experiments could only be considered experimental in nature as the distances they could cover were rarely more than a few meters and most of them required a powered assist in order to take off, thereby invalidating them as being truly human powered. The late 1970s however saw the creation of the Gossamer Condor and Albatross, both fully human powered craft that took the Kremer Prize. However probably the most famous of all the human powered craft comes in the form of the MIT’s Daedalus a human powered craft that flew from the Isle of Crete to Santorini, a distance of 115KMs that was completed in just under 4 hours.

You’d then think that a human powered helicopter wouldn’t be too far behind however the design principles behind a helicopter present a much larger challenge than those of a traditional aeroplane. Instead of pushing the aerofoil via the use of a propeller to generate lift a helicopter instead whips the aerofoil itself through the air. This, traditionally, requires a lot more effort in order to generate the same amount of lift and the tricks used for the current generation of human powered craft (light materials and giant wings) present even greater challenges when those wings need to be under rotational stress. We do have several decades of aeronautical engineering advances since then however and one team has finally managed to create a human powered helicopter, one that can fly for just over a minute:

It’s an incredible device sporting 4 rotors that each have a diameter of 20m, each of which is larger than the individual rotors of the mighty Boeing Chinook. That incredible size is also coupled with a weight that seems almost impossible for a craft of that size, weighing in at a paltry 55kg. One thing to note however is that whilst this does count as a human powered helicopter the height it attained, some 3 meters or so, means that this craft was still operating well within the ground effect which means that it’s effectively working with a much better lift profile than would be expected once it reached a higher altitude. Some would then not classify this as a helicopter and instead call it a ground effect craft, which I’d agree with in some sense, but it’s still a pretty amazing feat of engineering despite the fact that it hasn’t left ground effect yet.

It’s really quite amazing to see how a combination of engineering and human power can create things like this which were the stuff of fantasy not too long ago. Sure it might not have any practical uses right now but the technology they developed will definitely flow down to other lightweight craft, further improving their flight capabilities and characteristics. We might never all have our own pedal powered aircraft but it still remains a valuable engineering challenge, much like the solar car races held here in Australia. I can’t wait to see what they develop next as there’s already been implementations of other exotic aircraft like the human powered ornithopter so others can’t be that far behind.

The Higgs is Here, The Higgs is Here!

You know what I most enjoy about science? The ever changing, always raging debate about how our models can be improved beyond what we currently have. Our scientific history is filled with models that made sense at the time with the knowledge we had then, only to be torn asunder by some new finding that forces us to rethink the way in which we modelled the observable universe before us. What I find most exciting are the times when we’re wrong as one experiment going completely awry can provide the required insight to shift our perspective considerably. Equally as exciting though is the prospect that we’ve modelled something almost perfectly and our experimental evidence confirms it.

Today we witness the latter with the Large Hadron Collider announcing that they’ve discovered a new particle and it looks suspiciously like the Higgs Boson:

“We observe in our data clear signs of a new particle, at the level of 5 sigma, in the mass region around 126 GeV. The outstanding performance of the LHC and ATLAS and the huge efforts of many people have brought us to this exciting stage,” said ATLAS experiment spokesperson Fabiola Gianotti, “but a little more time is needed to prepare these results for publication.”

“The results are preliminary but the 5 sigma signal at around 125 GeV we’re seeing is dramatic. This is indeed a new particle. We know it must be a boson and it’s the heaviest boson ever found,” said CMS experiment spokesperson Joe Incandela. “The implications are very significant and it is precisely for this reason that we must be extremely diligent in all of our studies and cross-checks.”

If you’re scratching your head as to why this discovery is so significant here’s a run down on what the Higgs Boson is in terms of the standard model of particle physics:

For the TLDR crowd the discovery of the Higgs Boson would fit our current model for understanding why particles have mass. Should the Higgs Boson not exist then our current understanding would be invalidated and we’d have to start testing other theories so our model could be made more accurate. For the most part there’s overwhelming evidence to support the standard model thanks to the previous work of other particle accelerators but the Higgs Boson represents the keystone of the whole model. Without it the rest of it needs a whole lot more explanation in order to make it work effectively.

Now whilst this is being lauded as the discovery of the Higgs Boson, and in all likelihood it is, there’s a non-zero chance that the CMS and ATLAS detectors at CERN have actually discovered another new particle that isn’t the Higgs Boson. That would be extremely interesting in and of itself as it would mean that the Higgs Boson, if it exists at all, would more than likely be at some mas even higher than first predicted. From what I can remember the current mass of the Higgs was on the upper limit of the LHC’s capabilities so if this turns out to be some kind of other particle, one that doesn’t exclude the Higgs from existing, we’d probably need to construct another particle accelerator in order to be able to detect it. That or the LHC would need to be upgraded which I admit is far more likely.

Regardless of the true nature of this new particle its discovery is something to get excited about as no matter what it is it means big things for the world of particle physics. The findings won’t see radical technology change or anything like that but it does mean we’re honing in on some of the fundamental aspects of our universe, something which I find incredibly thrilling. The next few months of data verification and probing the properties of this new particle will be a very interesting time and I can’t wait to hear more about this new boson.