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johannessimon81

Google combines skycrane, VTOL and lifting wing to make drone deliveries - 6 views

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    Nice video featuring the technology. Plus it comes with a good soundtrack! Google's project wing uses a lifting wing concept (more fuel efficient than normal airplane layouts and MUCH more efficient than quadrocopters) but it equips the plane with engines strong enough to hover in a nose up position, allowing vertical landing and takeoff. For the delivery of packages the drone does not even need to land - it can lower them on a wire - much like the skycrane concept used to deliver the Curiosity rover on Mars. Not sure if the skycrane is really necessary but it is certainly cool. Anyways, the video is great for its soundtrack alone! ;-P
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    could we just use genetic algorithms to evolve these shapes and layouts? :P
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    > Not sure if the skycrane is really necessary but it is certainly cool. I think apart from coolness using a skycrane helps keep the rotating knives away from the recipient...
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    Honest question, are we ever going to see this in practice? I mean besides some niche application somewhere, isn't it fundamentally flawed or do I need to keep my window opened on the 3rd floor without a balcony when I ordered something from DX? Its pretty cool yes, but practical?
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    Package delivery is indeed more complicated than it may seem at first sight, although solutions are possible for instance by restricting delivery to distribution centers. What we really need of course is some really efficient and robust AI to navigate without any problems in urban areas : ) The hybrid is interesting since it combines the advantage of a Vertical Takeoff and Landing (and hover), and a wing for more efficient forward flight. Challenges lie in the control of the vehicle under any angle and all that this entails also for higher levels of control. Our lab has first used this concept a few years ago for the DARPA UAVforge challenge, and we had two hybrids in our entry last year for the IMAV 2013 (for some shaky images: https://www.youtube.com/watch?v=Z7XgRK7pMoU ).
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    Fair enough, but even if you consider advanced/robust/efficient AI, why would you use a drone? Do we envision hundreds of drones above our heads in the street instead of UPS vans, or postmen, considering delivers letters might be more easily achievable. I am not so sure if personal delivery will take this route. On the other hand, if the system would work smoothly, I can image that I'm send a mail with the question whether I'm home (or they might know already from my personal GPS tracker) and then notify me that they are launching my DVD and it will come crashing into my door in 5min.
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    I'm more curios how they're planning to keep people from stealing the drones. I could do with a drone army myself and having cheap amazon or google drones flying about sounds like a decent source.
pacome delva

Physics - Fruit flies swim through air - 1 views

  • A new experiment reported in Physical Review Letters shows that—contrary to popular wisdom—paddling can be as effective in air as it is in water. This could imply that insects evolved their flight capability from some earlier swimming trait.
  • Using high-speed video cameras to track wing motion, the team observed certain cases where the flies paddled their wings forward and backward. To confirm that this was indeed drag-based motion, the team plugged their wing data into an “insect flight simulator” and found that they could reproduce the fly’s overall movement. The authors constructed a simple model of paddling, which seems to support the theory that insect wings evolved in water.
Guido de Croon

Nano flapping wing MAV by Aerovironment (DARPA-funded) - 6 views

A 7.5 inch, 19 gram flapping wing MAV with camera! It uses active stabilization since it has single wings and no tail. http://www.avinc.com/nano http://www.latimes.com/business/la-fi-hummingbird-...

ai

started by Guido de Croon on 18 Feb 11 no follow-up yet
LeopoldS

ScienceDirect - Optics Communications : Replication of homologous optical and hydrophob... - 2 views

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    remember by comment on the butterfly wings during the brainstrormgame ?
ESA ACT

Aerodynamic characteristics of dragonfly wing sections compared with technical aerofoil... - 0 views

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    The dragonfly wings as discussed during the Bremen KO meeting. There should also be some cool videos and CFD stuff visualizing how this actually works.
Marcus Maertens

Reducing the contact time of a bouncing drop : Nature : Nature Publishing Group - 2 views

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    The reason why butterflies do not get wet wings.
Christos Ampatzis

Butterflies in the ISS - 5 views

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    learning to flap wings without gravity
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    is there something more than a video where nothing happens...?
pacome delva

Fruit Fly Aerial Maneuver Explained - 1 views

  • Insects can execute flying feats more impressive than fighter jets, and a team of researchers has now learned the trick behind one of them. They used high speed video cameras and a new 3D reconstruction technique to show how fruit flies execute their acrobatic turns. As they report in the 9 April Physical Review Letters, despite the complex wing motions, a fly can execute quick pirouettes by adjusting just a single parameter that controls the difference between the way its left and right wings oscillate. The results may be relevant for engineers designing flight control strategies for tiny robotic insects for search-and-rescue and surveillance.
ESA ACT

nature01941.pdf (application/pdf Object) - 0 views

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    A number of biological models with interesting photonic properties are reviewed, such as butterfly wings or moth eyes.
ESA ACT

Soaring Over the Alps on Homemade Jet Wings | Autopia from Wired.com - 0 views

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    crazy swiss ....
Luzi Bergamin

First circuit breaker for high voltage direct current - 2 views

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    Doesn't really sound sexy, but this is of utmost importance for next generation grids for renewable energy.
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    I agree on the significance indeed - a small boost also for my favourite Desertec project ... Though their language is a bit too "grandiose": "ABB has successfully designed and developed a hybrid DC breaker after years of research, functional testing and simulation in the R&D laboratories. This breaker is a breakthrough that solves a technical challenge that has been unresolved for over a hundred years and was perhaps one the main influencers in the 'war of currents' outcome. The 'hybrid' breaker combines mechanical and power electronics switching that enables it to interrupt power flows equivalent to the output of a nuclear power station within 5 milliseconds - that's as fast as a honey bee takes per flap of its wing - and more than 30 times faster than the reaction time of an Olympic 100-meter medalist to react to the starter's gun! But its not just about speed. The challenge was to do it 'ultra-fast' with minimal operational losses and this has been achieved by combining advanced ultrafast mechanical actuators with our inhouse semiconductor IGBT valve technologies or power electronics (watch video: Hybrid HVDC Breaker - How does it work). In terms of significance, this breaker is a 'game changer'. It removes a significant stumbling block in the development of HVDC transmission grids where planning can start now. These grids will enable interconnection and load balancing between HVDC power superhighways integrating renewables and transporting bulk power across long distances with minimal losses. DC grids will enable sharing of resources like lines and converter stations that provides reliability and redundancy in a power network in an economically viable manner with minimal losses. ABB's new Hybrid HVDC breaker, in simple terms will enable the transmission system to maintain power flow even if there is a fault on one of the lines. This is a major achievement for the global R&D team in ABB who have worked for years on the challeng
Wiktor Piotrowski

How To Build Your Own Cockroach Cyborg | Popular Science - 1 views

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    bio-robotics anybody?
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    WIRING Poke the left silver wire about one millimeter into the roach's thorax, under a wing just behind its head, and secure it with superglue. Cut each antenna to expose a neuron-lined tube. Insert the middle wire one millimeter into the left tube, and the right wire into the right tube. Superglue both wires into place. CONNECT AND COMMAND Hot-glue the circuit board onto the roach's back and plug it into the head connector. After the roach wakes up, press the remote's left button to urge it right, and the right button to move it left. The cyborg will ignore commands after a few minutes. Peel off the circuit board and clip all wires to ensure a long retirement.
Luke O'Connor

Mexican jumping beans may influence robot design - 0 views

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    The way that Mexican jumping beans move by detecting temperature gradients could be applied to designing robotic beans. Most animals move around by using their appendages, such as legs, wings, or fins. But a few exceptional creatures employ rolling as a mode of locomotion.
Tom Gheysens

Biomimicr-E: Nature-Inspired Energy Systems | AAAS - 4 views

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    some biomimicry used in energy systems... maybe it sparks some ideas
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    not much new that has not been shared here before ... BUT: we have done relativley little on any of them. for good reasons?? don't know - maybe time to look into some of these again more closely Energy Efficiency( Termite mounds inspired regulated airflow for temperature control of large structures, preventing wasteful air conditioning and saving 10% energy.[1] Whale fins shapes informed the design of new-age wind turbine blades, with bumps/tubercles reducing drag by 30% and boosting power by 20%.[2][3][4] Stingray motion has motivated studies on this type of low-effort flapping glide, which takes advantage of the leading edge vortex, for new-age underwater robots and submarines.[5][6] Studies of microstructures found on shark skin that decrease drag and prevent accumulation of algae, barnacles, and mussels attached to their body have led to "anti-biofouling" technologies meant to address the 15% of marine vessel fuel use due to drag.[7][8][9][10] Energy Generation( Passive heliotropism exhibited by sunflowers has inspired research on a liquid crystalline elastomer and carbon nanotube system that improves the efficiency of solar panels by 10%, without using GPS and active repositioning panels to track the sun.[11][12][13] Mimicking the fluid dynamics principles utilized by schools of fish could help to optimize the arrangement of individual wind turbines in wind farms.[14] The nanoscale anti-reflection structures found on certain butterfly wings has led to a model to effectively harness solar energy.[15][16][17] Energy Storage( Inspired by the sunlight-to-energy conversion in plants, researchers are utilizing a protein in spinach to create a sort of photovoltaic cell that generates hydrogen from water (i.e. hydrogen fuel cell).[18][19] Utilizing a property of genetically-engineered viruses, specifically their ability to recognize and bind to certain materials (carbon nanotubes in this case), researchers have developed virus-based "scaffolds" that
H H

Physics Limericks - 0 views

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    Always check your units! Your units are wrong! cried the teacher. Your church weighs six joules - what a feature! And the people inside Are four hours wide, And eight gauss away from the preacher! How Fermi could estimate things! Like the well-known Olympic ten rings, And the one-hundred states, And weeks with ten dates, And birds that all fly with one... wings. For things moving free or at rest, Observe what the first law does best. It defines a key frame, Inertial by name, Where the second law then is expressed.
Tom Gheysens

Four-winged robot flies like a jellyfish - tech - 25 November 2013 - New Scientist - 2 views

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    This sort of reminds me of that Festo robot thing. Except this one was more of a baloon type model: http://www.youtube.com/watch?v=OxVf9QY_TFs
Guido de Croon

Robot dragonfly DelFly Explorer avoids obstacles by itself - 1 views

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    TU Delft researchers have developed the DelFly Explorer, the world's first Micro Air Vehicle with flapping wings that can avoid obstacles by itself. The uniqueness of this achievement lies in the DelFly Explorer's very low weight (20 grams, i.e. a few sheets of paper), and this opens up new possible applications for both smaller and larger MAVs.
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    I'm kinda curious what you used for processing power there. Is that a DSP?
pacome delva

An evil atmosphere is forming around geoengineering - 0 views

  • A number of right-wing think tanks actively denying climate change are also promoting geoengineering, an irony that seems to escape them.
  • Wood believes that climate engineering is inevitable. In a statement that could serve as Earth's epitaph, he declared: "We've engineered every other environment we live in, why not the planet?"
  • It's estimated that if whoever controls the scheme decided to stop, the greenhouse gases that would have built up could cause warming to rebound at a rate 10 to 20 times that of the recent past - a phenomenon referred to, apparently without irony, as the "termination problem".
Joris _

Airbus Concept Has Weird Wings, Morphing Seats | Autopia | Wired.com - 6 views

  • it reflects what experts in aircraft materials, aerodynamics, cabin design and engines came up with after considering what air transport might look like in 2050
  • Seems safe to say there are some within Airbus who truly are allowed to imagine something beyond normal aircraft interiors.
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    what a ACT's exercise should look like...
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    honestly, if this is all they can imagine for 2050 then this is quite boring .... "Here we are stretching our imagination and thinking beyond our usual boundaries," they are probably not having enough of imagination yet ....
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    Maybe, you should propose this exercise to the team. You'll see there is not much imagination, unless, you consider imagination equals craziness (bullshit things ... and the too common blah blah in the act). I think this concept is an imaginative credible concept. "anything we might ever see" explains it well.
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    well, the article is not very detailed so it can be only "du vent" ! did they actually try if such an airplane can fly ??? what about the engine ??? i find the solar impulse (see post below) much more eco-friendly !!! I agree with Leopold that it's quite boring and stays in the mainstream of the production. I'm sure we can do much better !!! What about some really useful things like pills against the flight sickness, and some really good food in the plane ? haha not soon to happen with all the cost reduction. The future of air transport will be a plane without seats, stewards and perhaps even without pilot !!!
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