Several news sources, apparently using the same press release from Mitsubishi Chemical Corp., have announced a spray-on solar cell, which can be applied in the same fashion as paint – to “buildings, vehicles and even clothing.” This “means that the places where energy from the sun can be harvested are almost limitless.” Less than one millimeter thick and capable of 10.1-percent efficiency, the new material is said to have a weight one-tenth of traditional silicon cells. Mitsubishi says these are prototype materials, and that they hope to achieve 15-percent efficiency by 2015, with 20 percent as a more distant possibility. Mitsubishi is a bit soft on details, but says, “The new solar cells utilize carbon compounds which, when dried and solidified, act as semiconductors and generate electricity in reaction to being exposed to light. Most existing solar cell technology requires crystalline silicon to be sandwiched between glass sheets and positioned on the roofs of homes and office buildings, or in space-consuming …
Albatross, Dragonflies, and Hummingbirds
Your editor took a trip to Tehachapi, once home of the infamous California Women’s’ Correctional Institution, mentioned in no less than three 1940’s films noirs. (It’s now a gray-bar hotel for bad boys, not bad girls.) Lesser offenses were in mind, though, since Labor Day weekend has been the time for 31 meetings of the Experimental Soaring Association’s Western Workshop. The group, devoted to improving sailplanes and testing the limits of soaring technology, has been in the forefront of many significant developments, and its members include many record holders and aerodynamics experts. This year’s convocation included talks on birds, dragonflies (the Libelle sailplane), and even a demonstration of Aerovironment’s spy hummingbird, a camera-toting drone no larger than a 90-percentile member of the Trochilidae family. Phil Barnes kicked off the Saturday talks, showing his incredible computer simulations of the dynamic soaring flight of the Albatross, which included an impassioned plea to help preserve this magnificent bird. He noted that “gyres” of plastic slurry distributed …
An Electric Helicopter Lifts Off – Briefly
Gizmag apparently beat everybody to this story, with even Popular Science quoting from the online gadget hunter’s web site. They report that in mid-August 2011, Pascal Chretien piloted his creation, a coaxial rotor, twin Lynch-motored helicopter that he built for Solution F, a Swiss racing engine development firm. He performed the flight “in the presence of a court appointed witness,” according to a press release from Lithium Balance, the firm that supplied the battery management system (BMS) for and acted as consultants to the project. The “first” Chretien claims is a carefully parsed one, an “untethered, fully electric manned helicopter flight in a prototype machine.” The fact that he designed and built a unique machine and flew it in a 12 month span makes the two minute, 10 second flight all the more remarkable. Solution F asked for a 10 to 12 minute flight, so more news will be coming, undoubtedly. As Lithium Balance notes, “With degrees in Electronics and …
Combining the Best of Batteries and Supercapacitors
The CAFE Blog has been tracking developments in batteries and supercapacitors for nearly the last two years, and the annual Electric Aircraft Symposia have attracted speakers on a wide range of innovations in these areas. Gizmag reminded us this week how much all of this may soon affect the ability of energy storage and power devices to change our world. Their report highlighted work on an energy storage system that combines the energy capacity of batteries with the power density and quick recharging capabilities of capacitors being done at Rice University, and linked that to research at the University of Illinois by Dr. Paul Braun on creating faster charging batteries with higher energy densities than currently possible. Gizmag then did a callback to something covered earlier by CAFE, the use of structural panels in electric vehicles as energy storage devices. Both researchers pointed to the big disappointment in electrical devices – batteries. They are either short-lived in their application or take …
Lifting Yourself by a Disappearing Thread
The University of Maryland announced the successful 11.4 second flight of an American human-powered helicopter with a female pilot – now the National record holder and successor to the first female flight on such a machine – 17 years ago. In 1994, your editor attended a human-powered aircraft symposium in Seattle at the Boeing Museum of Flight. Paul MacCready signed my copy of Gossamer Odyssey and I was official observer (for Chris Roper of the Royal Aeronautical Society) of the first female-powered helicopter flight. Ward Griffiths, a svelte young thing from a local bike shop, cranked the very similar (to Gamera) thing into the air for 8.6 seconds – a first and a female record at that time. A Japanese gentleman had done 15 seconds the day before and knocked the O. J. Simpson investigation off the front page of the Seattle Post-Intelligencer. Flights took place in the Boeing 777 preparation hangar, while the big jet spooled up and taxied around outside. …
Embry Riddle Begins GFC Test Flights
On August 23, 2011, the Embry Riddle Aeronautical University’s Green Flight Challenge hybrid-powered modified Stemme S10, the Eco-Eagle, began its ground tests on the Daytona Beach International taxiways, “Getting ATC used to us!” The next day saw several ground-skimming “flights,” starting at 2-feet, and rising to 10 and 50-feet high runs, all with the gear down. The day’s flights ended with a trip around the pattern for the airport’s longest runway. August 25 saw a morning excursion of 45 minutes, with the airplane flying in the face of the approaching Hurricane Irene. Test pilot Mikhael Ponso reported beautiful clouds and no high winds during the seven laps around the field. As he tested the gear retraction and various flap settings, he was able to sort things out for the upcoming GFC flights in Santa Rosa, California during the last week in September. The school’s Eco-Eagle has a Rotax hybrid-power system originally developed for Flight Design, a German firm that builds …
Aero-PC and SolarWorld, Ford and SunPower Light Up Transportation
With electric aircraft showing the possibilities of a greener future, it’s rewarding to see similar efforts to produce cleaner, off-the-grid ground transportation. Calin Gologan had a gala week at AirVenture, speaking at the Electric Aircraft World Symposium to detail his Elektra One Green Flight Challenge entrant and to introduce his Elektra Two and Four two-seat and four-seat, respectively, electric aircraft. He was awarded the Lindbergh Electric Aircraft Prize (LEAP) for the quietest electric aircraft by Erik Lindbergh, Charles’ grandson. Saturday, July 30 saw Norbert Lorenzen, test pilot for PC-Aero and owner of a flight school near Landshut, Germany, take Elektra One for a spin around the Oshkosh airspace. Note Molt Taylor’s Aerocar zipping by between the 15 and 18 second marks on the video. On the ground, the airplane was dollied out for takeoff,“overseen” by the capable Howard Handelman, who also noted something that Gologan had confirmed to Brien Seeley, President of the CAFE Foundation. The SolarWorld solar cells on …
A Hybrid That Doubles Your Odds
Of at least making it home at night. Zero-Grid’s demonstrator looks like an electric green Zap! Zebra sedan from the outside, but houses a wealth of creative energy, along with interior-filling racks of batteries and an innovative charging and switching system. While “range anxiety” is still a concern for buyers of even high-end pure electric cars, this hybrid system promises a final electricity-driven sprint even when the fuel runs out. Using a “Battery Alternating Recharging Process” (BARP), Michael Hargett,the car’s inventor, says Zero-Grid’s Zero Kar™, with two or more individual battery packs and a hybrid generator, can recharge one battery pack while the other runs the car. By alternating power and charging among multiple battery packs, the car achieves high mileage even for a hybrid, showing over 131 miles per gallon on average, with one run producing over 141 mpg. It also has reasonable performance, topping 70 miles per hour: the original Zap! Car could only do about 45 mph …
Alternair, X-Caps™ Teaming Up From Sky to Parking Lot
Stephen Boutenko, founder of Alternair, LLC and Karl Young, founder of Extreme Capacitors have found common cause in analyzing how best to make an electric Light Sport Aircraft (LSA) a possibility. Alternair’s Amp LSA was featured in a blog entry last year, and Karl Young’s work with ultracapacitors was the subject of his presentation at this year’s Electric Aircraft Symposium. Alternair has recently established a temporary design department in Prescott, Arizona (in association with Embry Riddle Aeronautical University) and is moving his manufacturing facility to Ashland, Oregon, where he hopes to begin production of the highly-sophisticated Amp. Although Amp will be developed around existing lithium-polymer battery technology, Young reports that his creation of high power/high energy ultracapacitors has demonstrated, “Around 0.9 mega Joules (250 Watt-hours per kilogram) in the lab,” with a goal of, “5 mega Joules (1,400 Wh/kg) for sport aviation.” Funding will spur further progress. Young explains, “We’ve already found ways to improve our existing design,” and …
A Comparison Too Far
A recent entry comparing the German Carplane® and Burt Rutan’s BiPod has prompted a response from John Brown, who found the posting of concern for the misapprehensions it might cause in readers. He notes, for instance, “Your current article portrays us as a large Govt. Co. (we got a small subsidy) going up against a ‘charity’ organization (Northrop-Grumman’s subsidiary, Scaled Composites) in whose name the BiPod is registered at the FAA – as a glider; “It compares us to 1930s modular concepts where actually the BiPod’s wings are screw-on/screw-off ‘modular’ and use that older concept; “It attributes a commuter ‘pitch’ to us where, in fact, we’re not aiming for that market at all. [Thanks for your apology. However, the world is still quoting your article.] “It implies we somehow responded to Burt Rutan (we disclosed 2008 – via patent). We’ve displayed at the world’s largest Trade Fair & Europe’s largest GA show – not at a desert strip. We’ve published …