On Friday, December 3, Sonex Aircraft, LLC achieved a long-sought goal at Wittman Field, Oshkosh, Wisconsin, successfully flying their electric two-seater Waiex. Unveiling their craft at the 2007 AirVenture on the same field as part of their E-Flight Initiative, the team quietly and with some back-to-the-drawing-board resolve worked for the next three years to solve the many problems that confront any group reaching for that elusive next best thing. Evidence of this are the version numbers on the motor and controller as noted in Sonex CEO and General Manager Jeremy Monnet’s comment. “We have also already started our motor v4.0 design and motor controller v12.0 to be integrated on N270DC. Many more great things to come on this project!” Having seen Peter Buck’s video of early testing at the Experimental Soaring Association’s fall workshop in 2008, in which the controller self-immolated (later found to be the classic loose wire scenario) this writer was impressed with the openness of the presentation and the reminder that such developments are never as …
Not Your Father’s 172
George Bye, CEO of Bye Energy and head of the Green Flight Project, hopes to test fly the electric Cessna 172 in the spring of 2011. Recent illustrations show the “full-dress” electric craft with Ascent solar cells, a high-tech propeller, streamlined cowling, and vortex collectors at the wing tips’ trailing edges. Each element is intended to extend the range and efficiency of the airplane, a strong selling point, particularly in electrically-powered machines. Ascent Solar’s thin-film cells are thinner than a human hair, and thus will not impede the airflow over the wing’s surface. As the cells’ efficiency grows with development, they will provide greater flexibility of operation. Their resistance to failure, demonstrated in the video, will enhance the reliability of the overall airplane. George Bye has noted an economy of operation that might relight some aviation enthusiasts’ desire to go flying. Standard 172s cost about $35 to $50 per hour in direct operating costs, with those costs climbing as oil …
RGE Enters Ushuaia
Imperial College London’s Racing Green Endurance team has ended a 70-day adventure driving the length of the Pan-American Highway from Prudhoe Bay, Alaska to Ushuaia, capitol of Argentina’s Tierra del Fuego province, and southernmost city in the world. The 26,000 kilometer (16,120 mile) trip had moments of mechanical difficulties and some days of struggle. The electric supercar was stopped numerous times, sometimes for pushing speed limits, but often to satisfy police officers’ curiosity. Alexander Schey, M Eng in mechanical engineering and instigator of the trip, reports on his final hours on the journey with his co-driver, Toby Schulz, also an M Eng. “Finally I have a few moments to write the blog I have most been looking forward to write! 2 years of really hard work, 140 days of travelling and 70 days of driving have brought us to this moment, and I hope I can communicate to you just how incredible a feeling it is to have been able …
A Sweet Look Into the Future
Zach Hoisington, an engineer with Boeing Research and Development, proposes an electric airliner concept through the Subsonic Ultra Green Aircraft Research (SUGAR) program. During the CAFE Foundation’s fourth annual Electric Aircraft Symposium in Rohnert Park, California in April this year, he shared an amazing array of alternatives. Making airliners viable in an era of disappearing fossil fuel has caused NASA and aircraft producers to explore different design approaches, including joined wing aircraft, strut-braced wings, and hybrid wing-body configurations. Strategies for doing more with less may include aerial refueling for extended range flight with larger payloads, and formation flights on common routes like those of migrating birds to reduce induced drag. New sources of power may include hydrogen fuel cells and podded or integral batteries. Although the last option filled most of the talk, it came with the caveat that given current levels of battery development, it would take 5.5 million pounds of cells to produce the same energy derived from 60,200 pounds of …
Would You Believe There Are Two Electric Cri-Cri’s?
EADS, the Airbus people, gained a high degree of publicity with their four-motor Cri-Cri, as reported here previously, but a new contender has outraced it. Didier Esteyne flew the EADS plane for the press and showed it to good advantage. His mount was powered by four 15-horsepower electric motors, paired in pods on either side of the plane’s nose. The contra-rotating propellers gave a good performance judging from the in-flight video. EADS’ 60 total horsepower gave it a top speed of 141 miles per hour, but that was eclipsed by another electric Cri Cri, this one with a single 25-horsepower Electravia brushed motor on each stalk. Bigger motors swinging bigger propellers gave it a speed advantage and a world record of 262 kilometers per hour (162.44 miles per hour) , easily topping the Italian ENFICA-FC’s 135km/hr (83.7 mph) set earlier this year. Propellers were made by E-Helice, a part of Electravia, headed by Anne Lavrand, who also founded APAME, the French Association For the Promotion of Electric Aircraft. …
Where Are They Now? Part Three
One team has reached its destination, although belatedly, and another is closing on its goal as two electrically-powered epic journeys reach their final hours. Vislab’s orange Piaggio vans and their retinue of support vehicles entered Shanghai, China on October 28, 18 days after their anticipated arrival date; and the Racing Green Endurance (RGE) team from Imperial College London has passed from Chile into Argentina on its home stretch to Ushuaia, the southernmost city in the world. Vislab’s goal of testing autonomous vehicles on the two-continent expedition, with the possibility of one day establishing a modern silk road from Italy to China and applying lessons learned from this journey to making everyday driving safer, had its share of problems, but the expert team managed to overcome these and press ahead in grand adventure style. Their press release marks the notable accomplishment. “The first intercontinental expedition in history composed of driverless vehicles left Parma (Italy) last June 26 and, after traveling for …
163 Horsepower from 25 Pounds
ThinGap, LLC is well known for small motors with excellent performance characteristics, eliminating the use of iron and its resultant “lossiness” and depending instead on copper foil, rather than wire windings for its internally clean structure. The design leads to a lack of “cogging,” that notched feeling found when turning over some motors by hand. Each individual magnet causes the rotor to stop, or “cog,” sometimes making low-speed operation a bit hesitant and smooth transitions difficult. That, the unique ring design and an aluminum housing help carry heat away and allow for an internal controller. ThinGap have focused on smaller unmanned aerial vehicle applications for many years, but have moved into larger automotive and aircraft products, with one model in particular capturing our attention. The non-production 14090 ring motor is 14 inches in diameter, weighs 25.6 pounds and can deliver 122 kilowatts (163 horsepower) – about 6.4 horsepower per pound and close to the Halbach array motors of Geoff Long …
The Verticopter® , an Adaptable and Expandable Convertiplane
Oliver Garrow, founder, designer, and President of Garrow Aircraft LLC, says it right up front, “My design is completely counterintuitive.” Pilots are used to counterintuitive thinking. Push the nose down and add power when you’ve stalled and are heading groundward anyway, for instance. But the logic of what Garrow is doing becomes apparent only when you see the Verticopter® flying. Adaptable for varying flight characteristics, the Verticopter can be powered by one or more motors. A single motor, for instance, would provide a simple solution for a conventional takeoff and landing (CTOL) aircraft. A short takeoff and vertical landing (STOVL) airplane might use two or more motors. Full vertical takeoff and landing (VTOL) would require four to six motors. Motors can be pivoted on all models, providing vectored thrust that makes the most of the airplane’s unique configuration. Garrow sees electric power as ideal for this application, and the use of one or multiple motors simplifies the problem of vectoring the …
Motorcyclist Hums with Electric Bike News
One tenet of the CAFE Foundation’s outlook is that electric automobiles will be a major source of the new technology that will make electric aviation a practical reality. Large-scale production numbers for cars mean lower prices, ubiquitous motors and batteries, and demonstrated performance. Motorcycles offer another source for equipment that could see aircraft applications, since cycles share some of the same criteria for success, including light weight, compactness, and high output of both power and torque – especially true in the ultralight and light sport aircraft range. The motorcycle community’s normally lukewarm assessment of the prospects for battery-powered two-wheelers is heated up considerably in the November issue of Motorcyclist, and that bodes well for electric aircraft. Normally crowded with Harley, Ducati, and BMW gas burners, the magazine’s cover features a dynamic rolling shot of the recent Isle of Man electric Tourist Trophy winner. “SHOCKER! The Mind-Bending MOTOCZYSZ E1PC,” the cover blares, “165-MPH TOP SPEED, 135 HORSEPOWER, 250 LB.-FT. OF TORQUE, …
Getting Wired on the e-Spyder
Stephan Boutenko of Alternair passed this along, and it is worth a read. Jason Paur of Wired Magazine’s Autopia web site reports on flying Tom Peghiny’s e-Spyder, a combination of Tom’s Flightstar ultralight with a Yuneec motor, controller and battery. Paur’s impressions are highly positive, with the desire to continue the experience. He notes, “Flying on battery power is about the unique experience of flying without the noise, vibration and smells of a traditional engine pulling you along. It’s an entirely different sensation. And like gliding, it is about the challenge of flying within the limitations of the aircraft and maximizing your time aloft. “’It’s like hypermiling a flight,’ Peghiny says.” Hypermiling in automobiles is the act of conserving fuel by tactics such as accelerating gently to a speed somewhat above the average desired, then coasting to a point below that average and accelerating again. Electric aircraft may require such tactics for at least the immediate future until battery technology …