A Joyous Boxing Day Electrified

Dean Sigler Announcements, Batteries, Electric Powerplants, Solar Power, Sustainable Aviation Leave a Comment

Boxing Day is a holiday unique to the British Empire, a day-after Christmas gift-giving celebration in which the well-off gave gifts to their servants. Yahoo Entertainment explains, “While there is some dispute over what the name actually means, it’s commonly believed that Boxing Day refers to the habit of aristocratic employees gifting their servants or tradesman on Dec. 26 as a thank you for their work throughout the year. The employers would give them each a box to take home to their family with gifts, bonuses and leftover food. “Samuel Pepys, a naval administrator and Member of Parliament, is famous for writing in his diary in 1663: ‘Thence by coach to my shoemaker’s and paid all there, and gave something to the boys’ box against Christmas.’” Certainly some regifting was in action, a chance for the upper class to get rid of fruitcakes sent by maiden aunts, or to reward particularly meritorious servants. In the spirit of Boxing Day, your …

Tiny Pieces Form Morphing Wing

Dean Sigler Electric Aircraft Components, Electric Aircraft Materials, Sustainable Aviation Leave a Comment

MIT and NASA have constructed several aircraft wings using tiny, identical pieces bolted together in a highly flexible, deform-able structure.  At that, the wing is light, strong, and capable of “morphing” in ways that enable slower landing speeds, faster rates of climb, and high maneuverability. A Lot like Fractals This type of assembly is much like fractals, repeated forms that assemble into larger forms that become enlarged examples of the smaller ones.  These forms are part of the natural world, so the mimicry in the morphing wing can very mach be said to be an organic design. The tiny pieces comprise thousands of miniature triangles “matchstick-like struts,” according to David L. Chandler at the MIT News Office.  The tiny subassemblies were bolted together by hand  to form a lattice-like framework, and are then covered with a thin polymer film of the same material as the framework.  Future plans call for robot assembly to speed up construction. As Chandler writes, “The …

Lighter, Stronger, and Morphable

Dean Sigler Sustainable Aviation 2 Comments

If you have a pre-teen roaming around the house, you more than likely know the shared delight of assembling the biggest possible thing you can make from Lego® blocks.  There must be something of that delight in the Center for Bits and Atoms at the Massachusetts Institute of Technology (MIT). There, researchers have invented, “A new approach to assembling big structures — even airplanes and bridges — out of small interlocking composite components,” according to a story by David L. Chandler of the MIT News Office. Neil Gershenfeld, director of the Center, and post-doctoral student Kenneth Cheung recently co-authored a paper published in the journal Science, in which they describe assembling strong lightweight structures with “cubocts,” lattice structures that are the lightest and strongest in existence, as stated in the Center’s publications. The Center claims 12.3 megaPascals, or 1,784 pound per square inch strength for the 7.3 milligrams per cubic centimeter material (about 0.45 pounds per cubic foot).  Balsa wood, …

Deturbulating a Record Flight

Dean Sigler Diesel Powerplants, Electric Powerplants, GFC, Sustainable Aviation Leave a Comment

Sumon K. Sinha, Ph.D., P.E., and head of Sinhatech, had a part in the recent Federation Aeronautique Internationale (FAI) record by Mr. Jean-Luc Soullier and recorded in a blog entry on March 10. Dr. Sinha wrote that, “CAFE Foundation’s Blog on March 10th, 2012 did not mention that the Colomban MC-30 aircraft had Sinhatech’s Deturbulator tape treatment on the wing upper surface as shown in the attached photograph. I would like to have this added to complete the description of the aircraft.” Sinhatech Deturbulator tape is an innocuous-looking strip applied along the span of a wing at a point which will trigger a response from the tape, which oscillates in the airflow, increasing lift and mitigating skin friction, according to company white papers. Dr. Sinha points out that, “This is the first independently recorded flight with wing Deturbulator treatment by FAI. It is also the first independently recorded flight with full-span Deturbulators on a powered aircraft.” The Sinhatech web site …

Saving the Air While Saving Crops

Dean Sigler Diesel Powerplants, GFC, Sustainable Aviation Leave a Comment

AvWeb this morning reports on a “highly cost-effective” way to make jet biofuel from renewable materials.  According to AvWeb, San Francisco-based, “AliphaJet said its catalytic method uses materials derived from plants and animals such as triglycerides and fatty acids.  ‘Our strategy fundamentally improves the economics of making 100-percent drop-in renewable jet biofuel,’ said Jack Oswald, CEO of AliphaJet. ‘Our approach is radically different and unlocks a new industry that can meet the U.S. Navy’s goal of replacing 50 percent of its liquid fuels with renewables by 2020.’ “AliphaJet said its catalytic de-oxygenation process ‘significantly reduces capital and operating costs’ because it does not require the use of hydrogen in processing. That means the processing plant can be less complex, reducing capital costs. It also saves money because the biofuel can be produced close to the site of the raw materials, without the need to be close to a hydrogen source. The company says its process can also produce renewable drop-in …

A Seraph in the Earthly Sphere

Dean Sigler Electric Powerplants, GFC, Sustainable Aviation 2 Comments

A Seraph is a six-winged angel in the first sphere of the celestial hierarchy, and while the earthly form in Richard Ike and Ira Munn’s vision may have fewer wings, it is no less inspired. In part, it’s inspired by biomimicry, imitating nature in its forms and even its structure.  The  airfoil-shaped profile of the fuselage “reduce[s] drag and optimize[s] aerodynamic efficiency, the blended-wing-body and lifting body (flying fuselage) maximize lift and produce minimum drag, according to Seraph’s web site. Seraph explains, “Flight with the Seraph will be made possible by two factors, lift generated by airfoil and lift generated by vortex.  The later factor is a return to a principle originally explored by Leonardo Da Vinci.”  Their site further explains that, “This new field of study is called ORGANIC AERONAUTICS, or ‘Green Aviation’ (Aerospace inspired by nature). It is also a discipline of the science called Biomimicry: using nature as Model, Mentor, and Measure.” Its exo-skeletal structure emulates insect …

Matters of Note for the Green Flight Expo

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One humanitarian business organization that will display at the Green Flight Expo following the completion of that seven-day event uses the type of technology the CAFE Foundation espouses for carrying medicines and supplies to remote parts of the third world that otherwise do not easily permit transport of any kind. Matternet’s slogan, “Lifting the Rising Billion” refers to those living primarily in Africa and is explained in their statement of belief.  “By increasing the access to reliable transportation for people living in poverty, we will enable them to find a sustainable path out of poverty. “We will connect people from geographically isolated communities to local and global markets through the Matternet.”  This credo applies to poor communities throughout the world, and Matternet is committed to creating airborne supply networks worldwide. Mechanisms are simple enough, with quadrotor helicopters, much like those used by Stanford Professor Sebastian Thrun and his alumni, Nicholas Roy (now assistant professor at MIT) in their investigations of …

The G4 Gets Off the Grass

Dean Sigler Electric Powerplants, GFC, Sustainable Aviation Leave a Comment

Pipistrel had a good week at Oshkosh.  Shortly after its G4 placed ninth in the Dead Grass Awards, an indication of the number of spectators who tramped around the perimeter of the displayed aircraft,  the company could announce the first test flight of the four-seat electric motorglider. “We are pleased to announce that after long and demanding work nearly of a nearly 30-member team of developers and constructors from Pipistrel’s R & D Institute the first 4-seat electric aircraft in the world took off this morning [August 12, 2011] at 7 AM local time.” Pipistrel overcame several difficulties in achieving this milestone.  Developing the electric power system, the most powerful currently in an aircraft, and importing the 450 pounds of lithium-polymer batteries needed to energize it presented many issues.  Perhaps the utterly new and unique design and the possibility of that many batteries self-igniting caused insurance companies to be more than normally cautious, although one did finally step forward. Because …

If You Can Draw It, We Can Print It – In 3D

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Students and faculty at the University of Southampton on the southern English coast have created an unmanned aerial vehicle (UAV) in just a week, from the initial design to the finished, flying object. “Printed” from nylon on an EOS EOSINT P730 nylon laser sintering machine, the plane emerges from the device in successive layers and comes with hinges already in place, emulating the bearings, crank and headset-in-place bicycle recently produced by EADS (Airbus) using similar technology and materials. http://www.youtube.com/watch?v=aFFFiB_if18 Part of a “ground-breaking” course of study “which enables students to take a Master’s Degree in unmanned autonomous vehicle (UAV) design,” the Southampton University Layer Sintered Aircraft (SULSA) can be snap-fitted together in minutes without tools. SULSA has a 2-meter (6.4 feet) wingspan and an electric motor reputed to be “almost silent” in cruise mode (but not so much in launch mode as the video reveals).  It is steadied by a “miniature autopilot developed by Dr. Matt Bennett, one of the …

The Verticopter® , an Adaptable and Expandable Convertiplane

Dean Sigler Electric Powerplants, Sustainable Aviation 4 Comments

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 …