Powerful Pancakes

Dean Sigler Uncategorized 1 Comment

AST, Automation Source Technologies, has a line of compact “pancake” motors that are of interest to those designing electric aircraft. Their CDS Series have power outputs ranging up to 21 kW, efficiencies up to 93.2 percent, and weights of no more than 21 kg. The CDS 150, largest in the line, can be either water or air-cooled, handles inputs from 24 to 96 Volts DC, and operates at 1,000 to 6,000 rpm. High torque peaks, and a three to four times overload capacity might make this eight-pole series worthy of consideration.  

Sanyo Starting Mass Production of EV Batteries

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Sanyo Electric Co., Ltd.  has announced that mass production of its EVB-101 battery package will begin in 2010.  This compact package – 366 × 213 × 66 mm – or 14.4 x 8.39 x 2.60 inches, wraps a group of 18650-size computer batteries in a water-resistant aluminum housing, complete with a standard communication plug for battery management and monitoring.  The 14 in series, six in parallel package stores 10.8 Amp hours of energy and weighs about seven kilograms (15.4 pounds).  It has a maximum discharge current of 120 Amps and a continuous output of 35 Amps. The batteries got a good workout in Yokohama Rubber’s E-V Buggy at Pike’s Peak on July 19, posting the second best time by an electric …

A Tale of Three Pauls

Dean Sigler Uncategorized 3 Comments

Dr. Paul Robertson lectures at Cambridge University’s Engineering Department, and Paul Dewhurst serves as Director and Chief Flying Instructor at Flylight Airsports, Ltd.  The two Pauls made simultaneous takeoffs March 1, 2009 in Britain’s first two electric aircraft.   A third Paul, Welsh by name, acted as certification engineer for the effort. Dr. Robertson took to the skies in a Dragonfly hang glider powered by a Geiger/Eck 10kW motor/controller/propeller combination, while Dewhurst became skyborne in a Lazair ultralight propelled by a pair of Plettenberg Predator 12 kW (peak output) model airplane motors.  This testbed in particular reflects Dr. Roberton’s studies toward the constuction of a sub-115 kg electric twin called Hummingbird.  His PowerPoint presentation shows the mathematics of powering such a craft on …

A Great Year and Gala Day for Yuneec

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 Last year, we knew Yuneec for its tidy power package for paramotors, the 10 kW EPac.  We were awaiting developments on the EP200, a twin-motored, single-place ultralight that looked as though it would be powered by two EPac units.  Springtime, 2009 brought the news that a two-seater was under development, and summer brought surprise after surprise.  The 40 kW (54 horsepower) E430 made its first flights on June 12, 2009, followed by further testing on June 20.  Test pilot Sun Xun managed two flights of 15 minutes, achieving a top speed of 150 kilometers per hour (93 mph) a climb rate of 7 meters per second (1,377 feet per minute), and a maximum altitude of 300 meters (960 feet).  Sun …

A Smart Electrical System for GA

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Dr. Seeley made this available to Green Flight Challenge competitors. As a follow-on to your ideas for simplifying pilot licenses that I presented at Electric Aircraft Symposium III: Here is a link to a very encouraging development debuted at Sun & Fun: A comprehensive, integrated, smart electrical system for GA from Marc Ausman at Vertical Power Corporation ($1500 – $12,000). This looks like a very helpful reducer of pilot workload to help make flying simpler. The more up-scale versions offer redundancy and this technology should save weight and free up panel space as well. Also, the array of COTS eCFI/flight control options from MGL Avionics is very impressive too. Sure wish I had time to build a homebuilt aircraft with …

Solar Impulse Rollout and All Motors Running

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November 6, 2009, Solar Impulse left its hangar and Markus Scherdel, the project’s test pilot, ran all four motors on the giant craft.  This marks the beginning of ground testing for HB-SIA.  “With its engines running at full power, it gave the impression of wanting to get off the ground straightaway …but it won’t be long now before we release the brakes and let it roll its first few meters,” said André Borschberg, co- founder of Solar Impulse.  The four motors achieved full power at 400 rpm. Bertrand Picard, the originator of the project, was equally enthusiastic. “For the whole team, the impression of seeing it completely assembled, majestically reigning over the Dübendorf tarmac was very intense!  We just can’t …

Ready to Launch

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LaunchPoint Technologies, Inc. announces the highest power to weight ratio of any known electric motor – seven horsepower for 1.4 pounds (635 grams) or five pounds per horsepower.  As a comparison, the tiny Neutrino outrunner by Steve Neu of Neumotors weighs 14 grams and puts out 125 watts, peak.  That would add up to 784 grams at 7 horsepower if that motor were scaled up to match the output of the LaunchPoint unit.  The LaunchPoint motor is not only lightweight, but surprisingly small, scaling only six inches in diameter and one inch in thickness. It is composed of a great deal of carbon fiber in its plate-like structure. Behind this astonishing power output is the use of a Halbach array, “an arrangement …

How Small Can You Make A Gyro?

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MEMS (micro-electrical-mechanical systems) are rapidly becoming hot items in the electronics market. Consider the rather amazing controllers for WII games.  These provide a degree of haptic feedback, partly based on the MEMS inside.  Your iPhone or GameBoy have MEMS devices that allow realistic banking and turning on screen – again based on gyro feedback from MEMS devices. Consider putting this micro-gyro capability into a heading hold and wing leveler device in an electronic certified flight instructor envisioned by the CAFE Foundation, and you can see why this technology holds promise for safer flight and expanded light aircraft capabilities. Eagletree has a range of telemetry and monitoring products for model aircraft that combine this technology with sophisticated radio gear, including video …

LCA – Life Cycle Analysis

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The Link below provides a conceptual background for the study and chart, which give us insight into life cycle analysis, a valuable tool for determining the true costs of our energy sources. Note in the following that the actual costs and carbon emissions for a product may be greater than those for the actual operation of that product.  Obviously, wind turbines and solar cells are clean in their operation – but what does it cost to manufacture, transport, and dispose of the obsolete or unservicable units?  This is a good tool for making those assessments, but I’d love personally to have even more definition of the “human equivalents” listed in the chart found in the link below.  Perhaps an expert in …

Power Up Front

Dean Sigler Uncategorized 1 Comment

Luka Znidarsic and Matija Znidarsic, both experienced sailplane pilots and mechanical engineers in Slovenia, have developed a Front Electric Sustainer, a power system that provides a climb of 1.5 meters per second (198 feet per minute) for their prototype configuration on an 18-meter LAK 17.  They designed their own motor and controller for the application.  The motor is 5 kg (11 pounds), and puts out 15 kW (20.1 horsepower) at 85 Volts.  Total weight for the power package is 35 kg (77 pounds), with batteries in two packs behind the rear spar, balancing the weight of the motor and propeller in the nose. “Front” refers to the motor’s location, right in the nose of the sailplane.  A 0.9 meter (35.4 inches) …