Electric Aircraft Sales Tell the Tale

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Electric aircraft sales told the tale at this year’s Paris Air Show.  European and American firms sold, or received letters of intent for, hundreds of craft, especially of interest in the electric, hydrogen, and hybrid categories we’ll discuss here.  We will have subsequent entries on other craft of interest at the show and the commercial possibilities they encompass. Afrijet’s electric intentions French airframer Aura Aero signed a Memorandum of Understanding (MOU) for “multiple electric aircraft” at the Paris Air Show.  This came a day after a Philippine-based Asian aerospace firm signed a Letter of Intent for three electric aircraft with Aura Aero. The 19-passenger, eight motor, ecologically friendly aircraft has an all-up weight of 8.6 tons and a hybrid cruising speed of 250 knots true air speed (288 mph).  Its pressurized cabin can alternately carry 1,900 kilograms (4,180 pounds) of cargo with a total volume of 21.5 cubic meters (759.3 cubic feet).  Total operating costs will run only one-tenth of …

Electra Rolls Out a Full-size Demonstrator

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Starting small, Electra Aero has rolled out a two-seat demonstrator of its multi-motor, blown-lift technology.  Bright yellow, the EL-2 “Goldfinch” celebrates “the beloved, nimble American Goldfinch bird indigenous to North America,” according to the company.  Its full-scale production aircraft will carry nine. John S. Langford, Founder and CEO of Electra.aero explains, “In the three years since we founded Electra, we’ve designed our eSTOL aircraft, validated our blown lift technology with a sub-scale demonstrator, and run a fully integrated test of our 150-kilowatt hybrid-electric generator at full scale.  Now we’re ready to test the entire system with this technology demonstrator aircraft. We can’t wait to fly this plane and show the world what our eSTOL aircraft can do.” Chris Courtin, Chief Engineer on the technology demonstrator project, explains the ambitious aircraft, a two-seat version of which will fly this year. Electra notes its “proprietary blown lift technology uses eight motors to provide additional wing lift, and hybrid-electric power that provides internal …

Miguel Iturmendi Hits New Heights

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The Perlan Project has special words for one of their pilots.  “It’s a big day for electric aviation and soaring. This morning after months of preparation, Perlan Pilot Miguel Iturmendi made 2 world altitude record claims for electric aviation under 500kg — max. Altitude and highest altitude in level flight, 16,000 feet in a motor glider! The new claim is 60% higher than the previous record. Congratulations Miguel!” Miguel has been higher, including a trip to 65,000 feet in 2019.  As pilots for the Perlan Project, Miguel and Chief Pilot Jim Payne hit a record height that day, although not the ultimate height for Perlan.  It’s not Miguel’s first, and probably won’t be his last record. He’s already gone to 20,000 feet in the modified Pipistrel Taurus he’s using for atmospheric research, but the altitude was not observed and verified by a certified observer for the National Aeronautical Association. The actual record was observed and certified by the NAA’s Kris …

Three Silicon 500 Kilowatt-hour-per-Kilogram Batteries

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Suddenly, three battery makers have announced silicon-based 500 kilowatt-hour batteries, a major leap forward for possible use in electric aircraft.  The three use varied techniques to achieve this significant energy increase. Amprius We covered Amprius’ new battery on March 28, noting its successful record-breaking flights in AALTO’s Zephyr HAPS (High Altitude Pseudo Satellite) aircraft.  This frail-looking but obviously over-achieving machine has loitered over the desert of New Mexico and beyond for over 64 days and nights, powered by a combination of sunlight and Amprius batteries. The batteries in particular just keep getting better.  That record was set with the last generation of Amprius cells, but future flights will benefit from the verified performance of their new 500 kilowatts per kilogram batteries.  Mobile Power Solutions performed such tests, showing results of >504 Wh/kg and >1321 Wh/l at 25°C. Pierre-Antoine Aubourg, Chief Technical Officer at AALTO HAPS, looks ahead.  “We look forward to taking advantage of Amprius’ 500 Wh/kg cell to further …

Diamond’s eDA40 and its Electric Ambitions

Dean Sigler Batteries, Diesel Powerplants, Electric Powerplants, Sustainable Aviation 1 Comment

Austria’s Diamond Aircraft launched its eDA40 last year, headed toward becoming “The first EASA/FAA (European Aviation Safety Agency/Federal Aviation Agency) Part 23 certified electric airplane with DC fast charging. Electric Power Systems’ DC fast charging system is capable of turning around a depleted aircraft in under 20 minutes.” Austria’s Diamond Aircraft has been developing environmentally responsible aircraft for the last several decades, starting with the hydrogen fuel cell-powered HK-36 in 2008.  Diamond promoted its work with Boeing Phantom Works as emitting nothing more than waste heat and water vapor, demonstrating “technology that may result in cleaner APU’s (auxiliary Power Units) for commercial aircraft of the future.” Diamond went beyond that over the next decade, using the HK-36 as a testbed for various hybrid and electric power variants.  In 2018, things had evolved to the HEMEP (Hybrid Electric Multi Engine Flying), a serial hybrid with two Siemens (now Rolls-Royce) motors on nose-mounted stalks powered by an internal combustion engine in the …

A Documentary about an Historic Electric Flight

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Saturday, April 22, from 2:00 PDT to 3:00 PDT, you will be able to view the world premier of a documentary by Remy Oktay about his  historic electric flight in a Pipistrel in 2022.  This would involve a flyover at his alma mater’s homecoming football game, giving his classmates an opportunity to see an electric airplane in action for the first time. The film will be shown at an event in San Francisco, but if you’re not in the neighborhood, you can register here to see it on line.  The event’s announcement should help you find the venue. ​”If this event has reached capacity or you would like to attend virtually, please register for the livestream here – https://lu.ma/7c8o06u9 ​”Silent Skies follows the groundbreaking journey of the college students who orchestrated and piloted the first-ever crewed electric airplane stadium flyover. Witness this milestone in America’s transition to electric aviation. “​This film premiere event features a presentation by students Remy Oktay ’24 and …

Heart Aerospace, BAE Collaborate on Batteries

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Heart Aerospace, a Swedish startup, has teamed with BAE Systems, a veteran British aerospace supplier, to help with powering its 30-seat, battery-powered airliner.  The four-motor craft will include a very large battery pack under the passenger compartment.  The need for safety should be obvious. Adding eleven seats to its original 19-seat platform, Heart also brings a turbo generator on board, enabling flights up to 400 kilometers (250 miles) with 30 passengers, or even 800 kilometers (500 miles) with 25.  These figures include normal airline range reserves. Partners include BAE Systems, Swedish aerospace group Saab, avionics supplier Garmin, and Aernnova, a Spanish airframe specialist. BAE’s UK-based group’s Controls and Avionics Solutions operation in upstate New York will oversee the batteries and their control and monitoring.   This fits BAE’s expertise, with more than 25 years of experience electrifying large, heavy-duty industrial vehicles with over 15,000 power and propulsion systems in service worldwide.  This will be critical considering the placement of the batteries. …

Electric Pterodactyl is a Blast from the Past

Dean Sigler Batteries, Electric Powerplants, Sustainable Aviation 1 Comment

Cory O’Neill recently test flew a special conversion of a classic ultralight, the Electric Pterodactyl Ascender.  Rising from the desert near Pahrump, Nevada, the light canard was propelled by an open-source power paraglider motor and battery pack – all neatly bundled in a back-pack-size unit. A True Cross-Country Trip An early flying wing version of what became the Pterodactyl, the Pfledge lacked a canard and relied on a combination of weight shift and aerodynamic controls.  Its designer, Jack McCornack and an early customer, Dave Froble, flew a pair of these craft from Monterrey, California to the 1979 Experimental Aircraft Association fly-in at Oshkosh, Wisconsin.  According to Ultralight News.com, “They made a big stir in Oshkosh that year – it is still referred to as ‘the year that ultralights really caught on’. At Oshkosh the editor of the Mother Earth News, an ecological publication, challenged the pair to fly on to Kitty Hawk, [North Carolina] on pure ethanol and offered to …

Amprius Announces 500 Watt-Hour per Kilogram Cell

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Amprius has announced a 500 Watt-hour per kilogram cell, essentially doubling the energy density available up to now.  Remember, though, that cell-levels of energy drop as the cells are incorporated into modules and packs, carrying the burdens of containment packaging, bus bars, and battery management systems (BMS) that lower total output.  Pack levels will be lower. Slow Progress This comes as the culmination of at least 14 year’s work, starting with Yi Cui’s work at Stanford University.  Your editor first saw him at a 2009 CAFE Foundation symposium at the Hiller Aviation Museum in San Carlos, California.  He was a proponent of the 10X battery, which at that time would have meant 10 times the energy storage of then typical cells, or around 10 times the 200 Watt-hours per kilogram then considered to be a respectable achievement. This blog reported in 2013, “According to Green Car Congress, ‘The company has also demonstrated greater than 650 and 700 Wh/L batteries with …

Nudging, Then Doubling an Electric Distance Record

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Suddenly, we’re seeing new electric aircraft nudging, then doubling an electric distance record.  First, Autoflight in China and then Beta in America achieve higher ranges than that previously achieved by Joby. Jules Verne Saw It Coming In two late 19th-century novels, Robur the Conqueror and Master of the World, Jules Verne chronicled the fictional adventurers of a mad inventor who thought he could dissuade world leaders from practicing war by bombing them from his Albatross flying warship.  A great deal like Captain Nemo of Nautilus fame, Robur uses violence to stop violence.  Both protagonists fail in their efforts. The Albatross, mistaken as its objectives were, is perhaps an inspiration for today’s eVTOLs, propellers spinning for lift and for forward motion.  Verne even prophesied fueling the Albatross with water, perhaps an early vision of today’s water-splitting to produce green hydrogen. Autoflight With far fewer rotors and propellers, Autoflight achieved a successful transition flight from vertical liftoff to forward flight.  This delicate …