Bouncing Light Around Between Electrons and Holes

Dean Sigler Hydrogen Fuel, Solar Power, Sustainable Aviation 0 Comments

Bob Elliott of the comedy team Bob and Ray died February 3, reminding your editor of one of the many routines Elliott and Ray Goulding performed on live radio.  It involved an inventor who had perfected a solar panel that could run the lights in your house all day, but couldn’t keep them going at night when they were really needed.  That was over 50 years ago, and investigators at the Pacific Northwest National Laboratory, Argonne National Laboratory, SuperSTEM, and the University of Oxford have come up with a possible solution to Bob and Ray’s quandary. Combining two oxides, one containing strontium and titanium (SrTiO3) and the other lanthanum and chromium (LaCrO3), they came up with a material that uses the interface …

EnergyOr Ups the Ante for Endurance

Dean Sigler Fuel Cells, Hybrid Aircraft, Hydrogen Fuel, Sustainable Aviation, Uncategorized 0 Comments

Staying airborne for more than an hour or two might seem like a huge leap for battery-powered electric aircraft.  Inspired designers like Eric Raymond have been able to use solar cells to extend their flights to near-perpetual states.  A large craft like Solar Impulse 2 remains in flight for up to five successive days and nights only through careful energy management and flight planning.  Researchers are looking at hydrogen fuel cells as an alternative to batteries, with the hopes of achieving greater endurance. One company, EnergyOr, has developed two still small fuel cells to power their rotary- and fixed-wing drones, setting several records in the process.  With payloads and maximum takeoff weights that enable carrying a 4K camera or large …

Fuel Cells for Drones: Going for Endurance

Dean Sigler Fuel Cells, Hydrogen Fuel, Sustainable Aviation 0 Comments

Several fuel cell developments show there are lots of options for burning hydrogen, if we can only make and distribute it in great enough quantities.  Most noteworthy, fuel cells could provide increased endurance and range compared to batteries. Professor Gyeong Man Choi and his Ph.D. student Jun Joong Kim, working at the Pohang University of Science & Technology (POSTECH) in South Korea, have developed a miniaturized solid oxide fuel cell (SOFC) that can fly a drone for more than an hour.  On the consumer front, their fuel cell would allow cell phones to be charged just once a week. The professor and his students created the fuel cell to directly replace the batteries normally found in cell phones, laptop computers, …

Little Green Beads to Power Your UAV or Ultralight

Dean Sigler Electric Aircraft Components, Hydrogen Fuel, Sustainable Aviation 0 Comments

January 19 marked the first flight by a Raptor UAS drone using pelletized hydrogen to power a fuel cell that generates electricity and makes the propeller turn. Energy Pellets Cella Energy, a Scottish-based enterprise, is now producing small quantities of their little green beads (just in time for Mardi Gras), filled with solid-state hydrogen.   Claimed to have “two or three times” the energy per weight of the best of lithium-ion batteries, Cella’s pellets are designed to enable low-pressure transportation of hydrogen in a form that allows fueling to take place with a bit of magic sleight of hand.  Looking like miniature green dumplings, Cella’s mix of plastic and encapsulated hydrogen has the advantage of using existing infrastructure, “with minimal alterations.”  Think …

Fuel Cells for Taxiing

Dean Sigler Electric Aircraft Components, Electric Powerplants, Hybrid Aircraft, Hydrogen Fuel 0 Comments

What seemed like an easy transition a few years ago has been delayed by one developer.  “Safran and Honeywell have delayed by two years the planned entry into service of their electric green taxiing system (EGTS), a device designed to enable an airplane to taxi with its engines shut down. Aviation International News (AIN) quoted a spokesperson as saying, “The team is still working on the program with a goal of certification in 2018 and entry into service shortly after.”  The system uses motors on the main gear to enable taxiing under power.  One of several competing systems, WheelTug, has motors on the nose gear only. Wheeltug uses a Boeing 737-800 as a testbed for the certification program. A  United …

Turbocharged Fuel Cells

Dean Sigler Electric Aircraft Components, Electric Powerplants, Hydrogen Fuel, Sustainable Aviation 1 Comment

The Engineer, a British publication, reports on a turbocharger for fuel cells.  Because a fuel cell is a cross between a combustion engine and an electric motor, the concept of pushing extra air through the fuel cell to increase power is similar to that of turbocharging a regular two- or four-stroke engine.  The publication says this could double the output of a hydrogen fuel cell. Like other combustion engines, a fuel cell can be limited by the airflow entering, that supply limiting their ability to release positively-charged hydrogen ions. Bryn Richards, CEO of Aeristech, explains, “Our proprietary high speed motor and control technology allows us to deliver air at a much higher pressure [than existing systems].  No other motor control …

The HY4 Will Be Part of a Bigger Plan

Dean Sigler Electric Powerplants, Hydrogen Fuel, Sustainable Aviation 0 Comments

As part of a planned network of hydrogen-fueled Air Taxis, DLR’s HY4 four-seat airplane will initially land at one of 60 fields in Germany outfitted to supply its unique needs.  These fields will have hydrogen storage and fueling systems for ground transportation, making for a large web of clean transportation by air and land. With various car manufacturers promoting their hydrogen vehicles, it would be easy to see hydrogen aircraft landing, passengers departing in H2-powered cars, and even hardy explorers pedaling to and from the airport on their H2 bikes.  One bicycle maker is planning to be part of the 60-airport plan. The Linde Group showed off its innovative pedelec (“pedal electric cycle”) this week.  Instead of a battery, it …