David Ullman: Flying on Multiple Tiny Motors

Dean Sigler Batteries, Electric Powerplants, Sky Taxis, Sustainable Aviation Leave a Comment

David Ullman, a professor emeritus at Oregon State University, predicted electric flight’s future in articles in 2009* and 2010**.  His predictions have come (mostly) true and David is working to fulfill the rest.  His background in mechanical and aeronautical engineering provides credibility for his prognostications, and he’s taking practical steps to take electric aviation to a next, very creative level. While Uber’s Elevate Summit in Dallas earlier this year focused on big-money players in the vertical aviation world, David and co-creator Vincent H. Homer promoted their paper, “The IDEAL for Near-VTOL Aircraft.”  IDEAL represents “Integrated Distributed Electric – Augmented Lift” flight, using “thrust from distributed electric propulsion to improve the lift and drag performance of the aircraft during takeoff, cruise and landing.”  As their paper explains, VTOL flight requires power equal to 1.25 times the weight of the aircraft to ensure secure takeoffs and landings.  An IDEAL aircraft would require thrust equaling about one-third of the STOL craft’s weight to …

A Range Extender You Can Ride Home

Dean Sigler Electric Powerplants, Hybrid Aircraft, Sky Taxis, Sustainable Aviation 1 Comment

Range extenders make any airplane to which they are attached a hybrid aircraft, with an engine-driven generator charging batteries or driving one or more electric motors that provide thrust.  Speaking today at the 7th EASN International Conference on Innovation in European Aeronautics Research, Richard Glassock, a Fellow at the Institute of Aerospace Technology at the University of Nottingham, gave the range extender a completely new mission. His innovation comes in two versions, the RExLite and RExMoto.  RExLite is a simple generator drive that mounts under the aircraft.  RExMoto looks similar – a streamlined pod under the aircraft – but can be converted to a motorcycle when on the ground.  Both “use conventionally-fueled combustion-engine-driven electrical generators to provide energy at peak efficiency and minimum emissions, effectively converting the All-Electric to a Hybrid Electric aircraft.” RExLite Range Extender RExLite manages to contain a 40 kilowatt (53.6 hp.) engine-generator in the 60 kilogram (132 pound – depending on fuel load) pod.  According to …

Volocopter Starts Autonomous Air Service Trials in Dubai

Dean Sigler Sky Taxis, Sustainable Aviation Leave a Comment

In June, Dubai’s Road and Transit Authority (RTA) announced its plans to test fly Volocopter’s 200 over the country by the last quarter of this year.  The government and Volocopter have succeeded in meeting that timeline, with demonstrations this week of Volocopter’s quiet ability to fly autonomously (although without passengers so far).  Aerial transit will be a small part of a much broader scheme, the government intent on providing excellent public transportation, as shown in this well-produced video. To ensure meeting Dubai’s ambitious goal, Volocopter’s designers tested the machine thoroughly in German skies.  Note the Grob Strato 2C by one of the hangars, the twin-engined airplane in which Einar Enevoldson, founder of the Perlan Project, set the still extant world altitude record for propeller-driven airplanes in 1995 – 60.897 feet. With fresh infusions of 25 million euros from Daimler AG and “serial entrepreneur” Lukasz Gadowski, Volocopter has been able to achieve this early trial as a sky taxi.  Both Volocopter …