Electric Sky to test long-distance power transmission for UAVs
Schematic of a typical laser power beaming technique. (Image: LaserMotive)
DARPA persists in funding research into extending the power range and mission endurance of UAVs.
Electric Sky is building a Whisper Beam transmitter to power UAV swarms wirelessly in flight, using Small Business Innovation Research funds from DARPA.
The Seattle-based SME will build and test a laboratory bench demonstrator at short distances. These experiments will supply data needed to upgrade the self-focusing beam with higher power for longer distances, and then adapt the transmitter to follow UAVs across the sky.
Wireless power tends to use lasers or microwaves, which start strong but weaken as they travel. In contrast, Whisper Beam technology starts weak and gathers strength the closer it gets to the receiver.
DARPA has been exploring wireless power transmission with UAV platforms for some time: in mid-2018, for instance, it selected the solar electric-powered Silent Falcon small UAS for its Stand-off Ubiquitous Power/Energy Replenishment – Power Beaming Demonstration (SUPER PBD).
The main aim of the project was to enable remote electric refuelling in small aircraft via high-intensity laser power beaming.
Whisper Beam technology self-focuses radio waves at the receiver, enabling the UAV to draw kilowatts of power in all weather. For military UAVs on combat operations, this could increase the mission operation time in contested and remote areas.
Whisper-Beam inventor Jeff Greason said: ‘It’s a myth that long-distance power transmission is impossible, it’s just never been economical. This new method reduces the cost of the ground transmitter and the size of the vehicle’s onboard receiver.’
Greason added: ‘Any type of electric aircraft can draw power while in flight – battery-electric, hydrogen fuel cell, and hybrid. Whisper Beam technology is particularly helpful in the power-hungry phases of takeoff and climb, enabling vehicle designers to meet other requirements to extend range, enhance flight safety, reduce peak loads on batteries, and shorten ground turnaround times.’
More from Defence Notes
-
![Israel defence ministry pushes ambitious spending plans for tanks, drones and KC-46 aircraft]()
Israel defence ministry pushes ambitious spending plans for tanks, drones and KC-46 aircraft
The procurement and acceleration production plans – some of which still await approval – across the air and land domains will aim to strengthen the operational needs of the Israel Defense Forces.
-
![US reforms its defence acquisition system to focus on commercial capabilities]()
US reforms its defence acquisition system to focus on commercial capabilities
This shift is planned to accelerate the procurement and fielding of capabilities. As part of this strategy, the US also intends modernise its regulations in an attempt to change its bureaucratic and risk-averse culture.
-
![Australia’s Exercise Talisman Sabre concludes after a series of firsts]()
Australia’s Exercise Talisman Sabre concludes after a series of firsts
More than 40,000 military personnel from 19 participating nations took part in the 11th iteration of the biennial Exercise Talisman Sabre multi-domain event which was held across Australia and in Papua New Guinea.
-
![US Africa Command targets logistic solutions]()
US Africa Command targets logistic solutions
AFRICOM is seeking IT systems and supply chain management solutions to enhance interoperability and standardise logistical processes in its area of responsibility.
-
![Rheinmetall sales up by almost a quarter on wave of German spending]()
Rheinmetall sales up by almost a quarter on wave of German spending
Germany’s Rheinmetall released its 1H 2025 results on 7 August, continuing the strong growth of recent years. A particular highlight of the result’s presentation was the Skyranger air defence system for which the company is predicting sales of about US$8.2 billion from the German Government before the end of the year.
-
![Defence companies continue to ride procurement wave]()
Defence companies continue to ride procurement wave
Vehicle and technology companies are reporting substantial growth compared to the first half of 2024. Italy’s Fincantieri saw revenues jump 24% for the first half of the year compared to 2024 and Thales up 6.8% for the same period. General Dynamics reported second quarter revenue growth of 8.9% for the second quarter compared to last year and MilDef reported organic order intake growth of 58%.
