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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →RAVEN is a research drone that uses spring-assisted, bird-inspired legs to jump into flight—and to move on the ground. In tests, jumping helped the fixed-wing aircraft gain initial flight speed more efficiently than take-off without a jump. It remains a research prototype, not a drone available to buy or an operational delivery aircraft.
What is the RAVEN drone?
RAVEN stands for “Robotic Avian-inspired Vehicle for multiple ENvironments.” Researchers at EPFL and collaborating institutions designed it as a fixed-wing aerial robot that can also move on the ground. The Nature paper describing the system was published on 4 December 2024: “Fast ground-to-air transition with avian-inspired multifunctional legs”.
The concept addresses a constraint of fixed-wing aircraft: they need enough forward speed to generate lift, usually gained through runway distance or a launcher. A jump can provide some of that speed at launch, while the legs also let the robot perform selected ground movements.
How do its bird-like legs work?
RAVEN’s legs borrow principles from birds without reproducing their anatomy. Each has linked segments and simplified joints that emulate a hip, ankle, and foot. Springs at the ankle and toe flex under load and store energy, then release it to help drive a jump. The spring-assisted design supports more than one movement pattern while keeping the mechanism simpler to control than a literal bird-leg replica.
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That arrangement lets the robot use its legs both to push off for take-off and to move between flight attempts. The researchers’ aim is multifunctionality: one mechanism contributes to launching the aircraft and to terrestrial movement.
What can RAVEN do on the ground?
Demonstrations showed RAVEN walking, hopping across a gap, and jumping onto an elevated obstacle. Nature’s supplementary video captions specify a gap of 11.5 cm and an elevated position of 26 cm. These are demonstrations of particular movements, not evidence of robust autonomous navigation across varied terrain.
The walking result also has an important qualification: the supplementary captions report that erect walking was not continuous and that the robot fell after several steps. The prototype shows that leg-based ground movement is possible, but not that it can reliably walk around like a bird or a mobile robot designed for sustained navigation.
Does jumping make take-off faster or more efficient?
The Nature authors report that jumping contributes substantially to RAVEN’s initial take-off speed and is more energy efficient than taking off without a jump. That is a comparison among experimental take-off strategies for this robot—not a general claim that bird-like legs make drones more efficient than conventional aircraft.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11UC Irvine’s account says a jump-only transition was nearly as fast as one assisted by the propeller and faster than standing or falling strategies. IEEE Spectrum describes non-jumping take-off as unstable and reports an approximately tenfold energy-efficiency comparison against standing take-off. That numerical framing belongs to IEEE Spectrum’s account of the RAVEN experiment; it should not be read as a universal efficiency ratio.
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In short, the jump supplies an initial push that can help a fixed-wing vehicle reach flight speed, but the result depends on what it is compared with. The cited work does not establish that the added legs are worthwhile for every fixed-wing drone, or that the robot outperforms ordinary commercial drones in general.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What did the prototype’s tests measure?
IEEE Spectrum reported that the RAVEN prototype weighed 620 grams, of which 230 grams were attributed to its feet, toes, actuators, and related hardware. The same 2024 account reported a jumping take-off reaching nearly 0.5 m in altitude and 2.2 m/s forward velocity. These figures describe the reported prototype and test, not expected performance for other aircraft.
The measurements illustrate the design trade-off: the legs add mass and mechanical complexity, but they provide both a launch mechanism and ground locomotion. Whether that trade-off is useful will depend on the mission and terrain; the reported demonstrations do not establish an operational advantage for a deployed aircraft.
Is RAVEN a product or a field-ready drone?
No. The sources describe a research proof of concept and do not identify a commercial product, payload service, or operational deployment. They also do not demonstrate payload delivery, autonomous navigation between ground and air, or a scaled-up aircraft. The Nature paper says further research is needed to scale bird-inspired multifunctional legs to larger drones capable of autonomous navigation between terrestrial and aerial environments.
Potential applications in complex terrain are a motivation for the approach, not an achieved capability. RAVEN is best understood as an experiment in combining fixed-wing flight with selected bird-inspired ground movements.
Quick Recap
Sources
- Nature: “Fast ground-to-air transition with avian-inspired multifunctional legs”, version of record published 4 December 2024.
- IEEE Spectrum: “Bird-inspired Drone Uses Legs to Walk and Jump into the Air”, 2024.
- UC Irvine Department of Ecology and Evolutionary Biology: “Bird-inspired leg enables robots to jump into flight”, 4 December 2024.
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