Singapore engineers built ALBATROSS, a tiny drone that spins down like a maple seed, rights itself on the water and then sails on wind power.
Engineers at the Singapore University of Technology and Design have built ALBATROSS, a 1.1 kg robot that is dropped from a carrier drone or plane, spins down like a maple seed and lands softly on the sea. Once floating, it flips upright without motors and uses its wings as sails, with a fish-tail rudder to steer and give a push when the wind fades.
The point is speed and simplicity. Scientists could fly it to an oil spill, an algal bloom or a storm zone and leave it collecting data, with no boat or crew needed. It uses only three actuators and three navigation sensors, fewer than similar robots.
It is still a research prototype, and the next hurdle is proving it can handle rough, real-world seas.
Most drones fight gravity with spinning propellers. ALBATROSS, a 1.1 kg sailboat drone prototype from Singapore, does the opposite: it gets dropped from the sky, spins down like a falling maple seed, lands on the sea and then sails away on the wind.
That sounds like a party trick, but it tackles a real headache. When an oil spill spreads or an algal bloom turns a bay green, scientists need sensors in the water fast, and sending a boat and crew takes time and money. A light robot that can be flown to the spot and left there to keep measuring could make that work quicker and cheaper.
ALBATROSS is a small research robot built by seven engineers at the Singapore University of Technology and Design (SUTD). The name is a stretched acronym for Airborne Lander with Buoyant AuToROtating Sailing Sensor, and the team describes the design in a study published in the journal Science Robotics.
The prototype weighs 1.107 kilograms, about the same as a large bag of sugar. It has no propellers for flying and no landing gear. Instead, a bigger aircraft or a carrier drone carries it up and lets it go.
From there, the robot does three jobs in a row: it slows its own fall, it flips itself upright once it hits the water, and it turns into a wind-powered boat. The clever part is that the same few parts handle all three.
The robot slows its fall using autorotation, which simply means a wing that spins by itself as air rushes past it. If you have watched a maple seed whirl down from a tree, you have seen it. The spinning wing acts like a small helicopter rotor with no engine, creating lift and braking the drop.
ALBATROSS uses rigid wings that start turning on their own once it is released. There is no motor and no parachute. The spin also keeps the craft steady on the way down.
That matters at the moment of impact. By the team’s estimate, the same robot dropping straight down with no spin would strike the surface carrying roughly 18 times more energy, which could be enough to break it. With the spin, it touches down gently, rights itself almost right away and needs no motors to do so.
Once it is floating, the wings that spun it through the air become its sails. Wind pushes on them and moves the robot across the surface, so the long part of the mission costs almost no battery power.
Steering comes from a rudder shaped and moved like a fish tail. It turns the craft, and it can also flap to push the robot forward when the breeze dies, so ALBATROSS is not left bobbing in place on a calm day.
The hardware list is short. The robot runs on three actuators (the small motors that move parts) and three main sensors for navigation. Comparable robots that work in both air and water typically need six to eight actuators and more sensors, and every extra part is one more thing that can fail at sea.
The SUTD team says its design avoids flying propulsion, complicated folding mechanisms and active balancing during the switch from air to water, and that the robot can sail back to shore when a job is done.
The team claims ALBATROSS could travel more than 100 km. That is far beyond the roughly 7 km reported for SailMAV, an earlier sailing drone that can also fly.
Its real field record is more modest but still impressive. In tests, the researchers released it from a carrier drone at about 500 feet. It spun down, settled on the water, turned upright and then sailed between GPS waypoints with nobody steering it. In one trial it sailed autonomously for about three hours while logging environmental data.
It also fills a gap next to larger ocean robots. Well-known autonomous sailing platforms such as Saildrone and Sailbuoy are much bigger and can need support from shore teams or ships during some operations. ALBATROSS is meant to be quick to drop in and simple to leave alone.
You will not be buying one. ALBATROSS is a lab prototype, not a product, and there is no price or launch date. Its value is in what it could do for the people who watch over coasts and oceans.
The researchers point to jobs such as:
For people living near the coast, faster data in those moments can mean earlier warnings about polluted water, quicker clean-up decisions and less guesswork about when a beach is safe again. Cheap, light sensors that do not need a crewed boat could also let agencies watch more places at once.
The big test is the real ocean. A calm trial is very different from gusty wind, choppy waves and changing currents. The descent has to stay steady, the self-righting has to work every time, and the sails and rudder have to cope with rough conditions for hours or days.
The team has not said when, or whether, the design will move beyond research. For now it is a neat proof that a robot can fall, float and sail using the same handful of parts.
No. It has no flying propellers. It is carried up by a larger aircraft or drone and released, then spins down to the water.
It sailed on its own for about three hours in one field test, and the team claims a possible range of more than 100 km.
A seven-person engineering team at the Singapore University of Technology and Design, which published the work in Science Robotics.
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