Potentially life-saving drone features edible rice-cake wings

Potentially life-saving drone features edible rice-cake wings
The prototype edible-wing rescue drone
The prototype edible-wing rescue drone
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The prototype edible-wing rescue drone
The prototype edible-wing rescue drone
In its current incarnation, the drone's wings provide about as much food energy as a single serving of breakfast
In its current incarnation, the drone's wings provide about as much food energy as a single serving of breakfast

Imagine if someone such as a stranded mountain climber needed food, but could initially only be reached by drone. Scientists have developed a proof-of-concept system of getting that food to them, in the form of a drone with edible wings.

First of all, there are already various groups using multicopter drones to deliver packages of food from stores or restaurants to clients' homes. Why not just use one of those?

Well, while such drones have enough battery range for use within cities, they might not be able to cover the long distances that would be involved in getting food to people lost at sea, in the wilderness, or in other remote locations. A longer-range fixed-wing drone would be better for that purpose, although according to scientists from Switzerland's EPFL research institute, commercial models can generally only carry about 10 to 30% of their own mass as a payload.

In an effort to increase that percentage, an EPFL team led by postdoctoral researcher Bokeon Kwak set about designing a fixed-wing drone that was actually partially edible. And no, it wouldn't be reusable – it would make a one-way trip to the person in need, providing them with sustenance until they could be reached by rescuers.

The scientists focused their efforts on the wings, as they usually occupy the largest volume on a fixed-wing drone. If providing food weren't an issue, those wings would normally be made of a light but strong material such as expanded polypropylene (EPP) foam. After some experimentation it was decided that puffed rice cakes provided a good edible alternative, as their mechanical properties are similar to those of EPP.

In its current incarnation, the drone's wings provide about as much food energy as a single serving of breakfast
In its current incarnation, the drone's wings provide about as much food energy as a single serving of breakfast

In order to build the rectangular wings, the puck-shaped cakes were laser-cut into hexagonal pieces, which were then glued together along the edges using an edible gelatin. Corn starch and chocolate were also tried as adhesives, but the gelatin proved to be stronger. Once assembled, the wings were covered in a removable non-edible plastic, to protect the rice cake material from humidity.

The resulting model has a wingspan of 678 mm (26.7 in) and it does indeed fly – at a speed of 10 m (33 ft) per second – and carries 50% of its own mass as an edible payload. Additionally, the researchers estimate that it could carry 80 grams of water in an onboard container.

Its two wings pack a combined 300 kilocalories of food energy, which is roughly equivalent to one serving of breakfast. Needless to say, a larger version – or multiple smaller drones sent to one location – could provide a greater amount. Further research will focus on making more parts of the drone edible, and on boosting the nutritional value of the edible material.

"Until now, the amount of food that existing drones could carry was restricted to the payload," the team stated in a paper that was presented last week at the IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) in Kyoto. "However, an edible drone can distinctly overcome this payload limitation, owing to the recreation of some body structures with food materials."

Source: EPFL via IEEE Spectrum

Are we assuming that the rest of the parts can be reused once the person is rescued, so that this solution comes out better than a payload-carrying drone making multiple round trips to deliver the same food while using up only electrons?
"But how does it taste?"

"Kinda plane..."
@kwalispecial. LOL
Bob Flint
Assuming it makes it to the person in need of rescue, munching on drone wings does not immediately come to mind, and if by chance ones does connect with this device, does eating it trigger a response team to the exact location, of snack, assuming an animal does get it first.....
Paul Anderson
Looks like a sure thing to win an Ig Nobel prize, but what category?
So, this little drone is going to brave the high mountain winds (or a blizzard) and fly right to the victim on the mountain? Good luck with that, scientists. You forgot the critical parameters of the trip in your design equations.
@kwalispecial Ouch!
Gregg Eshelman
Lost person: "But I'm allergic to rice!" *dies of hunger*

Caramel popcorn cake wings would be a good thing to try.
needs more thought, if all it is delivering is a one person breakfast, not near enough, they could last another day either way, need to up the ante, bigger motor & battery & prop & make it a wider wing version that is thicker, but still use lighter dehydrated meat for much needed protein, etc. People lost at sea do not tend to be alone I don't believe, unless the other died & turned into shark food.