As parcel-slinging delivery drones inch closer to reality, one cannot be blamed for wondering: what if one of them loses control and falls on my head? Researchers in Nanyang Technological University (NTU) in Singapore had the same thought. So, they decided to conduct a large-scale study and find out how badly a certain amount of weight falling from a certain altitude can hurt a person.
Their modus operandi? Crash drones on a dummy head.
A 10-person strong team took drones weighing between 1kg and 9kg and dropped them from heights ranging from 3 meters to 15 meters. A staggering 600 drones were sent to their graves before the researchers could gather enough scientific evidence they believe can help government agencies come up with regulations for safe drone operations.
What the researchers found particularly disturbing is that even if a person is hit on the head by a drone weighing as less as 250 grams, flying 61 meters above the sea level (a limit for which you don’t even a permit in Singapore), it could prove fatal. This means it would certainly not be advisable for commercial delivery drones to operate in open areas. A trajectory that follows covered pathways or top of buildings would prove to be safer for such operations.
Here’s a video showing NTU’s footage of the tests it conducted. Get prepared to wince:
However, a research conducted by the Federal Aviation Administration (FAA) earlier this year doesn’t seem to agree with NTU’s findings. The FAA has concluded that a UAV falling on a person’s head will cause less damage than a piece of metal or wood debris of the same mass. For example, that study said that if a DJI Phantom 3 drone weighing 1280 gm falls on your head, you have a 0.03% chance or less of getting a head injury. In contrast, if a block of steel or wood of the same weight fell on you, your risk of head injury goes up to 99%.
The results NTU’s research will be presented at the AIAA Science and Technology Forum and Exposition in Florida in January 2018, the Straits Times reports. While we wait for a conclusive study to make up our minds about how safe to feel with drones flying over our heads, read about the technology NASA is developing to help drones crash-land safely during emergencies.