Tag Archives: Quadrotor

Multirotors fail safe things…

Recently we have been seen many multirotor platforms (e.g. quadrotor, hexa rotor and so on) from amatuer classs for hobbists to research level.
What if a quad loses power at high or one of props/motors is malfunctioning in the air?
Have a read the followings.

Warning!! These attempts are illegal.

What happens when a quadrotor loses power a few thousand feet in the air and plummets back to Earth? I have no idea. You probably have no idea. But someone has a very, very good idea, because they’ve done some experimenting. RcTestFlight built a quadrotor, slapped a camera on it, sent it up to over 4,000 feet (1,220 meters), and then cut the motors just to see how it fared.

Quadcopters, like anything else, tend to fall like rocks when they lose power in the air. Unlike rocks, however, they have props, but this isn’t necessarily going to save them. When unpowered and falling, the props spin in the opposite direction as they’re supposed to, which does sometimes add a bit of lift and stability (this is good), but can also prevent the motors from being restarted (this is bad). And larger props seem to offer greater lift at the expense of passive stability. I love the idea of those passive flaps, but what I really love is that some guy just decided that he’d figure out what happened to quadcopters in free fall, and then went out and actually did it. We salute you, Mr. RcTestFlight guy. Well done.

Also, we should mention that doing this is almost definitely illegal in the United States, since you’re not supposed to exceed 400 feet (122 meters) with a quadcopter. So if you try this, be safe and don’t get caught. And then send us video.

The bold new world of flying robots

Screenshot from 2013-03-10 18:49:39




(CNN) — Professor Raffaello D’Andrea isn’t short of admirers for his autonomous flying robots and the amazing tricks they perform.

Every week, he receives a flood of e-mails from excited people telling him how to use them, he says.

“Folks have contacted me about using them to deliver burritos and pizzas, paint walls, do search and rescue, monitor the environment, flying cameras for movies … It’s just endless,” D’Andrea says.