While studying failure modes for quadcopters, and how to get them safely to the ground with less than a full quad of propellers, a group of researchers at the Institute for Dynamic Systems and Control at ETH Zurich came up with a great idea: a mode of flight that’s like the controlled spinning descent of a maple seed.
The Monospinner runs on the absolute minimum number of moving parts. Namely, one. Even a normal helicopter has a swash plate for adjustable blade pitch, and a tail rotor to keep it from spinning. Give up the idea that you want to keep it from spinning, and you can achieve controlled flight with a lot less. Well, one motor and a whole lot of math and simulation.
The Monospinner is carefully weighted so that it’s as stable as possible while spinning, but so far it’s unable to spin itself up from a standstill. In initial tests, they attached it to a pivot to help. The best part of the video (below) is when the researcher throws it, spinning, into the air and it eventually stabilizes. Very cool.
There’s an academic paper on the general idea, so you can get started with the number crunching. Our guess is that getting this thing to fly is non-trivial in the extreme. So kudos to the ETH folks for getting it (to stay) off the ground.
Thanks [lluki] for the tip!
Wasn’t there a drone based on a boomerang with one motor, spinning so fast that you can’t see it by eyes?
Nope it has two motors.
But what I suggested to colinfurze, was a monocopter with his pulsejet…
You mean a tip jet?
https://en.wikipedia.org/wiki/Tip_jet
He’s the man for the job.
Kind of, but more like:
https://en.wikipedia.org/wiki/Monocopter#/media/File:Gyrocopter_by_Papin_and_Rouilly_1914.jpg
I believe you are thinnking of https://www.youtube.com/watch?v=5LqSWiatV0Q
No, but: The phantom sentinel UVA boomerang
[youtube https://www.youtube.com/watch?v=WSslxXutL14&w=420&h=315%5D
Why not add an air foil to one side of the thing and take advantage of the rotation about the middle to generate additional lift?
Already did! A few years back a project was posted that was called the monocopter: https://www.youtube.com/watch?v=u23Hqq8QbeE
Its better in that is uses lift, as well as can self start from stopped on a hard surface.
I thought I saw that before from U of MD (my alma matter).
There’s a little cheap plastic toy my mate got a few years ago, was like that. A tiny little UFO shape, with a copter blade on top. The body also had some wings on it. So both parts spun, in opposite directions, and gave some sort of lift. It had infra-red remote control, can’t remember what control you actually had though, whether it was just up / down.
I had one of those I think:
http://www.geekalerts.com/u/flytech-bladestar.jpg
From what I recall, it could move forward, back, left, and right. It knew which way was forward by sensing which direction the IR signal was coming from and timing the throttles of the two motors at the wing tips so it would fly away from the IR beam. Same principle for all of the other directions.
It was a cool toy, but it (or I) was quite feeble at flying and had to be retired due to crash damage.
I couldn’t control that thing for the life of me. And it really, really hurt when you got whacked by it.
Ah, no, one I’m thinking of is much cheaper and nastier. Yours looks cool though! Must weigh almost nothing, those little rice-grain motors powering it. Very impressive it could do direction, must be some fast reactions.
So, could you use this in airdrops? Agriculture? Combat? I’m trying to see a use for this – despite the fact that it’s hella cool. Also – zero moving parts? How on earth can you get ‘solidstate’ flight?
With an ion engine. Over 10 years ago so called “lifters” were a hit on the internet. Everything you need to build one can be bought at the supermarket. Except for the ~30KV power supply…
Festo did it-
https://www.youtube.com/watch?v=P7FENAXuHIY
I remember when it came out. It was cool yet somewhat eerie to watch it fly..
https://www.festo.com/net/SupportPortal/Files/344798/b_IONIC_Airfish_en.pdf
To learn how to have at least some control in case you damage a traditional x-copter thing…Would definitely make combat x-copter drones a lot harder to “kill”.
A Rogallo based hang glider has zero moving parts.
So does a paper airplane. We’re talking about sustained flight here.
have they seen this :
https://www.youtube.com/watch?v=aEPf0QHVuMM
two motors > one motor. ಠ_ಠ
It also works with one motor, and the creator of that particular (ingenious) innovation has also done research on passively stabilizing single motor copters using inertia and the form factor of the frame itself. It also appears far more responsive to control input than this thing.
I want to see this built into a replica of the flying camera drone in the Tom Selleck movie “Runaway”.
it’s absolutely brilliant! the only thing left to do is to engineer a drive system that accepts a constant input but is geared for the specific delays it needs to avoid flopping over.
Hi grandpa, no one does that any more. Why bother with expensive complicated mechanical system when $3 in electronics achieves same goal with dynamic control.
Wow, bitter much?
Not everyone thinks or engineers the same way you do.
Why not just have it take off from a lazy susan?
Yeah, it only needs 1 rotor, and an imaging system along with razor-sharp blades. Manhacks.
http://vignette2.wikia.nocookie.net/half-life/images/4/4b/Manhack.jpg/revision/latest/scale-to-width-down/270?cb=20090527003317&path-prefix=en
Reminds me of a joke: What do you call a boomerang that doesn’t come back? A stick.
Need some pretty serious research into seasickness before they scale it up I think.
wasnt there a team that builds the same feature to recover a quadcopter if one or more blades brake?
the only bad thing there was it always need the motion capture system like this one too
what happend to them ?
Here’s sorta-the-same-thing-but-different toy version that’s on the shelves.
https://www.youtube.com/watch?v=_hRznwGBfCw
Less control = more fun.
I want one.
NASA at one point proposed the “Samara Camera” – think of a spinning maple seed with a camera taking 360° images as it rotated downward through the atmosphere. There was a central camera hub and a single lateral sail to slow it down and cause it to rotate/scan.
I can’t find any reference to it now, and I realize that it wouldn’t be self-sustaining, but…you wanted simple.
That last comment has me scratching my head…how on earth do you design a controllable flying machine with no moving parts at all? Some kind of Ionocraft based control?
a flying machine with zero moving parts…. the hot air balloon.
and this: https://www.youtube.com/watch?v=sbuGCgc-JCM
This is brilliant.
Look out, that microcontroller is getting dizzy. I think its gonna barf
Boy I’d hate to be hooked up to the FPV system mounted to that thing!
A quadcopter could well be flown within 3Km(2 miles) of an airfield if they are above 17 years of age(but there are arguments who is above 17 years of age in possession of a quadcopter – perhaps why police are so slack at taking them away…hmmm)
Drone Quad-copter flight control demo – Legislation (What they didn’t tell you) !
https://www.youtube.com/watch?v=S3Z6AlzuDYs
Australian news article…”regulation needed as drones threaten planes”…
http://www.theaustralian.com.au/business/aviation/regulation-needed-as-drones-threaten-planes/news-story/484fdd80a887fa52cfc14e9e404859ff
In basic terms, there are actions that can improve quality of life with equipment such as these smaller drones e.g. Tarantula X6 with FPV but the only problem is its all the same to a legislator(e.g. bees and stingless bee species)..
original cartoonist (US gun debate)
http://www.acting-man.com/blog/media/2015/06/Cartoon-Liberty-721768.jpg
modified cartoon -( Australia – Britains Commonwealths)
Note: To attempt to obtain or possess a bullet proof vest in these countries is a serious offence
http://www.windsolarhybridaustralia.x10.mx/Cartoon-Liberty-PLUS-721768.jpg
Holy hell, that is one of the crazier things I’ve seen… it moves through the air with all the grace of a flying hammer. lol!! I never would’ve imagined that something making such a crazy eccentric motion could sustain flight for any length of time, let alone HOVER!
It’s not a hammer but an axe, kind of:
[youtube https://www.youtube.com/watch?v=ft6whAmezZY&w=560&h=315%5D
Two moving parts. The big rotor (the main structure which looks like it spin s off center with an angle of attack that provides some lift) and the propeller or small rotor running counter to the big rotor. If you change the frame of reference to on-board you get bigger moving parts – the small rotor and the Earth spinning about 100 RPM.
Not to be that guy, but samara wings are not a new idea. They have been used in smart munitions, for example, for years to steer bomblets toward detected targets. For that matter, it’s the failure mode of a helicopter, and why they don’t plummet to earth after engine failure.
A.K.A. autorotation?
Technically no, when a helicopter looses engine power but still has all the controls, it just has to adjust the counter-torque…it will descend no matter what the pilot does, but it can do in a controlled manner and if it has the space, can usually land intact.
Loosing the counter-torque ability however, is quite a different story…
Looks neat, is it USEFUL?
What’s the maximum number of propeller a quadcopter has? Please, let me inform if any one knows it. Thanks in advance.