<![CDATA[Japanese Astronaut's Space Boomerang Came Back - Gizmodo Comments]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back - Gizmodo Comments]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> For the people that think that the upward force should make it hit the ceiling.....there is no up in zero G. The force would "push" it based on the axis it was thrown. And since it's assymetrical shape changes it's axis as it goes through the air....well, if you dont' get the rest, my explanation isn't going to help you.

keith4298

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> I would love to see what happened to a boomerang with in microgravity with nothing to hit. I would expect a very complex result rather than a figure eight or a circle. Get on that NASA!

The simple explanation for why it works is that it's in freefall when you throw it on earth too.

Ben Zvan

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @brian1cj: Im sorry but for something to stay in motion has to have no force acting on it. However a boomerang had a constant force against it, its the air that it flys through. The air causes resistance as well as the lift that is needed for it to fly and eventually return to its source. The only way that i would continue forever would be in an absolute vaccum and nothing else to run into. No friction is what is needed, however in this type of situation the boomerang wouldnt act like a boomerang at all. It would just float straight in the direction it was tossed in.

yajusdono

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> So if a boomerang's flight pattern is the same in space, would it ever stop? Im no physics guy, but don't objects in motion stay in motion until acted upon by another force which is usually gravity? Since there is no gravity, would it just fly in a circle pattern forever or until it hit something?

brian1cj

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @TomXP411: I know that...and also that's the single biggest limiting factor in a heli's top speed. Retreating blade stall. Very, very bad effects.

shenanigans61

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @aec007: I dont think you understand the idea behind rocket propultion and lighting it. Yes it would light, probably explosivly because I believe their is a higher ration of Oxygen in space station air. Also, you would get negligable propulsion because Rockets propel via balance of momentum. The light air shoots out the back really fast, so the heavy rocket moves forward not as fast in order to balance the net momentum.

xanderjanz

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @csgoat: They get material shipments for food, water, and labs (like this) quite often. Thats why its an International station, even when one nation lowers support other countries like Japan, Russia, and others are still feeding them with stuff.

xanderjanz

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @CColdsmoke: Ummmm What does working in space have to do with aliens? Aliens would have a homeworld too, which would have gravity.

And I think the reason it works has to do with the difference between orbit and weightlessness. When orbiting the earth on the the Space Station, Earths gravity is still quite strong, approx 75% of at surface. The reason it feels weightless is everything around is falling at the same rate, like of Disney's Tower of Terror how you can hold a penny and it floats when you fall. So gravity is still pulling on the boomorang. We would have to see it work further from the earth to see if gravity effects it.

xanderjanz

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> why is anyone surprised? did we think that there was some magical gravitational pull on a boomerang when we throw it? If for some reason it didn't work that would mean that there was no air in the space capsule and that would be a serious problem for the astronauts.

entropyman

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> I was watching something back then that explained the boomerang. I'm pretty sure you're right about the gravity. Gravity pulls its midpoint to a slant and basically flips it back upside down in the reverse motion to return it to you. Or something along those lines. Could it be true that we never even made it to SPACE!? CURSE YOU NASA!!!!

Mr_LaZy

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> we really need to look at the appropriate question. How did the boomerang get to space. If he made one, how did he make one in space? I call HOAX!!! Where did the boomerang come from? that is the true question

csgoat

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @shenanigans61: At low speeds (less than a significant fraction of the rotor tip speed), that's correct. But when the helicopter is moving forward as fast as the rotor is turning, what happens to the lift on the retreating blade?

*That's* the effect that makes a boomerang work.

TomXP411

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @aec007: Why has this particular post attracted so many infantile responses?

And if you want an actual answer: no. You need to direct the gases in one direction in order to get thrust. Lighting your own farts will just create a fireball that sits there.

TomXP411

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Juggling, boomerangs, yoyos....

Kid's stuff.

What I really want to know is:
- What happens if you rip a good fart and light it up in zero G.
- Would you get actual propultion out of it compared to not lighting it up?



aec007

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @TomXP411: Sorry, must've missed that in your post. I don't need to "read up" on anything. I've learned enough through physical interaction.

To say that a helicopter's blade's lift is asymetric is wrong, as proved by hovering. To say that the blade's pitch can change to cause symetric or asymetric lift is right.

shenanigans61

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Now we may never know if Bushmen can be trained to sort tiny screws in space...

strider_mt2k

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Does the thought of an astronaut testing a boomerang in space seem like the premise of a Far Side cartoon to anyone else? Maybe that's just me.

Boomerang test: check.
Next up, silly putty test...

Vagabum

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @an1m3fr33k: Actually, hunting boomerangs don't return.
The more you know.

The illest wind

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @TomXP411: Heh. True, and the ISS and boomerang would have to be in the right place in their orbits for the locations to coincide so you could catch it.

Kit Eaton

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @Kiteaton: That's a huge circle! You'd have to wait around for 100 minutes to catch it. ;)

TomXP411

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @shenanigans61: Who ever mentioned hovering? I was talking about forward flight.

Read up on "Mu ratio" and "Mu barrier". Cartercopter.com is a good place to start. HowStuffWorks also has a good explanation of the boomerang. Their assertion is that gyroscopic precession is why the boomerang turns, and it's a perfectly reasonable explanation.

Regardless, the point is that a boomerang's flight doesn't have as much to do with gravity as it does with the interaction of air and the boomerang's shape.

TomXP411

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Boomerang physics: [entertainment.howstuffworks.com]

Boomerang flight path is circular through a combination of lift from the wing surfaces and precession. You throw it tilted at an angle when on Earth to direct some of the lift force in an upwards direction to counteract gravitational force. In zero-g (technically, microgravity) you wouldn't need this tilt and the boomerang would go in a neat circle. Cool... the experiment worked!

Thrown in the vacuum of space outside the ISS it would just spin off, and end up in a different orbit of its own around the Earth, depending on how much delta v you'd given it. Physics is cool :-)

Kit Eaton

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> OK. First if you made small boomerang out of thicker paper, it can have diameter of flight under 2m.

I think boomerang uses allso radial force, which is perpendicular to the boomerag which drags it towards the inside and vary regarding mass of the spinning object. while airodynamics gives it momentum.

P.S.
Boomerang is not used just for hunting it's sports discipline. and not all boomerangs have just 2 blades. ther ar many shapes of boomerangs (V(standarrd),Y(trick catch),U(long distance), and many others M,N)

rrwakc

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Looks like NASA is looking into getting some of that Mythbusters money.

klew

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @papaguru: Well, there was a time when it cost less to shoot kangaroos into space then monkeys...

Klappstuhl

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> I'm sure they threw it into the cold, dark space, and a friendly alien throw it right back!

Deoki

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @dantaylor08: thank you i learned something today.

Amiash Loves You

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Dave and the Interplanetary Boomerangs would be an awesome band name.

frndlybnny

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> He didn't throw a returning boomerang - he threw a hunting boomerang. The reason a returning boomerang returns is because of the way the air reacts with it's wings (nothing do do with gravity).

dantaylor08

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> im imagining; if the boomerang was thrown in space, it'll just float and never come back.

Amiash Loves You

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @nutbastard:
It could be outside, ignoring gravity from planets and stars, it would just take a really really long time for it to come back since space isn't a perfect vacuum.


DWD

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> However, my point is that the only "real" (the minute amount of gravity being applied could probably be ignored for the discussion at hand) counterforce to the lift generated by the blades is going to be the aerodynamic resistance (drag) that the boomerang has on its own. With it's low mass, I would think that even a small amount of lift would send it to the ceiling. What am I missing? If the c/d of the boomerang is high enough to replace the force being applied by gravity, how could they work on earth?

With that said, however, I might be answering my own question. The mass of the boomerang is small enough that perhaps the force of gravity is insignificant enough to affect it's flight????

But that just doesn't seem right....

Lets se if we can get World Boomerang Champion Yasuhiro Togai to weigh in on the subject.

sqeakytoy of the apocalypse

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> What they don't tell you is that when in came back, it had crossed though an inter-dimensional portal - that went straight through HELL!

That's why they can't show you the video.

se7a7n7

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @Claystil: Haha you might be right.
Now...space ping pong!


shenanigans61

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @shenanigans61: Actually, I looked again at the photo and you can see that the boomerang is very tiny. Maybe the minute size of the thing combined with his skillz make the toss ISS compatable?

Claystil

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @yogibimbi: ROFL.

bmoctta

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @TomXP411: Uh...wrong.
The lift on a heli's blades are symmetric so long as the helicopter is hovering. If one wants to induce forward movement, however, the lift needs to be asymetric. Along the lines of that, the asymmetry in the blade pitch needs to be 90* before the intended movement (for lack of better words). That is, in order to move forward (providing top-down view counter-clockwise rotation), the increase in pitch needs to be on the right side of the heli, rather than in the back, as you might think.
This is what you got confused on. Yes, the blades change pitch as they rotate due to the swash, but that's only to provide for movement, NOT steady hovering.

Continue...



shenanigans61

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> one occasion for humour lost in the illustration: The Japanese guy should say 'It wolks'...

yogibimbi

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @Claystil: I was wondering the same thing. My vision of the space station is a bunch of tubes barely big enough to float through. Maybe I'm wrong?

shenanigans61

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Oh come on guys... We all know that there is plety of Gravity from the earth on the ISS. How else would it stay in orbit. I would say that the gravity argument only works in inter planetary space where the gravitational force from the earth really is zero.

dallasmay2

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Space-H4x tbh

maximumleo

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Why wouldn't it work? The forces that cause the boomerang to fly in a loop is the resistance of the atmosphere. Gravity just makes it fall down eventually...

Evil_Snow_Man

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Okay, let's not be jerks about it.

The answer is simple, but not obvious, and I can see why he was surprised that it worked. I've spent a lot of time studying flight, so I get why it works, but I had to think about it for a minute.

First off, let's look at a boomerang. It's basically wings, attached together asymmetrically. By spinning the boomerang as you throw it, you cause it to fly much like a helicopter blade.

Now the thing to understand about helicopter blades is that their lift is asymmetrical: the forward moving blade provides more lift than the backward moving blade. This would cause the helicopter to roll to one side if the rotor wasn't specially designed to counter this problem: the blades actually change their pitch as they rotate.

The boomerang, on the other hand, doesn't correct like this, so it will start to roll to the right as it flies. This rolling action causes the boomerang to fly in a big circle, eventually returning back to the thrower. It's also held perpendicular to the ground when it's thrown, so it actually flies off to the left at first, not straight up. As it continues its flight, it will roll to the right, so that its curve straightens out, and if everything works, it reaches the thrower relatively level. Gravity isn't actually a major player anywhere along the line here; the boomerang's own inherent instability is what causes it to return to the thrower.

Now in zero-g, the same effect applies. The boomerang will move "up" (based on its own axis) as it moves forward. It will also start rolling right. As it flies up, the roll continues. Since there's no gravity to speak of, the boomerang will probably end up flying more of a corkscrew motion, but should eventually get back to where it started.

Left to its own devices in a room large enough, I'd bet that it would fly a distored figure-8 pattern, or most of one, before it ran out of momentum.

TomXP411

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> There is a minute amount of gravity in space, which is kinda where the shapes of planets, stars, etc.. come from. This low amount would be enough to give it some stability.. or perhaps its the low amount that gives it perfect stability. Hmm....

DragonleechMage

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @tegronin: You totes should have called this guy, you know, since the conclusion was so obvious. I mean, you could have saved him some time and fun.

I just can't imagine how a guy who has a Ph.d. in aerospace engineering, with specialties in populsion and microgravity aerospace technology wouldn't know these simple facts when you do!

Claystil

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> T'wasn't a roo. T'was a wallerbee, mate.

Sean Harrington

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @Milstar:
Interesting point... but true. I mean, you'd think that we'd all have heard something more on all the tests being done up there. Can anybody with more knowledge than I offer some examples of things that have been learned from hanging out in space other than how difficult it is to pee in zero g??

Keebler

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @sqeakytoy of the apocalypse: Stupid lappy keyboard.... *vertically

sqeakytoy of the apocalypse

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @jetexas: He was testing it on Zero-G, not Zero everything.

AlphaTeam

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @papaguru: to hunt with the boomerang, silly.

zenpoet

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> obvioulsy we aren't fully utilizing the time of persons in space. maybe next time he can blog.

of course a boomerang would work in zero-g, as mentioned earlier it's an aerodynamic issue, not a gravitational issue.

he SHOULD try it on an EVA. maybe it'll come back once it reaches the edge of the universe, or maybe every 75 years like a certain comet.

tegronin

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> i'm amazed that that's what NASA is spending billions of dollars on... just in case we need to go hunting in Zero-G...

an1m3fr33k

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @papaguru: Just look on the tax forms, they had it being deducted as entertainment

sqeakytoy of the apocalypse

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> I would have thought that without gravity to counteract the lift, the sucker wold have just shot to the ceiling... After all, it would pretty much have un-opposed forces, at least verticaly. Thrust and drag would balance, but lift with no weight...?

sqeakytoy of the apocalypse

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Ehm... Why was there a live kangaroo up there in the first place?

papaguru

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Of course it works in the freaking atmosphere of the space station. Try throwing it while on a space walk.

And dear captioner, the Japanese use boomerangs to kill whales, not roos.

jetexas

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Obviously, this proves that boomerangs were invented by aliens.

CColdsmoke

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> wow I'm totally suprised by this!

Oddly this is the only scientific experiment that Nasa has done (probably unoffically but oh well) in decades and billions spent later that I've had any interest in.

Milstar

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> how on space stations is there enough room for boomering tossing?

Claystil

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> @ILikeMacsWhatAboutIT: "No more yankie my wankie. The Donger need food...and a boomarang that apparently works in micro gravity.

tamoko

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> I think gravity just makes it fall. It's aerodynamics that make it curve in the air, since there's still air for it's wings to push against it can curve it's flight path. Or something?

Player4

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Was this outside or inside? I'm guessing inside, since aerodynamics are responsible for giving wings lift, and a boomerang is just a wing (arguably 2 wings)

nutbastard

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Next: do Yo-Yos yo.

P3nnst8r

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Juggling in space would work.

As long as it's the style of juggling where you're bouncing the balls off a wall [or floor or ceiling]...

ideaman2020

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> When it came back, I'm sure he let out a Keanu in the Matrix "woah."

ILikeMacsWhatAboutIT

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> X price?

mrxcel

]]> <![CDATA[Japanese Astronaut's Space Boomerang Came Back]]> Aerodynamics?

Mandatory_Field

]]>