perfect-physics. can this really be done, has science gone to far.. I tried to recreate and it didnt work. Also...got the paper airplane stuck in my pee hole. I'm currently on my way to the hospital. science went to far
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What do you think? Give us your opinion. Anonymous comments allowed.
#4 - Rascal (02/16/2013) [-]
There is a fishing line holding it up. I've seen this one before :<

User avatar #5 to #4 - TheDLT (02/16/2013) [-]
Uh no, you can easily do this yourself with two fans
User avatar #10 to #5 - iskandersa (02/16/2013) [-]
no anon is right, steve spangler has shown this on youtube you need the fishing line to hold it up
User avatar #15 to #10 - masterbob (02/16/2013) [-]
or you could actually do it.
User avatar #18 to #15 - iskandersa (02/16/2013) [-]
holy mother of god, blastwave spoon, nice picture man that was my background for a while
User avatar #17 to #15 - iskandersa (02/16/2013) [-]
but who has the time to get up and do stuff, no i think i will stay where i am and enjoy my peace
User avatar #13 to #4 - ekwaqfeo (02/16/2013) [-]
I knew something fishy was going on
please don't hurt me
#52 - zachloweth (02/16/2013) [-]
Comment Picture
#2 - johnpoppy (02/15/2013) [-]
Damn it! Dave broke physics again.
User avatar #3 - pompladouche (02/15/2013) [-]
I tried to recreate and it didnt work. Also...got the paper airplane stuck in my pee hole. I'm currently on my way to the hospital.
#11 - renegadejack (02/16/2013) [-]
here have another
here have another
#25 to #11 - pimpinpenguin (02/16/2013) [-]
perpetual motion is possible
perpetual motion is possible
#26 to #25 - pimpinpenguin (02/16/2013) [-]
and
and
User avatar #35 to #25 - mrwalkerfour (02/16/2013) [-]
thats not perpetual motion the fans are not sustaining themselves therefore a soon as they will eventually run out
#32 - doddythechef (02/16/2013) [-]
if this were to happen the plane would drop due to gravity as neither fan is causing up draft to lift the plane. the two fans would cancel eachother out   
   
but still looks cool
if this were to happen the plane would drop due to gravity as neither fan is causing up draft to lift the plane. the two fans would cancel eachother out

but still looks cool
User avatar #34 to #32 - semilunarknight (02/16/2013) [-]
Yup, even further the two meeting air currents would cause random air circulation that would never allow it to remain so stable
User avatar #21 - anonymoose ONLINE (02/16/2013) [-]
This can't be done. Look at the clouds below the left fan, there's a suspicious edge that makes the left fan look shopped in.
User avatar #54 - teevee (02/16/2013) [-]
GUYS, IT'S JUST A STRING.
#37 - throwspooatmonkeys (02/16/2013) [-]
No. This kind of balance is nearly impossible to achieve. It may be possible with specialized equipment; position sensors, fans that employ cowling and other **** to make a laminar air flow, and a fast(ish) microcontroller working as a proportional/integral/derivative math machine, outputting signals to servos controlling cowling direction (2d) and fan speed. The original source of this video employed "invisible string", available at any magic shop.

~source~: I'm a god damned engineer.
User avatar #55 to #37 - laminar (02/16/2013) [-]
tfw mentioned in a comment
User avatar #39 to #37 - oceanmist (02/16/2013) [-]
Also as an engineer, I want to say you took this as complicated as it possibly needed to be. You could have just said that the drag would pull the plane to the left. Even all that equipment wouldn't stop the drag. The best engineers are always the laziest when it comes to solving problems.
#42 to #39 - throwspooatmonkeys (02/16/2013) [-]
OK... OK... I'll admit it. I'm an EE, but I still know a thing or two about fluid dynamics (I has dead millwright father). You're totally in line by slapping me in the face with Occam's razor. I know I could have put my statement more simply; stuff like the original post creates not only a vacuum for my faith in human intelligence, but also my will to finish this messa......


There's a lot of us engineer folk here. S'weird...
User avatar #44 to #42 - oceanmist (02/16/2013) [-]
All the good engineers are on the Internet, cause they're lazy. Also, to be fair, I failed dynamics and changed to Computer science so I didn't have to take it. I really hate math without numbers.
#45 to #44 - throwspooatmonkeys (02/16/2013) [-]
It's friday, night here, so I'm allowed to be on the net, as I don't have to work in the AM. Just so ya know, fluid dynamics has a great deal of math at it's disposal to solve problems. If you've ever seen the Greek lambda symbol in an unfamiliar equation, but upside down, then.... yeah... I suck at language.

It's called vector calculus. No big whoop.
#40 to #39 - dkolega (02/16/2013) [-]
you just need to tie the damn thing to the right fan

i might be an engineer in a few years
User avatar #41 to #40 - oceanmist (02/16/2013) [-]
Yup. Do it fast, cheap, and with no effort and NASA will be calling
#46 to #41 - throwspooatmonkeys (02/16/2013) [-]
It really wouldn't be that hard! If you know what laminar flow is and how to create it, how to direct airflow with any of the standard NACA (no, I didn't misspell that) and if you can properly implement a PID controller for this purpose, I don't see why it couldn't happen. Of course, the rig would probably have quite a few more fans, and be in an enclosure, but whatever... Anything is possible, right?

#48 to #46 - dkolega (02/16/2013) [-]
dude, just tie the damn thing to the top of the right fan and it's all done
#51 to #48 - throwspooatmonkeys (02/16/2013) [-]
Hmmm.... If you can design a paper plane with a single 11*8.5" sheet of paper with a single 1.5' string that will remain stable behind a fan like the the ones we saw in the gif, the I, sir, will bake a cookie in your honor, and spend no less than 4 hours creating OC dedicated to you, to be posted on FJ. I will also mail you the cookie (US or CA only)
#47 to #46 - throwspooatmonkeys (02/16/2013) [-]
For the record, AC and RC jets on all space fairing rockets and most military equipment employ PID systems, so it's nothing new. In fact, PID controlled items are almost everywhere, from expensive vacuums, to... whatever... I'm tired of this **** .

#50 to #40 - throwspooatmonkeys (02/16/2013) [-]
Good for you? What discipline?

I know many people that went to "engineering school" for YEARS before they found out it had nothing to do with trains.

WOOO WOOOOOOO!!!!!! (chuga chuga chuga chuga chuga chuga) WOOOO WOOOOO!!!!!
#43 to #40 - throwspooatmonkeys (02/16/2013) [-]
You would also need to tie it to the left fan, or some other object perpendicular to or to the left of the normal axis. Try it if you need to. If you just tie it to the right fan, the plan would go all floopity-floppity and crash out of the air flow.
#33 - willindor ONLINE (02/16/2013) [-]
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User avatar #36 - Nightinear **User deleted account** (02/16/2013) [-]
This was fake
#38 to #36 - throwspooatmonkeys (02/16/2013) [-]
It sure was. See comment #37 for what I think is a decent explanation.
User avatar #9 - spoogle (02/16/2013) [-]
I think this is impossible. Maybe something to do with how perpetual motion is unachievable.

Also, the .gif is fake. The fan on the left seems to have been shopped in somehow. See the line in the clouds a few cms to the right of the bottom of the blades?
User avatar #12 to #9 - allexzander (02/16/2013) [-]
This is real and can be done. Try it if you have 2 fans and enough patience and you will succeed.
User avatar #22 to #12 - anonymoose ONLINE (02/16/2013) [-]
There is no force pushing it up, but gravity would still be pulling it down. Not possibl
User avatar #28 to #22 - allexzander (02/16/2013) [-]
Bernoullis principle crates an upward force due to different pressures. This gif is fake, but it actually can be done, you just need plane with right wings.
User avatar #29 to #28 - anonymoose ONLINE (02/16/2013) [-]
I disregarded the possibility of an upward force being created since it's only a paper aeroplane.
User avatar #30 to #29 - allexzander (02/16/2013) [-]
You can make paper airplane with curved wings....
User avatar #16 to #9 - SteyrAUG (02/16/2013) [-]
But this isn't perpetual motion. There is a power input (the fans) which cause lift forces and cancel each other out in the x direction. It's not impossible, just difficult.
User avatar #53 to #9 - teevee (02/16/2013) [-]
dude... it's just a string.
#6 - Rascal (02/16/2013) [-]
wow totally fake. look at how slow the fans are going, ******** . there probably wouldnt be any air at all.
#31 to #6 - drewsky (02/16/2013) [-]
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User avatar #14 to #6 - masterbob (02/16/2013) [-]
i hate you for this. i honestly do. you are at the top of my **** list.
#7 to #6 - juffs (02/16/2013) [-]
I.... Please tell me you're not being serious.
User avatar #19 to #8 - funnyrage (02/16/2013) [-]
lets hope for the first one.
#1 - unsane (02/15/2013) [-]
Indoors it might, this one is fake
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