tomatoboy
139570
2132
24
POV of main helicopter rotor blade in flight
Source: https://youtu.be/Pu48f7s5Ru8
Sep 24, 2020 2:25 PM
tomatoboy
139570
2132
24
Source: https://youtu.be/Pu48f7s5Ru8
xuumo
Doesnt seem to be going very fast
DrDadJokes
certainlynotaserialkiller
jaloosk
?????
AvgWhiteShark
purdhapley
MikeAracter
FBKatB3tadotcom1
New Wesly Snipe film for the Blade franchise
DrDadJokes
abazoe
I didn’t realize my motion sickness was so advanced that it could be triggered by a video...
EvanStageTech
oh god oh man oh god oh man oh god oh man oh god oh man oh god oh man oh god oh man oh god oh man oh god oh man oh god oh man oh god oh man
Noctourn
I use this video when teaching flight in science
MisterSmithster
TacoFox
I can't tell if there is spaghetti on that safety also its not tight enough...look at that light underneath it.
8BitFish
chevymonster
This is from the original Disney movie "Escape to Witch Mountain".
rigello
Copperbrat
Eyesotope
MikeAracter
YouLearnFromYourMistakesSlowerThanYouShould
WieruZ
Is.. is that.. Will Smith’s son?
RustyDoorNail
wolfspirit21
Where's this from?
SuperBeetle76
I wanna say it’s early jaden smith but I don’t think I’m right.
KonamiHatchiborii
.
Larkins
https://www.youtube.com/watch?v=PGNiXGX2nLU&ab_channel=DeadOrAliveVEVO
CynicalEuropean
Huuuggruhhh - puking noises increase
tygerpsimatrix
theimgurappsucksballs
WhatUpDog3000
NordMan
https://youtu.be/9WMrp1MO8BE You welcome
AllTheGoodOnesWereGone
We're all having a collective hurl with you.
battery1979
BLUUUUURRRRRGGHHH!!!!
TheInfiniteUnknown
SexyYoda
i imagine it going weeee oooooo weeeee oooooo in its head(the blade or rotor or whatever it's called)
TurnThisShpAround
Gayforbae
Torsun
The worst part is the chewing...
DrDadJokes
you fucking gross. +1 so everyone sees it.
carkuffb101
Nooooooooo. Wtf
TemetNosce000
Ughhhhh
checkyourprostate
tomatoboy
Note: this is a slow-mo. Video description says slow-mo recorded at 240fps and played back at 30fps.
Trentski
Slower you slut
justsomeinternetperson
Never seen this before, Very cool.
darkadept
You spin me right round baby, right round.
MajorPoopyPants
The thumbnail of this on the front page made me a little bit nauseated. Flashbacks to early 80's playgrounds...
Skan735
I want to live like those vibration dampeners. Jivin' like it ain't no thing
relpmeraggy
Schoonbot
What's this from
OrdinarilyBob
Galaxy Quest. Great movie. Highly recommend.
ProperPlanningPreventsPissPoorPerformance
Which one is the "Jesus" bolt?
AnalSexInTheWoodsDontMakeBabies
The one in the center. You know... The one where you meet him if you lose it.
ihavethelowground
Jesus but. It's in the center of the hub
sickburn
Jesus butt? Jesus nut. Jesus bolt.
ihavethelowground
Ducking autocorrect
SPCNewbie
ya it would behind the cameras pov
manWithNoHands
mr5fir
Stealing this
mr5fir
Stealing this
DiracsDelta
What are the two black balls that look like they are bouncing?
waspinatorrulez
Mr. Marcus's side gig.
coolranchchips
'Cause the same people that tried to black ball me
Forgot about two things, my black balls
xtitox28
They are pendulum vibration absorbers and help to reduce vibration among the rotor system. So says the interwebs.
AdrianMole
Thanks!
rashio93
Any Captain here to explain the wobblying? Is that just mechanical give or is there an advantage to letting it go up and down like that?
rashio93
Thanks for all answers peeps!
sickburn
Rotor blades lead, lag, flap, feather, and flex. The entire rotor system is also a gyroscope. It takes a lot of movement to conquer things
sickburn
like dissymmetry of lift in forward flight.
colinz1234
Iike the flexing wings of an aircraft, the blades need to be flexible otherwise they would break.
Mineraleater
By pitching the blade the corresponding lift angle, thus the direction of thrust can be changed. Any flight direction is possible this way
whenthewestwindblows
I haven’t seen someone call for a captain in a while!
IDontGiveASchmeckle
Aerospace engineer here. Pitch is being adjusted, depending on if the rotor is going forward (high wind speed = high lift) or with it (lower
IDontGiveASchmeckle
wind speed = lower lift). To have an equal lift distribution it changes the lift by changing the angle of the rotor. also for pitching the
IDontGiveASchmeckle
whole helicopter
IDontGiveASchmeckle
I might be intoxicated and I might have used rotor instead of blade at some point
sickburn
Dissymmetry of lift is countered by flapping- this rigid rotor flexes the blades up and down for that. The pitch chg is cyclic feathering.
ihavethelowground
The blade or the spherical things. The latter are dampeners to reduce vibration
1LostPuppy
Are you talking about those black bouncing balls??
baronnapalm
Scrolled for this. I was wondering about those. Makes sense
aCartoonMonster
I have the same question. All the answers are talking about collective pitch. Stable rpm and the rotor pitch changes lift. But that 1/
aCartoonMonster
Should be pared with linkages that move the whole rotor assembly for changing direction. Wobbling back and forth to my knowledge is not 2/
aCartoonMonster
A thing. I believe that the pitch is being changed a little then the gif is repeated. If someone has more info let me know.
TheFishFace
When the blade points up it generates lift. When down, it doesn't. By changing the angle as it rotates, lift is generated only in one part..
Flyingwigs
And if they go down enough, you can fly upside down. 3D helicopters are a hoot to fly
TheFishFace
Which makes the craft as a whole rotate. This changes the angle of force from the rotor, allowing the craft to move more than just up and...
TheFishFace
Down. This is controlled by the cyclic via the swashplate
Muschifurz
Cyclic pitch control of the rotor, it controls the lift on different sides to make the helicopter change direction
SLSrocketscientist
Also keep the vehicle level during straight flight. One side would produce more lift due to relative air speed so they change AoA to counter
SchizophrenicEuphoria
okay but what are the balls
leaveittochance
It's a boy helicopter.
LexiClarke
They’re little dampers that help counteract vibration.
Trastion
It's where the pee is stored.
Flyingwigs
Upon release it shoots out the ends of the rotor blades
chut7
I took me a while to be convinced that this actually happens. Impressive engineering to adjust pitch 8 times per second.
BrunoFI
I thought the blade angle adjustment happens continuously, not every 0.125 seconds. It used to be wires and levers and discs
chut7
What do you mean by continuous? My basic brain thought that if the blade spins at 8 per second, then that's the frequency of the adjustment.
BrunoFI
Imagine there is a disc attached to the rotor axle. The disc can be tilted left, right, forward and backwards. That adjusts rods that 1/2
CouldCareLessButDoesnt
Seems like it should be going way faster
NapoleonDynOmite
Seems like about 60 or 70 rpm. Gotta be slo mo
bluerazzgummy
4x slow.
GoongalaGoongala
The YouTube video description says it was filmed at 240fps and played back at 30fps.
joh775
Notice the leading edge has a dark strip. As I recall this is a plastic film. The same stuff that is used on cell phone screen protectors.
SoundKraftS2
I agree
creepwood
Most helicopters have a rotor revolutions per second of 8 turns, you would think it would be much faster
necrojoe
It is. It's 1/8 speed
MarkWatneysVicodinPotato
The g forces at the end of the rotor blades are incredible. You wouldn't want it to rotate much faster
truthsmiles
Well I would, but that’s because I like to see things break.
MarkWatneysVicodinPotato
I've talked to people who ran destructive swashplate testing in a pit in the ground. It was supposedly amazing
[deleted]
[deleted]
greatcanine
J B Weld fer sure
Bomboque
If you stick the camera above the rotor hub there is very little force on it no matter how fast it spins.
TakeTheStairs
it was flying really slowly
TeddyMoment
The YouTube video description says it was filmed at 240fps and played back at 30fps. So yeah, slow mo.
DrLOAC
I get 1 rev / 1.12 sec. That’s ~53RPM. multiply by 8 (240fps/30fps) & we get 425RPM. Google says small helicopters spin @400-500. Checks out
Garett
I can’t believe it doesn’t need to be faster
Geek13
At the tip of that blade (20 ft estimated) the tip travels 125 ft every rotation. 425 rotations per min = 900 ft per second - (1/2)
Geek13
That's only a couple hundred less than the speed of sound. You really can't have the blades breaking the sound barrier.
graehall
I respect those calculations and that research.
RapturetheCity
Video description says slo-mo filmed at 240 FPS and played back at 30 FPS
kodudScifiSmuggler
While all the replies to this are quite helpful, I detect sarcasm
tomatoboy
Video description says slo-mo filmed at 240fps and played back at 30fps.
horseWnoname
:brain cramps:
tomatoboy
It’s slowed down 8x.
Eyesotope
That is at least a fps or two if my math checks out.
purdhapley
So 1/8th speed then?
djayembe
Look at the human calculator over here! Seriously though thank you, was curious but didn't even attempt to math
closhedbb
His name is Brad, and he has a big brain on him.
tomatoboy
Yup.
Musklim
So, actually it's spinning just times per second?. I was thinking rotors would do many more revs.
trogdor9000
At 8 rotations per second, that's roughly 480 RPM (rotations per minute) which is about right (average is 400-500).
Kyrorayne
Someone upload this at 8x's speed
tomatoboy
I think the desktop version of YouTube can change the playback speed.
tomatoboy
I think the desktop version of YouTube can change the playback speed.
AmorHudd
small rotation of the blade is to balance the force generated by the advancing(against wind) blade vs retreating one.
catrov
No. Blade pitch changes as it goes round to raise one side, lower other. Lower nose, go fwd. Raise right, roll to left. Called 'cyclic' ctrl
catrov
by pilot. Can tilt main rotor in any direction. Is primary directional control in helicopter...
DocHarriers
Thank you. I was going to comment to ask about it.
AmorHudd
Asymmetry of lift. It's cool look it up.
ihavethelowground
*Dissymmetry
AmorHudd
Kudos.
sickburn
Dissymmetry of lift is dealt with by blade flapping. It sounds more like you're talking about the cyclic feathering visible.
AmorHudd
Periodic change of attack angle of the blade doesn't help with that? I knew that flapping contributed a lot but didt know it was enough
sickburn
Swashplate input is what produces pitch change; some systems have feather dampers with lets the pitch wobble a bit but flapping = DoL.
sickburn
See that PC link is rigidly mounted to the hinge, so the only way for it to ride up and down with pitch change is by swashplate input.
sickburn
And swashplate input doesn't know if the helicopter is in translational flight or not to need DoL correction.