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https://www.youtube.com/watch?v=M5POy9iKtPA Can someone explain this to me? Physics doesn't work like this.
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Oct 1, 2012 20:40
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| # ? May 12, 2024 20:47 |
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The camera framerate is synchronised to the rotor speed such that every time it takes a frame the rotors have completed one rotation precisely.
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Oct 1, 2012 20:41
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Russians.
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Oct 1, 2012 20:41
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Ghostridin' dat Hind.
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Oct 1, 2012 21:09
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Forums Terrorist posted:The camera framerate is synchronised to the rotor speed such that every time it takes a frame the rotors have completed one rotation precisely. You can get a similar effect if you blink your eyes at a regular and semi-quick rate while watching gently caress near any spinning thing. Helicopter rotors, wind mills, etc. It's a handy way to count the number of blades props or rotors on aircraft that are in motion if you're an airplane geek.
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Oct 1, 2012 21:11
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Cyrano4747 posted:You can get a similar effect if you blink your eyes at a regular and semi-quick rate while watching gently caress near any spinning thing. Helicopter rotors, wind mills, etc. It's a handy way to count the number of blades props or rotors on aircraft that are in motion if you're an airplane geek. Gonna need a video demonstration of you doing this in public, please. Thanks in advance.
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Oct 1, 2012 21:19
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Cyrano4747 posted:You can get a similar effect if you blink your eyes at a regular and semi-quick rate while watching gently caress near any spinning thing.  It's called aliasing, and it's a result of the Nyquist sampling theorem. Things that happen at a frequency faster than half the rate at which you are blinking appear instead to be happening at some frequency related to the sample (blink) rate and the actual frequency. A possibly-familiar example: an anti-aliasing filter removes frequency content higher than f_sample/2 so that it does not alias back into baseband. When you antialias something in photoshop you're eliminating information that has a higher spatial frequency than the sample rate (which in the case of an image is defined by the distance between adjacent pixels). So if you blink at exactly the same rate as the rotor is spinning, it will appear to be completely still. In fact, you can blink at many related rates (2x, 3x, et cetera), and because the rotor is rotationally symmetric, you can blink at even other rates since you can't really tell which blade you're actually seeing in a given position. Note that you can also make the rotor appear to go backwards by doing this; you see this effect a lot with wagon wheels in western films, for example.
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Oct 1, 2012 21:24
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FATWOLF posted:Gonna need a video demonstration of you doing this in public, please. Thanks in advance. https://www.youtube.com/watch?v=Uef17zOCDb8
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Oct 1, 2012 21:28
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Ahaha jesus christ.
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Oct 1, 2012 21:31
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Guess he picked the wrong day to quit smoking.
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Oct 1, 2012 21:34
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According to random Youtube Commentator:Random Youtube Comment posted:this is bullshit, nice try, though. This is the footage of the first flight of an experimentally modified Mi-24 Hind (at least you got that part right) and its blades are indeed stationary. Propulsion is provided by 2 jet ports, one on each side (near the main rotor). Air inlets are above the pilot's cabin, they're visible briefly in the video. The blades just haven't been removed from the helicopter yet. So, possibly, the answer is: Crazy Russians. durtan fucked around with this message at 19:30 on Oct 2, 2012 |
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Oct 2, 2012 19:27
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Yes, youtube comments are a gold mine for factual information.
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Oct 2, 2012 19:35
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durtan posted:According to random Youtube Commentator:
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Oct 2, 2012 19:40
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The rotor is used to land, by opposing the repulsion of the ground.
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Oct 2, 2012 19:43
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Dude you can clearly see the inlets for a moment. It's obviously a hovercopter
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Oct 2, 2012 19:45
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I suspect magnets are being employed, nobody knows how those work.
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Oct 2, 2012 19:46
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priznat posted:I suspect magnets are being employed, nobody knows how those work. Maybe everything else is rotating around the helicopter 
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Oct 2, 2012 20:16
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That explains this loving headache.
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Oct 2, 2012 21:30
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When using the top secret Caterpillar Drive, the Hind becomes almost undetectable to SOSUS arrays.
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Oct 3, 2012 02:24
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Theysh shall hear the shound of our shilenshe! *cue worse redition of the hymn to the soviet union ever*
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Oct 3, 2012 02:42
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Forums Terrorist posted:Theysh shall hear the shound of our shilenshe! It's not a rendition of it, it's something reminiscent of it composed by Basil Poledouris, so you shut your filthy mouth.  https://www.youtube.com/watch?v=onGWF8mz1Zw Phanatic fucked around with this message at 04:34 on Oct 3, 2012 |
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Oct 3, 2012 04:30
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A long while ago refuling photo's were posted. Included was our favotite A-10. I seem to have found a video (the end clip) to go along with it. https://www.youtube.com/watch?v=It51u8OgDnM In addition I saw this posted up there as well. The refuling of a B-2. It seems kind of ghostly how it comes in from the clouds. https://www.youtube.com/watch?v=A5UR9FReNuY
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Oct 3, 2012 04:44
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Not the same without the music https://www.youtube.com/watch?v=D5cEpoHLFOk
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Oct 3, 2012 05:05
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LP97S posted:I have a quick dumb question related to the cold war. I'm watching an older discovery channel wings on the Mig-29 and Su-27 and they just got to the first demonstration of the Mig-29 in England and I started to wonder something. How did the logistics and permissions for getting military equipment from the East out to places like Paris and England for the shows during the Cold War? Couple days ago but also worth mentioning that this didn't start happening until the '70s with only going to really big shows like Paris and didn't really take off on a large scale until the '80s and Glasnost. So relations between East and West were quite a bit less tense than if they'd flown a couple of Badgers to Fairford or something during the Cuban Missile Crisis. And yeah, even today everyone still plays the game regarding trying to keep your cards secret while seeing as much as you can of the other guy's. priznat posted:I suspect magnets are being employed, nobody knows how those work. Jesse does: https://www.youtube.com/watch?v=EwVDDxoKBk4 LP97S posted:Not the same without the music Robert Dornan, the congressman?!?!? Here's some pictures  R.J. Mitchell is rolling over in his grave (Kelly Johnson and Ben Rich probably are too). I've posted it before but it's an awesome picture, and it's relevant given the discussion about Soviet aircraft coming to Western airshows:  (click through for huge)
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Oct 3, 2012 07:56
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UAV from somewhere overflew Israel this morning, the IAF doesn't put up with that sort of thing: https://www.youtube.com/watch?v=vpmTiO8OakA
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Oct 6, 2012 17:22
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Looks like an F-16 peeling away at the end there.
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Oct 6, 2012 19:42
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This was my desktop for a while... I read the armies of snow & sand pdf posted a while back, what are some more good books/resources on the Soviet arms trade as it related to individual countries? I'd also be interested to learn more about the post-colonial proxy wars in Africa & any Soviet memoirs of Afghanistan/Chechnya. I just read SOG by John Plaster & it makes me want to read No easy day to see how things have changed but the special forces memoir genre is hit or miss for me. Does he go into much detail (or are there any telling omissions) about strategic objectives, logistics of air support, their philosophy of force, any of the "big picture" things beyond what he personally experienced? That P-51 picture would have at least made sense with an F-22. smh
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Oct 14, 2012 06:20
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As far as air support in dirty wars goes, you need to read Here There Are Tigers...it's the memoirs of a USAF pilot flying covert unacknowledged FAC missions over Laos in the late '60s. Well written and very interesting. As far as war in Africa go, it isn't post-colonial since it was a colonial war but Counterinsurgency in Africa: The Portuguese Way of War is well written and a good read. Another one that's worth reading is Dancing in the Glory of Monsters...I suppose it isn't really "post-colonial" since the war took place after the Cold War in the '90s and '00s, but it is a really good read and covers a conflict that a lot of people in the West know little to nothing about.
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Oct 14, 2012 10:40
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iyaayas01 posted:As far as air support in dirty wars goes, you need to read Here There Are Tigers...it's the memoirs of a USAF pilot flying covert unacknowledged FAC missions over Laos in the late '60s. Well written and very interesting. As far as war in Africa go, it isn't post-colonial since it was a colonial war but Counterinsurgency in Africa: The Portuguese Way of War is well written and a good read. Another one that's worth reading is Dancing in the Glory of Monsters...I suppose it isn't really "post-colonial" since the war took place after the Cold War in the '90s and '00s, but it is a really good read and covers a conflict that a lot of people in the West know little to nothing about. I wouldn't buy any of these books unless you have an interest in Rhodesia but "Fireforce: One Man's War in the RLI" and "Out of Action" by Chris Cocks, "Mukiwa: A White Boy in Africa" by Godwin and "The Bush War In Rhodesia: The Extraordinary Combat Memoir of a Rhodesian Reconnaissance Specialist" by Croukamp are memoirs about the conflict. "Rhodesians Never Die" by Godwin is an overview of the war/Rhodesian white society. Charles Lohman, Robert McPherson, “Rhodesia: Tactical Victory, Strategic Defeat” is a good overview of the war.
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Oct 14, 2012 15:48
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sausage paddy posted:That P-51 picture would have at least made sense with an F-22. smh That P-51 picture would have at least made sense if it had a P-51 in it.
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Oct 14, 2012 16:06
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Veins McGee posted:I wouldn't buy any of these books unless you have an interest in Rhodesia but "Fireforce: One Man's War in the RLI" and "Out of Action" by Chris Cocks, "Mukiwa: A White Boy in Africa" by Godwin and "The Bush War In Rhodesia: The Extraordinary Combat Memoir of a Rhodesian Reconnaissance Specialist" by Croukamp are memoirs about the conflict. "Rhodesians Never Die" by Godwin is an overview of the war/Rhodesian white society. So all of those are decent reads? I'm always a little leery of stuff about Rhodesia since there's the whole racial component and "mercenary legend" bullshit, so I can never be sure if it's going to be an actual legitimate history/memoirs or a bunch of made up bad-rear end bullshit with some thinly veiled HURR racism.
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Oct 14, 2012 19:51
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iyaayas01 posted:So all of those are decent reads? I'm always a little leery of stuff about Rhodesia since there's the whole racial component and "mercenary legend" bullshit, so I can never be sure if it's going to be an actual legitimate history/memoirs or a bunch of made up bad-rear end bullshit with some thinly veiled HURR racism. They're legit as far as I can tell. There is a lot of ~badass poo poo~ in Croukamps book but he was a Selous Scout. They're all racists to some extent but none of the books especially offended me. "Once Upon a White Man" is another memoir that wasn't too bad. The part about the war is only a few chapters though. Ian Smith has a memoir out too but I didn't read the whole thing. "Rhodesians Never Die" is an analysis of Rhodesian society and how it was changed over the course of the war.
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Oct 14, 2012 21:35
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A story of some Cold-war espionage turned up in the UK press this week: Operation Barmaid
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Oct 14, 2012 22:09
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Pablo Bluth posted:A story of some Cold-war espionage turned up in the UK press this week: Operation Barmaid
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Oct 14, 2012 22:16
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Veins McGee posted:They're all racists to some extent but none of the books especially offended me. Yeah, I should've clarified...I know there is going to be some racism in any history of that region/time period due to the nature of the society, especially in memoirs, I was just referring to stereotypical over the top Soldier of Fortune type poo poo. grover posted:As much as I love a good cold-war story, this one seems to strain credibility. After reading Blind Man's Bluff, I've come to the conclusion that submarines were capable of pretty much anything during the Cold War.
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Oct 14, 2012 22:39
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iyaayas01 posted:After reading Blind Man's Bluff, I've come to the conclusion that submarines were capable of pretty much anything during the Cold War.
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Oct 14, 2012 23:21
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grover posted:A submarine sneaking into soviet waters? Yes, that's plausible. But a submarine sneaking into soviet waters and getting mere feet from a towed array of unknown sensitivity that it has no way of sensing or tracking, yet somehow guiding a pinpoint cutter into it and stealing it? Just doesn't past the *cough*bullshit*cough* test like other whacked-out cold war stories (undersea cable tapping, glomar explorer, etc.) do. You think it's implausible yet cite undersea cable tapping in Soviet waters which is just as balls out insane?
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Oct 15, 2012 00:56
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Psion posted:You think it's implausible yet cite undersea cable tapping in Soviet waters which is just as balls out insane? He also cited building a giant gently caress-off claw game rig to reach miles beneath the ocean's surface to pick up an entire Soviet missile submarine off the bottom as being more plausible.
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Oct 15, 2012 03:10
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McNally posted:He also cited building a giant gently caress-off claw game rig to reach miles beneath the ocean's surface to pick up an entire Soviet missile submarine off the bottom as being more plausible. *without being noticed by the Soviet spy trawler circling them the entire time.
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Oct 15, 2012 03:40
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Some of the conspiracy theories surrounding Glomar Explorer are just adorable in a way. My favorite is that the US had already removed everything they wanted using remotely operated undersea vehicles and that the Glomar Explorer was a massive misinformation campaign against the Soviets, with news of the mission failure intended to leak and also a massive payoff/kickback to Howard Hughes from the Nixon administration. indeed
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Oct 15, 2012 04:10
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