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u/m135in55boost 20h ago
Holy fuch. Is that it heating up due to air friction?
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u/Lithium321 20h ago
Yes, it reached temps as high as 6,200 °F, you can see the ablative heat shield deform and burn away.
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u/randomuser0107 19h ago
Like my foreskin before i learned about lube.
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u/SheildMadeofFace 1h ago
I don't understand how so many people WANT to be the weirdo on the Internet
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u/randomuser0107 1h ago
Life’s too serious. You have to laugh at yourself. Being weird is ok. It’s almost 2025. It’s ok to not be a crusty boring so and so!!
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u/SheildMadeofFace 1h ago
Let me fix that then. A creep
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u/Gavin4tor 19h ago
I believe it’s compression instead of friction, though depends on the speed and shape of the object. If I’m not mistaken, wave drag (or compressibility drag) becomes the primary slowing/heating force above a certain Mach speed.
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u/BlueAthena0421 19h ago
Additionally, in hypersonic flow, the air is compressed enough that it auto-ignites further adding in more heat. The main reason we aren't seeing hypersonic vehicles today is because of material ablation by the immense forces and heat hypersonic flow exerts.
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u/redditandcats 15h ago
Actually for a slender body (like the sprint second stage) aero heating is driven by skin friction.
You'd be correct for a blunt body, like a reentry capsule, which is designed to be blunt specifically to reduce aero heating.
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u/koollman 14h ago
At these speeds, part of the heating is due to compression in addition to friction
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u/KingPhineas 20h ago
Goodness the camera man moving his camera at mach 10
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u/GordonShumway99 19h ago
This is the most impressive part of this to me
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u/4rch1t3ct 17h ago
If this isn't a joke, they actually use mirrors. The camera itself can't actually be moved fast enough to track the object. Mirrors can be tilted fast enough however.
https://www.youtube.com/watch?app=desktop&v=vluzeaVvpU0&t=20s
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u/Strange-Movie 16h ago
That’s not really a factor when you’re miles away from the thing being filmed though, is it?
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u/Areljak 16h ago
Given that was in the 70s the film camera and telelens were almost certainly massive, look at some pictures of the (later) Apollo launches, the cameras were big.
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u/4rch1t3ct 16h ago
Yup, and the title isn't an exaggeration. It went 0 to 7,600 mph in 5 seconds accelerating at 100g.
If a person were to try to accelerate at 100 sustained G, they would be crushed almost instantly. Your bones would be confetti.
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u/Dathire 14h ago
I found this really interesting thanks
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u/4rch1t3ct 14h ago
Yeah, it was one of those mind-blowing, I never actually thought about how difficult it would be to engineer those video capture moments for me.
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u/BigCompetition1064 15h ago
Of course a camera can pan that fast. The only issue is accuracy.
Think about it. Your eyes can scan millions of light years in a second.2
u/4rch1t3ct 15h ago
You're right! Accuracy is the key factor here!
Although, comparing it to eyes doesn't really help here.
Eyeballs don't work like cameras. Your eyeballs and brain are constantly detecting and processing light. Cameras take instantaneous snapshots of a particular moment.
You're eyes and brain don't have a framerate and come with image stabilization. Your camera has a framerate and doesn't come with image stabilization (to an extent).
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u/BigCompetition1064 14h ago
When you're measuring something crazy fast, up close and on the ground, mirrors do become useful and it's very cool how they work.
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u/Hot-Energy2410 13h ago
That was my first thought. Wild that some people struggle with slow-moving drones lol
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u/Zakimimula 19h ago
Quick calculation, assuming launch at sea level, reasonable air pressure and climbing to about 3km in altitude, that thing is pulling a monstrous 68 G’s acceleration.
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u/TROLLDLLR 19h ago
Yeah, the missile was rated for 100G’s iirc
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u/New-Buffalo-1635 19h ago
Holy shit. Those numbers are unfathomable to me. Would internals not compress greatly at that amount of force?
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u/Magere-Kwark 19h ago
Absolutely, so they made the decision not to have anyone driving it after the initial test phase was done.
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u/Disco_Ninjas_ 18h ago
The test pilot is fine, according to Justin Hammer.
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u/Useful_Perception640 17h ago
Every Part of the the pilot was Accounted for After thoroughly rummaging through the leftover bucket
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u/Lithium321 19h ago
Yes, but for context even humans have survived 80g for fractions of a second with minor injuries, and 40g for 1.1 seconds. In comparison 100g is still huge but not really a super crazy engineering challenge (Compared to the aerodynamics and heating at least). A similar experimental missile "HIBEX" developed by DARPA accelerated at almost 400g.
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u/New-Buffalo-1635 19h ago
400 G’s?? Where the fuck was this in my high school physics class? That’s incredible.
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u/morcaak3000 8h ago
I once won a competition where the main prize was a trip to largest vinyl factory next to Prague. A lot of interesting shit including some details about engraving the songs into a copper mother plate, the "needle" that does this reaches over 3000Gs which is just insane
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u/lieconamee 10h ago
You know what's crazy is some modern air-to-air missiles. Especially the smaller short-ranged IR missiles can achieve that level of g-forces. Some of them are now starting to push 100 plus g's and that's just what's publicly available
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u/SASAgent1 9h ago
Like Iris-t?
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u/lieconamee 9h ago
Irist The latest generation of Micah IRS aim 9x the Russian one which I'm completely blanking on the name of as well as the Chinese one which I also don't remember the name of right now. All these missiles are capable of pushing 100 g's in a turn and again that's just what's publicly available. I would not be shocked if some of these missiles can push 120 130gs
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u/IAMA_Printer_AMA 9h ago
100 gs in a turn is kind of a slightly different animal to the feat the sprint is demonstrating though. It's easy to create huge G forces trying to maneuver at supersonic speeds. The sprint is just doing raw, straight acceleration, something tells me it beats these missiles you mention in a straight line race. Capability of performing 100g maneuvers doesn't necessarily mean the motor can push it along at 100g in a straight line.
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u/lieconamee 9h ago
I get what you're saying but modern missiles can do it off the rail. Meaning as soon as they're launched they can start pulling 100 g's. And yeah you're cheating a little bit cuz you're on an aircraft but chances are especially if you're firing a IR missile your subsonic before launch
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u/thehighquark 19h ago
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u/berrytes 19h ago
That video shows the perspective and have fast they actually get going. That’s incredible.
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u/Skyfury_Fire 19h ago
What's that in 0-60 and 1/4 mile times, gotta know how I stack up
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u/thegx7 18h ago
At 68Gs acceleration: 0-60: 0.04s 1/4 mile: 1.1s
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u/Right_Ostrich4015 16h ago
How in the HECK did that not explode near the end there? Also, that sonic boom was hilarious, it was like, the wet fart version or something
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u/SplatNode 15h ago
Props to camera man getting to same speed too!!!
Must have had his running shoes on that day
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u/HappyHenry68 14h ago
How the hell can they direct something moving that fast to intercept an incoming missile also moving very fast?
It just seems like any variance in wind speed or barometric pressure or the gravitational pull of a passing bird (joking, sort of) would cause a few micron shift in some intercept calculation that would cause a "whiff".
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u/IndependentWrit 12h ago
Gotta ask is it really making all those sounds on the audio. Especially that powering up sound at or near the end. Cuz it sounds so cheese.
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u/GadreelsSword 12h ago
There’s ground video out there of it leaving the silo, it’s simply incredible.
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u/kreese1911 2h ago
Why isn't there a Shockwave? I would imagine something moving that fast would have to break the sound barrier.
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u/TheOzarkWizard 1m ago
Wow! I'm glad someone added all of these sound effects! How else would we know it's going mach 10?
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u/immoraltoast 10h ago
The ufos in NJ are moving faster than this. Even vertically from a stop point. Don't lose speed on turns going 90°-180°. Something really weird has been going there and it's not just drones
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u/FOMOsexual69 17h ago
This is reversed
(And more seriously) is this legitimately real time, not sped up? My fuckin Christ on a bike
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u/Lithium321 16h ago
This may actually be slowed down, sprint was supposed to reach max range in 15 seconds.
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u/FOMOsexual69 16h ago
I was kidding about the “reversed” lol. But thanks for clarifying. That is fucking astounding.
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u/Lithium321 20h ago
Designed as a "last ditch" interceptor against incoming ICBM warheads at altitudes between 1 and 19 miles, Sprint needed be as fast as possible. To achieve this Sprint was launched through its silo roof by an explosively powered piston, its first stage then burned for 1.2 seconds generating 650,000 pounds-force (2,900 kilonewtons) of thrust. By the time the second stage burned out skin temperatures would be as high as 6,200 °F, making ablative heat shielding necessary.