Ok really stunman the fins were made out of fiberglass. This is a Quantum Leap model rocket from Public Missiles. The fins were fluttering as they would call it since it is going well past mach. Its crazy to believe that they would even bend like that. Btw supersonic speeds are Mach 1.2 and up. Mach 1-1.19 is transonic
the warping fins are a bi-product of the type of camera recording sensor and vibration most likely from speed...take a picture of a rotating fan with your phone camera and you will see the same effect but in a still picture.......
the warping fins are a bi-product of the type of camera recording sensor and vibration most likely from speed...take a picture of a rotating fan with your phone camera and you will see the same effect but in a still picture....
For those that want to know... That is a PML Quantum Leap model. The fins are G10 fiberglass with a carbon fiber overlay. What you are seeing in the video is caused by the conversion process. Those fins didn't do that. They can't.
5/5, this is the most amazing sound barrier video I've ever seen, you can clearly see it's impact on the fins and the immense g-force implied after firing
Yeah, Fighter Pilots say the same thing. There is no Sonic Boom heard in the cockpit. You have to be on the outward - "slow" - side of the wave to hear it.
kind of like holding a pencil between to fingers and shanking it so that it looks like rubber. I agree but I still belive that is the point of sonic. I think that as the cone and camrea punch thru the barrier that is what caused the vibration u discribe or it could of been that the tail had not pass the barrier and for a split sec it was still subsonic.
Sonic Boom would only be apparent to a ground observer. As the sound waves collect behind the object approaching the speed of sound they build up and when it surpasses the sound barrier is when you hear the boom, but you wont hear it if your in the object.
I'm guessing that the altitude/apogee was approx. 20,000' and avg speed during burn was 1000 fps, with a max speed of 1350 fps on final stage with max thrust prior to burnout. The fins remained motionless, suggesting it was 7075/T6 Al...not many synthetic materials could withstand that force. I would not be surprised if the tube was thin wall T6. The velocity, integrity, & stability make this a VERY impressive launch.
The max velocity can be seen/heard at 00:11 & likely it was a little over "c". At 00:10 c/1130 fps was reached which is seen when the rocket goes transonic riding in its own sound wave & causing distortions, & a wild, rapid spin. 4 substantial fins are noted. I want this!
I'd guess the fins warp from air turbulence when the rocket goes transonic. I doubt the warping is due to the camera, since stuff around the fins doesn't seem to warp, and the fins seem to have gradient lighting in accordance with their shape.
I don't think the fins are actually warping. I've flown a lot of r/c airplanes with video cameras on board, and on occasion vibration will make waves in the video. Besides, if the fins are aluminum, they would stay warped. Unless they are made by Rubbermaid!
1. Flutter, the aluminium fins are being elastically twisted (possible even with this amount of distortion) due to aero elastic effects
2. the density change due to the shock wave is causing a lensing effect which make the fins look bent. the "flapping" is caused by the movement of the shock wave forward and aft. as the rocket accelerates only way to tell would be to put strain gauges on the blades (and a DAQ on the rocket) or perhaps pattern matching from the ground.
Ok really stunman the fins were made out of fiberglass. This is a Quantum Leap model rocket from Public Missiles. The fins were fluttering as they would call it since it is going well past mach. Its crazy to believe that they would even bend like that. Btw supersonic speeds are Mach 1.2 and up. Mach 1-1.19 is transonic
Reptile789 6 months ago
okay that was BLOODY COOL
zyoungson 1 year ago
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the warping fins are a bi-product of the type of camera recording sensor and vibration most likely from speed...take a picture of a rotating fan with your phone camera and you will see the same effect but in a still picture.......
botagAD 1 year ago
the warping fins are a bi-product of the type of camera recording sensor and vibration most likely from speed...take a picture of a rotating fan with your phone camera and you will see the same effect but in a still picture....
botagAD 1 year ago
For those that want to know... That is a PML Quantum Leap model. The fins are G10 fiberglass with a carbon fiber overlay. What you are seeing in the video is caused by the conversion process. Those fins didn't do that. They can't.
jmar1371 1 year ago
5/5, this is the most amazing sound barrier video I've ever seen, you can clearly see it's impact on the fins and the immense g-force implied after firing
drewnickel 1 year ago
I love the fins ! 0:09
ZenonDorinPower 1 year ago
Yeah, Fighter Pilots say the same thing. There is no Sonic Boom heard in the cockpit. You have to be on the outward - "slow" - side of the wave to hear it.
shollys9 2 years ago
What you see in the vid is an illusion created by the digital conversion process.
Those fins are G10 fiberglass with a composite lay-up to the airframe. They are not capable of doing what is seen in the video. It would shred first.
K550+K185+QL2= ~13K AGL.
jmar1371 2 years ago
kind of like holding a pencil between to fingers and shanking it so that it looks like rubber. I agree but I still belive that is the point of sonic. I think that as the cone and camrea punch thru the barrier that is what caused the vibration u discribe or it could of been that the tail had not pass the barrier and for a split sec it was still subsonic.
ljsavmech 2 years ago
Yeah, flutter is not recomended
Helicopterpilot16 2 years ago
What altitude did that reach? Any idea?
StanleyKu 2 years ago
Im not sure how high it got but look at the vid I thing I saw the blackness of space. but naw could not be.
ljsavmech 2 years ago
Really, really, really, really, really, really, really, really, really, really, really fuckin high.
VMFA115Starloric 2 years ago
I saw this a while ago. One question..if its supersonic shouldnt there be a sonic boom as it passes the sound barrier?
Roversrocket 3 years ago
Sonic Boom would only be apparent to a ground observer. As the sound waves collect behind the object approaching the speed of sound they build up and when it surpasses the sound barrier is when you hear the boom, but you wont hear it if your in the object.
JetJockey87 3 years ago 4
Ok..thank you! That makes sense!
Roversrocket 3 years ago
@JetJockey87
...just a correction in front and not "behind" the object. ;)
molinobeer 1 year ago
What material are the fins made out of?
DTHRocket 3 years ago
I want to know how big the rocket was, what size motor was used, and how high it went. Looks like there were two other rocket as well. Correct?
DTHRocket 3 years ago
Did it airstart another motor?
DNanook 3 years ago
WOW! I'd give it a hundred stars if I could!
DTHRocket 3 years ago
The post below uses "c" but I meant "C" = SS = Speed of Sound, 1130 fps. .8Ma<Transonic<1.2Ma
PassionStone 3 years ago
I'm guessing that the altitude/apogee was approx. 20,000' and avg speed during burn was 1000 fps, with a max speed of 1350 fps on final stage with max thrust prior to burnout. The fins remained motionless, suggesting it was 7075/T6 Al...not many synthetic materials could withstand that force. I would not be surprised if the tube was thin wall T6. The velocity, integrity, & stability make this a VERY impressive launch.
PassionStone 3 years ago 3
The max velocity can be seen/heard at 00:11 & likely it was a little over "c". At 00:10 c/1130 fps was reached which is seen when the rocket goes transonic riding in its own sound wave & causing distortions, & a wild, rapid spin. 4 substantial fins are noted. I want this!
PassionStone 3 years ago
It could have been harmonic resonance causing the fins to vibrate like that couldn't it?
JetJockey87 3 years ago
That was fast!!
thadthewire 4 years ago 2
Simply wonderful!!!!!!!!! At what altitude it is arrived?
IGMD80 4 years ago
Hm...That was fast!
Does anyone knows what was the SPEED and ALTITUTE? I wondering...
Thanks!;o)
spshecot 4 years ago
nealy got into space!
monkynutzuk 4 years ago
wow..that is impressive...5/5 stars
drsheikhjunior 4 years ago
what is the thickness of the aluminium u are using on those stabilising fins?
coreylahey1985 4 years ago
I'd guess the fins warp from air turbulence when the rocket goes transonic. I doubt the warping is due to the camera, since stuff around the fins doesn't seem to warp, and the fins seem to have gradient lighting in accordance with their shape.
Gicior 4 years ago
I don't think the fins are actually warping. I've flown a lot of r/c airplanes with video cameras on board, and on occasion vibration will make waves in the video. Besides, if the fins are aluminum, they would stay warped. Unless they are made by Rubbermaid!
flyparks 4 years ago
That sounds right to me...I don't know exactly what the fins were made of...could've been some type of plastic.
stuman1159 4 years ago
@stuman1159 There is no material that could warp so. It's the camera vibrating,maybe caused by passing the sound barrier.
ZenonDorinPower 1 year ago
@stuman1159 Not only do you not know that, you don't know that supersonic speeds are quite a bit over mach 1. More like 1.05 and up.
superskullmaster 8 months ago
@flyparks 2 posibilities
1. Flutter, the aluminium fins are being elastically twisted (possible even with this amount of distortion) due to aero elastic effects
2. the density change due to the shock wave is causing a lensing effect which make the fins look bent. the "flapping" is caused by the movement of the shock wave forward and aft. as the rocket accelerates only way to tell would be to put strain gauges on the blades (and a DAQ on the rocket) or perhaps pattern matching from the ground.
mathmyster 5 months ago
what are the fins made of?
Blutarsky90 4 years ago
Aluminum
stuman1159 4 years ago
pls tell me what did you use as a poropellant
tomika162 4 years ago
dude this is the best video ever. I watch it at least once a day on average.
DMarc85 4 years ago
holy crap! Did you see those fins?!?
DMarc85 4 years ago
HOLY SHIT! Nice, What modle engine was it? O? M? what?
Razgris1 4 years ago
wow how do you make one of those engines, gunpowder or some thing else?
APDUMN 5 years ago
kno3 and sugar works good.....look it up
dddjjjmmm 4 years ago
You buy them.
r0ck3tsm0k3 4 years ago
That is truly brilliant!
Amazing man.
How much work to get a rocket made like that ?
mrblah125 5 years ago
Wonder why the fins dont warp again as it comes back below transonic speed.
r0ck3tsm0k3 5 years ago
the parachute probably scrubs off a lot of airspeed.
stuman1159 5 years ago
Parachutes slow things down, that is the idea...
r0ck3tsm0k3 4 years ago
How high was that thing
smltlu 5 years ago
Hella High....
stuman1159 5 years ago
2 stages...20,000+ ft. AGL
stuman1159 5 years ago
Whoa...how high up is that? And how many stages? Just two?
spencer232323 5 years ago