Rippin' The Fins Off A Rocket

[journeyquest1]

Should have made the fins more rigid and secure. Ive seen this happen before. Nice video.

[aaupton]

Hi, Originally it was not designed to exceed mach and that is the reason tip-to-tip was not done on the fins. See comments from a few years ago. The motor did better then expected so this was the result.. Have fun !

[Geoffr524]

Right after I saw what looked like sky writing, by the out-of-control rocket, it said "Enter your Text here". Funny stuff.

[mugsytop]

that was nice fin flutter.

[shollys9]

Yep, Core Samples SUCK!

[viperf50]

To Bad it didnt spell, ILL GET YOU MY PRETTY!

lol

[53rockets]

cool! so did u do this with a video-camera submitting LIVE video feed to the ground or is this camera different??

[aaupton]

@53rockets Hi,

This camera is one of our live feeds.

Art

[n7275]

Max Q

[rebsunrise]

Excellent

[miniatureme95]

enter your text here lol

ive never seen a model rocket do that just not back fire and nose dive a foot deep

[Thefirstspectra]

thats what happens when theres no gyro

[xentris77]

check out my rocket video (if you want) every thing went perfect and then disaster struck... it blew up :( haha

[amybas]

Rocket on Coca :)

[colinshark]

RRRRIP IT!!!!!

[Icepacalapse]

Very cool....I'm sure nasa guys have seen and archieved the fins departing.

[WHFilmsAndProduction]

The aerodynamic term is 'flutter'. Nice example of transonic effect.

[aaupton]

Yes correct Flutter,

But flutter does not work on youtube search as well as "rippin' fins" ;)

[Helicopterpilot16]

Flutter works on youtube!

[derekroolz]

i am guessing quite valuable material was lost

[aaupton]

Everthing was recovered fine.

Only the aeroskin airframe was damaged

[peeeete]

poor rocket:(

very nice ship tho

[crapman94]

it made a face 1:25

[wynnebros]

my c engine rocket was clocked at 896mph so howcome this one only went 700

[aaupton]

That is very interesting.

Do you have the data for that?

IF so you will be a world record holder for C engine speed.

[r0ck3tsm0k3]

No he doesnt because it didnt happen. C motors would be hard pressed to break 400 mph.

[bzzh8c]

Sure would. Max performance C rockets that I've seen (min dia, ~11" long,5-1 ogive cone, ellipse 1" fins, tumble recovery) top out around 1800 ft and max out just around half that speed.

[aaupton]

Humm... C motors won't do 900 feeet per second let along 900mph.

Check your data please Sir

[bzzh8c]

You're right aaupton, even a min diameter D motor rocket in a vacuum has a max velocity of around 900 ft/s. So a C motor in air would surely be a lot lower. I was estimating max V based on altitude, but the math doesn't work out !

[bktech333]

wow what kind of fuel

[aaupton]

Cesaroni Aerospace APCP in an N1100

[bestamerica]

where is the dry lake area

[ljsavmech]

wow even your failures look cool. I love the fin flexing. great aerospace info for kids....

[dazzaspud4life]

O.O BIG

[crockerfilm]

haha.

"and the coffee makers up there"

lol

[heheomg1hehe1]

the fins may have broke but how did the rocket crash? the paracute should have still deployed?

[aaupton]

Hi, The rocket's damage was dne up in the air. The chute deployed at the time of thefin shred due to how electronics work.

If fell harmessly but the damage was done up in the air, look close at a replay

[iDoDew]

Could the wing flutter been helped if the fins were canted so as to have a corkscrew flight? It would make lousy video, but would it hold together better?

[normellow]

This is a perfect vid that shows fin flutter ! Fins of that design suck for that reason. Fins have to be long and as narrow as possible in order not to flutter. At super sonic speeds only the strong survive !!

[tomcornwall83]

Very nice video :D

[mwakelin]

Crackin video - great to see what actually happened to the fins.  Shame the rocket bit the dust tho.......

[Runoldski]

looooooooooool

[aharrin1]

To us aerospace engineers that is called wing flutter.

[ephraim0000]

What's it called to non-aerospace engineers? Do you use a different lexicon to everyone else?

[munkeeboi83]

what kind of materials were the fins made out of? and how were the fins attached? I've been building rockets for sometime, but nothing on a large scale. are you using carbon fiber or fiberglass fins? I had some aluminum fins my dad made me when I was a kid, but that didn't fly with the local NAR safety guy.

[wayne205stevens]

oops! bit too fast for the fins! lol

[hellkid94]

damn that sucks wht place did u get?

[Monkeysaysoohoohah]

Spectacular!

It's much more fun when they do something unpredictable like that! Much more interesting than a successful flight.

...and it makes it all the more fun that you had the camera and all the sensors to see exactly what happened during flight.

Bravo!

[dreammaker182]

Over-powered but sweet!

[yulooz]

where was it in jackson, i live here

[aaupton]

It was at LDRS 25 in Wayside Texas. The Jackson club all drove there.

[steve250782]

nice rocket forged alloy would be the go no break, what would it take to reach outer atmosphear?

[Ibeechu]

Jackson, Michigan represent! Excellent flight... well, except for the part where the fins ripped off and the rocket became a missile :P

[nolifeclan]

lol it left the camera

[rounddot5827]

it would have been sweet if it wrote something in the smoke

[XDEREKXJULIENX]

ummm.. what the hell happend at the end??? lmao

[aaupton]

The fins came off due to Mach effects and the rocket then became unstable.

Being Unstable, it safely flew about the recovery harness until the fuel ran out, then came safely to the ground.

[siegfrieddej]

nice!

[Dranod]

Hmm different fin design - perhaps tubular may not flutter so much?

[PotatoViolenceCrew]

what was in the rocket???

[Maxsapd]

your brain

[GoRideaMTN]

mmm

[RocketScience92]

Was it hard getting the camera?

[aaupton]

The Camera was still on the rocket, but the lens was broke off as it hit the ground.

The video was transmitted to the ground and recorded in real time.

[tomcornwall83]

What res video can you transmit to the ground real time?

[drsheikhjunior]

800mph!!!that supersonic!!!impressive.....ve­ry cool until the end part..

[tjthev]

Enjoyed watching the launch but not the disasterous end.

[kenmtb]

Need an emergency destruct

[Zoomer30]

That was sick. You can see the booster still firing away from the cam, course the cam is not ON the rocet anymore,

[aaupton]

Actually the Cam was still on the rocket.

The Cam was on the payload section watching the booster skywrite still attached together with the recovery harness.

[Zoomer30]

To borrow a line from Galaxy Quest to descirbe that fin flutter..."

"Noooo that anit right nooo"

[mannfizzle]

that was some crazy fin flutter; wonder what the fins were made out of

[aaupton]

.187" G10 fiberglass

[fastmax94]

nice flite until you lost the fins

[Mazda6B6]

hmm. super sonic and the fins break?

[rippon10]

the fins were not designed properly for the speeds its all about areodynamics. i had a rocet that made it past 1.75 mach it took over 15 attempts trial and error then i got a adeodynamics book and made it to over 2.1 mach. its all about design.

[aaupton]

You are correct.

The issue however was that the rocket was not expected to go past mach ;)

Art

[MartySchrader]

Carbon. Stiff, stiff, stiff. Hard to beat for rigidity, man.

[mlotek9]

Flutter...those are some crazy stresses on those fins, i think fiberglass is decent but not the best choice for material. Was the fiberglass layered only one direction or something?

[aaupton]

Hi Mlotek9. The fins were standard G10 sheet. To help prevent this you use tip to tip fiberglass lay up over the G10 fins and body/motor tube.

[theXORone]

aerobatic model rocket ;)

[minga86]

got fiberglass?

[aaupton]

the fins were G10 Fiberglass ;)

They should have been tip-to-tip layered to prevent this.

[aaupton]

Why but of course, but then you miss the purpose of thhe Booster Bruiser. It was made with none of those special techniques and flown progressivly on higher low average thurst motors until the point of no return was found. It was found on this flight

[VooDooRocketry]

Another wonderful flight by Air Boostervision! Great stuff!

[Adalore]

Good Fins are needed no matter what!

[all4vid]

gotta love rockets!