Steering A Rocket At Mach 1.3

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Jim Jarvis: @Jiminaus50
Huge thanks to the folks who helped with flight data animation!
Dan Kozak
Andrew Barth
Matt Wassell
Gabriel Yamato
How I made this video: • How I Make A BPS.space...
You can sign up for an Onshape account by clicking this link: onshape.pro/BPSSpace
Fineas Flight: • Fineas - Test Flight 1
Mark Rober Egg Drop: • Egg Drop From Space
Roll Reversal Paper: arc.aiaa.org/doi/abs/10.2514/...
Thanks to Julian Rice for the liftoff photo on Flight 1: / vulpesjr
Camera Spinner pt 1: • Can You Get Stable Vid...
Camera Spinner pt 2: • How Hot Does a Rocket ...
Like the music? Unironically check out my Soundcloud: / joe-barnard
Help support BPS.space: / bps_space
Second channel, mostly for KSP: / musicmakr
For more info:
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www.bps.space

[@BPSspace]

Thanks to Incogni for sponsoring this video! To get an exclusive 60% off an annual Incogni plan, use this link: incogni.com/bpsincogni

[@simplegunsmith]

What happened to your RCS thruster system I think I saw you show off in an Everyday Astronaut video? Could that theoretically work in a situation like this?

[@jeffGordon852]

Looking for an intern?

[@thesprinklerguy2598]

I sent a email to you a email a few months back about rollerons.. nice to hear you talk about them

[@cosmefulanito5933]

Please do not use scam ads. Thumb down.

[@TheMightyHams]

As someone who just finished their mech eng final project that (to my own detriment) involved a truck load of ANSYS simulations, I don't envy the CFD that you ended up having to do 😂. I'll look forward to the next video with the details.

[@dmacpher]

“Supersonic aerodynamic control” is in no way the same thing as “terminal guidance” two dudes in the van out front of my house.

[@ChucksSEADnDEAD]

That's not his department. He just wants to go up.

[@dmacpher]

@@ChucksSEADnDEAD wink wink nudge nudge, say no more

[@JustGoAndFly]

That's just me I'm homeless not FBI. The other guy is FBI tho and hes in my van questioning me about your KZbin comment.

[@MoritzvonSchweinitz]

I know playing with terminal guidance is a taboo of sorts. But is it actually illegal? And how come there is so little on that topic available online outside of the US?

[@LoisoPondohva]

​@@MoritzvonSchweinitzit's not illegal per se, but doing it without license is problematic and posting about it can be illegal. But that's US. It is illegal in many other countries.

[@4077Disc]

BPS: "The good news is we aren't doing any of that math today..." Me: " :( " BPS: "...That's the topic of the next video." ME: " :) "

[@everettgihring8099]

This. 😂

[@AndyPhu]

So true

[@Mr.Maus.Thunder]

Same

[@MiG-25IsGOAT]

@@everettgihring8099 That

[@paulbizard3493]

Don't be sad. You've got just enough time to study Quantum Field Theory before the next video.

[@rickrack78]

My dad helped develop a few rockets for General Dynamics, they used something called “dithering” which made the fins vibrate(?) and when they wanted to steer in a particular direction they just made the fins spend more time on one side by interrupting the occultations, favoring the direction they wanted to go

[@JustGoAndFly]

Yah pretty sure Salvatore pais scaled this technique up to make the tic tac vehicles.. wingless UFO can only be explained via vacuum creation via high frequency vibration. Likely powered by compact fusion reactor.

[@theavaliengineer]

So, duty cycle control? I've seen it work with rocket motors (see: kinetic kill vehicle used for the DART) but never with fins. Interesting!

[@paulholmes672]

Which is not a very new concept as we used similar methods for early R/C aircraft control before we came into the wonderful world of Proportional servo control, in the late 60's.😁

[@rickrack78]

@@paulholmes672, well it was the early 1960’s when he was doing it, so yeah

[@AerialWaviator]

Nice ... use of random control noise, and then removing some randomness to influence control. Makes me wonder if the "dithering" was a technique to disrupt shockwaves traveling across the control surface.

[@theAquillo]

13:07 cracked me up, i just wasn’t expecting that mouth movement

[@manshenriksson]

"Alright, we're BABABABA into the video..."

[@aurorajunior6328]

Whenever you say “ should I do a video on it“ no matter what it is I immediately want to see it

[@Peteboi64932]

Same dude, same

[@LafayetteSystems]

You could have convinced me the animation looking down along the airframe was real footage. Holy moly the little tabs work so well!

[@reuellouwrens9853]

Collab????

[@Techno_Idioto]

@@reuellouwrens9853 I mean, Lafayette Systems already uses this type of control on their DIAMOND-X rocket.

[@anihopkins6788]

“And as always, they were mounted with about thirty pounds of hot glue” there is something profoundly wrong with this man and that is why i am subscribed to his channel

[@carolinejoybarnhart3717]

When you started in on canards, I started muttering "elevons". When you started talking about talking about rotation the whole fin, I nearly yelled "elevons" at the TV as well as grumbling in 737 Max overcontrol. Then when you showed your solution, I was like, DUH, elevons. Yes, I know the shuttle used a separate rudder, but honestly you should be getting the point since you had four "wings" instead of two. This is how supersonic aircraft control their flight. And if you see my name and picture, and recognize them, LONG LIVE THE PID. Glad I found your channel, we did know each other. And to really induce swearing you need to botch a Kalman filter.

[@david_31]

JOEY B BACK WITH ANOTHER SLAMMER OF A VIDEO

[@BPSspace]

🆙🆙🆙

[@mortlet5180]

Was that a reference to the informal nickname of the AIM-120 AMRAAM, or just a coincidence?

[@pd28cat]

@@mortlet5180AGM-84 SLAM-ER

[@abbeytheoctopus2772]

We leaving the ground with this one 🗣️🔥🔥🔥

[@BPSspace]

YOU KNOW IT 🆙

[@vigilantcosmicpenguin8721]

we goin UP 📈

[@sirisawadcharoensuk6569]

We’re going ⬆️⬆️⬆️⬆️⬆️⬆️📈📈📈📈📈📈📈📈

[@NDJ2ND]

The neat thing about unplugging the servo on the first flight is it gave you a baseline for comparison and illustration of future flights.

[@zac778]

The simulations at the end are outstanding and it demonstrates how your channel not only inspires others to take on engineering projects, but perhaps even more importantly the channel builds a community of very talented aerospace engineers who come together and make meaningful contributions. Great job! Kudos to Gabriel, Matt, Andrew and Dan.

[@NicholasRehm]

Joey B out here controlling an aircraft over a WIDEEEEE envelope on his f̶i̶r̶s̶t̶ second try, and I hope ya'll know just how hard that is! Aircraft control derivatives scale with dynamic pressure (combo of airspeed and air density)... This basically means an aircraft behaves very differently at different speeds/altitudes with the same control deflection. The successful flight is a testament to Joe's math all collapsing down and "un-coupling" the rocket from its environment, from aero modeling to control system design to sensing. Next video is gonna be good! TL;DR: 😍🚀😍

[@BPSspace]

Awww thank you so much dude! That means a lot :)

[@AerialWaviator]

100% ♥ ... x-plane level engineering!

[@puckplayer219]

"I am not proud of everything I do." is my life motto.

[@glennllewellyn7369]

I hear you. We have NO regrets.

[@k1ng401]

@@glennllewellyn7369I do

[@justinhu9650]

Sometimes… life SUCKS and sometimes, the thing you make are… disturbing

[@dfgaJK]

15:15 🤣🤣🤣🤣🤣. I'm very glad for your sake that you got that on camera!

[@stanmacdonald1073]

It's fun seeing you go through the same problems I encountered about 15 yrs ago. I built a rocket with canard driven by high-powered rc servos. I put together a controller with an $1100 Analog Devices IMU and a custom microcontroller with SD card parameter control and data recording. I initially wanted to control roll. had 9 flights without success. At first I thought I had a control system bug, then I thought I might have a hardware problem. Finally I mechanically fixed the canard at a constant angle. I had roll reversal in every flight. I finally installed a camera to verify the data collection. Unfortunately the rocket came in ballistic and the 8 foot rocket was compressed into 8" long wad. I researched this problem and ran across a group in the NW that was having the same problem and had identified AIAA research that identified the problem many years ago.

[@nerdtronaut]

There’s nothing better than trigonometry

[@BPSspace]

REAL

[@Haren94]

What about laminar flow?

[@sir_vix]

😮😭 *Quadratic Equations left the chat*

[@user-mn2su2qg3c]

there is one and it is called calculus

[@Thunder-cj4ck]

​@@user-mn2su2qg3c Hell yeahh calculus the GOAT

[@arcmchair_roboticist]

As a computer scientist, I would be interested if you could make a wind tunnel to gather enough data on the effect of the vortices and build a controller to compensate for them. No idea how hard it is to build a wind tunnel though, and I'm sure I'm underestimating the difficulty of that control problem. Good luck! Great video as always

[@ChucksSEADnDEAD]

The problem is that funneling air into a supersonic flow isn't exactly for the home gamer.

[@3RaccoonsInATank]

building a wind tunnel is actuly kind easy. building a supersonic wind tunnel however, less easy.

[@KCM25NJL]

Actually, building a supersonic wind tunnel in itself is not that difficult. Gathering the relevant amount of currency to do so, while building it in a place that is about 500 miles from your nearest neighbour........ different story.

[@technikchaot]

As someone that studies Engineering Informatics (mixture of computer science and electrical engineering) I often have to work with computer science that had never heard any physics or mechanical engineering lectures and they are most times better at algorithmic and similar thinking stuff but don't let have mechanical or electronics ideas. Wind tunnel up to a couple of hundred km/h no problem use a fan big and fast enough and you are good to go. You still need to think about how to reduce the effect of the turbulance of the fan, maybe build a pull configuration the expected wind speed for the same input power is slightly slower but should still work. But now the trans and supersonic Problems. These speeds are not possible with a fan alone. And the pull configuration does nothing. If your fan is to powerfull you suck a vacuum but still don't get mach 1 and in the push configuration you still would only near to mach 1 and than produce a high preassure zone. So you need a nozzle the same type as the one on the bottom of a rocket engine. It solves the Problem of converting high pressure gas to high speed gas. BUT the gas goes from very high pressure (tens or hundreds bar (atmospheres)) to 1 bar or below every expanding gas cools down. And this kind of depressurization would lead at least to freezing water and CO2, but depending on the pressure drop even to liquid nitrogen or oxygen (unlikly in home build variants). So you don't need to start with a high pressure gas. You need to start with a high pressure high temperature gas. Problem is most materials get weaker under high temperature but the high pressure is really high so the whole thing is near its failure before you even have moving gases. Second Problem you don't want to see effects of pressure waves reflecting of the tunnel walls because that would cause similiar uncontrolable feedback loops as the canards to the fins earlier in the video. So the wind tunnel should be at least factor 5 to 10 bigger to the test object (model rocket) now we test a small model with a fin can that is only 5 cm in with (to be honest to tiny to have good estimates on how a big one would react). The wind tunnel has at least to have a diameter of 25 cm. 0.25m*0.25m*pi/4=pi/64 m² this times the desired speed of 300 m/s (yes I know speed of sound is faster under normal pressure and temperature but I will not estimate which temperature we could manage to reach in our tunnel) at 0.5 bar is pi/64 m²*300 m/s*0.5=7.36 m³/s. So you would need every second of testing 7.4 kubic meters of air delivered to your wind tunnel, forget it. This is for each second 4 full (and not the smallest ones) air bottles that divers use. Because there is no for not that rich individuals available solution that would produce this preassure and quantity of compressed gas on the fly (exeption rocket motors but they burn to hot to hold a normal test object in exhaust).

[@manfredgawlas9936]

I'm working on aerodynamics of rockets myself. From what I've heard from a people who works directly with that kind of aerodynamic tunnels, just the cost of preforming a single set of tests on subsonic tunnel capable of fitting rocket this size is at minimum few thousand dollars. Not to mention building a supersonic tunnel. You can get good results just by simulations alone tho, I basicly work with that, Solidworks is a pretty good tool for obtaining such data and is extreamly easy to use. However I would questions it's results for trans sonic flows.

[@ledocteur7701]

The fins extra thickness didn't seem to be an issue, but if you do want to reduce there thickness in the future one option is to mount the servos inside the fuselage and have a thin shaft go up into the fin to control the tab. This could also allow almost all the cables to be inside the fuselage as well, further reducing drag.

[@drhxa]

For sure please do a video on control over transonic flight regimes! And I'd love to see one (maybe combine them) about CFD you mentioned, what specifically was the effort required to succeed, the process, and the modeling. We love the theory

[@UnlikelyToRemember]

transonic is really hard (it's why jetliners which have the power to exceed about 0.85 mach just don't). Best bet here is just to get through to the other side as fast as possible.

[@EAFSQ9]

joey out here innovating cost-effective aerospace telemetry and guidance solutions with servo-in-wing-tabs

[@CheeseWithMold]

21:15 Aside from the first couples seconds or so of this, you could've absolutely fooled me into thinking this was on-board flight footage. Well done to the community for helping here. Also would love a video on transsonic flight.

[@petergudden]

There is a reason for all moving fins other than extreme manouvrability. At the end of WW2 aircraft became uncontrollable due to the elevator being behind the shockwave (where it looses effectiveness) just when they were very much needed because of the onset of Mach tuck (which is a nose-down moment on the lifting surface in transonic flow). The problem of controllablility was solved on the Bell X-1 with an all moving horizontal stabilizer. On supersonic missiles this is the all moving fin. Your trim tab seems to function more as a spoiler (so to create drag) than as an aerodynamic surface to direct the airflow. It definitely gets credits for a shoestring approach. Hope you don't mind me making a suggestion: spoilers don'' t necessarily have to be in the fin section, they might as well be in the aera where you would expect the canard fins or anywhere else on the vehicle. The obvious advantage of moving the spoilers away from the fins is the available space for the servo's. Now your fins can be thin again to reduce the drag. I hope this suggestion will help you past Mach 2 and eventually into space in a controlled manner.

[@Waffle4569]

> "Switched over to fancier onboard cameras, GoPros" > 2 minutes later > "None of the GoPros worked" You got the full GoPro experience

[@SlimeyDev]

We leavin the earths atmosphere with this one 🗣️ 🔥🔥🔥

[@brocktechnology]

I've been watching your last 3-5 years of videos over the last month or two, this is pretty much the solution I've been yelling at the screen through all your roll control adventures. looking forward to the rest of the story.

[@user-ez9vp7sh7b]

Im 28 years old, former police Sgt., college grad, and father of 3....I look up this man. What an inspiration you are. Weather permitting, I am about 1 week from getting my PPL as I now pursue aviation full time! Hope to meet you some day!

[@TheWinning247]

I think you bumped into the problem they had breaking the sound barrier with the oldschool split control surfaces. You've gone smart and made a teeny tiny control surface, but the split control surface becomes basically useless in the transonic region, which is why they moved to all moving control surfaces. You've probably already come to this conclusion, but if you put a teeny all moving contol surface at the tip of your fin, you'll retain control authority at speed. Having the surfaces that far out will make them more potent in roll as they have a longer lever, but hey, make smaller movements. Keep it up, it's an instant click whenever I see one of your videos!

[@tedchirvasiu]

Imagine the thickness of FBI's folder on this guy

[@infinitelyexplosive4131]

You’re both a good rocket scientist and also a good storyteller

[@dhbengineer]

I always love the sheer attention to every detail Joe puts into everything. Everything from the rocket's functionality, the camera shots, and the video edits are all phenomenal quality. Keep up the good work.

[@billsheppard9368]

Thru the whole length of the vid, one thing kept popping into mind was this: For control on the X-Y axis, a single, tapered spike on the nose, able to be pointed off-axis for 'steering'. This would eliminate downstream vortices from canards. Your tiny tabs on the back of the fins would take care of roll.

[@KegRocket]

This edit hits different! Loving it 💯

[@Gingerbread3232]

KEG ROCKET NO WAY, bro can you please tell me if your gonna keep uploading in KZbin I need to know!, I’m a big fan bro!

[@benjaminnevins5211]

So excited for your project!

[@gallagherthewolf5845]

I love watching the process over the years

[@MiG-25IsGOAT]

In the past, only a couple of objects could reach supersonic, the goal being INCREIDIBLY difficult, challenging, and made by tens of engineers, but now, even a random guy with a youtube channel can do so. How humanity advances so quickly is just too beautiful

[@benjaminshropshire2900]

Before I finish watching the video; there is a neat trick that the first AIM-9 Sidewinder missile used to avoid needing to compensate for things like density altitude: it used force servos on the fins rather than position servos. The result is that, with a few assumptions about the center of force on the fin staying more or less the same distance behind the pivot, a given turning force on the fin created the same side force on the missile body more or less regardless of speed or altitude. The entire guidance and control system on the first marks of the AIM-9 are a fascinating cases study in how a spec project with almost no budget can force better designs.

[@basbomb2018]

Your humanity and willingness to share mistakes is what keeps me coming back. Keep it up. Also, what about air brake flaps angled to push the air away from the body (as opposed to the traditional direction of air brakes that “bite” the air)? They would be very small, not need to be particularly strong, and should be very light. They would be very fine tunable too I think. Just an idea.

[@mrhalfbacon]

I was just watching the previous video wondering when the next one would be- and my prayers got answered!

[@mmcnama4]

I would watch a video titled "10 sexy tops to keep it going steady (how to prevent your missle from rolling)." Joking aside, the production value of these videos just keeps climbing- love it!

[@wesgoodhoofd348]

Control systems are so satisfying when they do what you want. Great to see how it worked in this case and can't wait to see the next video of details!

[@aw_dev]

Joseph bizzlington back with actual missiles now 😂

[@darkmetal20]

I am 13 year old boy. You have truly inspired me to pursue my passion in rocketry.

[@Raven3one]

Be prepared for lots of failure, and you best damn well make sure you get up and try again. Do. Not. Give. Up.

[@patpilot1675]

Me too I was 12 when I saw this guy and now I’m 16 sending my first high power rocket

[@Singulut]

@darkmetal20 Me too!!! I already tried to build a sugar - kno3 rocket but it failed This summer I will try again!

[@pd28cat]

Internet safety: 📉📉📉

[@anukrathnayake]

I love the style of the video! Each video is getting better and better. I have high hopes for that spaceshot getting beautiful footage.

[@KlingbergWingMkII]

Don't feel too bad, Lockheed made a very similar connector mistake on the THAAD program. Missile went about 100 yard before burying itself into the desert. The connector was to load the guidance program, but when the wires pulled out they shorted the guidance system. So, no guidance. D'oh!

[@macebobkasson1629]

BRO ITS YHE GUY BEPIS JOHN OUT HERE ROCKET? a good start to the day :)

[@AirCommandRockets]

Outstanding video production Joe! Very interesting discussion on the control issues and the importance of doing good post flight analysis of what worked and what didn't.

[@spartanash1]

The missile knows where it is at all times. It knows this because it knows where it isn't by subtracting where it is from where it isn't.

[@Gingerbread3232]

YES HE UPLOADED

[@JackDalfino]

Bro I love been checking like once a day for like 3 months

[@Gingerbread3232]

@@JackDalfino I just turn on notifications

[@dr4d1s]

We are all excited but why are you yelling?

[@Gingerbread3232]

@@dr4d1swhy are you so mad, and I’m not yelling dumbass 💀

[@izzythepug]

he looks exactly like elon musk

[@ayaanrazzak9116]

Ikr😂

[@user-vo1rm7om8o]

lmao elon needs to see this🤣

[@YoussefCherqaoui]

You do all this to put something in orbit is something. You do it for the latter ,and filming for entertainment is something++ . Bravo

[@phoenixrising4073]

Every time I watch one of your videos I am genuinely happy for you and what you've accomplished. Keep it going man, you're doing great.

[@bndncn]

Way cool. So stoked every time one of these videos hits my feed, thanks for doing all this!

[@AceSimulations]

Supersonic flow is fascinating. I have been working on my own rocket to test control methods in a compressed flow flight envelope and can say the work you are doing is really amazing. I can't wait for the next video!

[@TAdamLaird]

Transonic video needs to happen for sure. Also great job on figuring this one out, I know it was a big step and took a lot of hard work. Every day you are getting closer to space and I love to see it!

[@jwaero]

This is awesome! And your videos were already amazing, but the increase in animations, editing, etc took it through the roof!!

[@s.m.aggies7220]

Great news Joe, about the test flights. So amazing to view the simulated flight using telemetry, great work of friends continual on with learning and working with the Mission. :)

[@norm1124]

I try to design my first working PCB - so many things look similar: little errors and fatal problems. Amazing channel and SO happy every time I see you in good shape ❤️❤️❤️

[@adamreynolds3863]

great job on making that rocket! this is so awesome!! honestly that CAD model of the data from the flight is pretty cool, ive not seen POV like that before

[@Spacecode14]

You are the perfect mix of youtuber and engineer, these videos are great and inspire people. Thank you... can't wait for the math video :)

[@HuskerTexan]

Excellent job. Very impressive how you have stuck with this for so many years.

[@xevious4142]

"Thrust vectoring was just easier with fins" Insane lol. Very impressive stuff.

[@brendan8915]

those visual representations of the camera data are nothing short of absolutely incredible! Man, that is exceptional work. Bravo all.

[@Stellar_Lake_sys]

this is super cool, really looking forward to the next vid. would also enjoy seeing a video on transsonic flight issues, I'm vaguely familiar with how they affect aircraft, but it'd be interesting to hear about how they come into play with rockets

[@AderNyland]

Transonic! Yes please!! Great videos, I love learning along with you. Thanks for putting in all the crazy effort.

[@semmus9664]

That 13 min voice edit had me laughing so hard. Keep up the good work!

[@KofiAsare0]

Incredible work, looking forward to the next video!

[@Me-ld8bt]

This is REALLY cool. Good job! I am looking forward for the next video.

[@MADmosche]

Very much looking forward to your upcoming videos about cameras and the transonic speed issues.

[@chadlanc]

I was driving the other day across the desert and had a thought that I hadn't seen anything new from you in awhile. Good to see a new video!

[@tgirard123]

Just did the incogni deal. That was very cool. Thanks

[@joelhavinga8366]

transsonic video? yes please! loved this one, you're doing a great job!

[@ScubaDrew]

One of your best videos of all time. Your persistence is inspiring. BPS!!

[@robaust3049]

Always great to see a video and your trials, wins and successes… I live by data and have often debated the value of on board footage and you always show the benefits.

[@Kevinxilai]

Gabriel Yamato is the best when we talk about simulations with Ansys. Tu é foda!

[@AVEAE]

Very good, there is an italian guy who developed something similar 12 years ago. You can check his video called "Adriano Arcadipane: Roll gyro stabilized rocket with automatic control system." Aerospace Engineering

[@tomkoopmann5442]

I think this is the best video you've ever made, keep upping that production values! This is amazing! Also, yes please, we all want to see the video about transonic flight regimes.

[@AlexanderGuryev]

Joe, it is amazing project! And super-fun story! Good luck to you and cosmic launch heights to your rockets!!

[@HarleyKing001]

Masterful storytelling, Joe. Great ride. Thank you.

[@aidanstarke8303]

Thank you joeB once again for my absolute favourite content. Have a good day!

[@hectorgerardomunoz4736]

Great job Gabriel, thanks for your contribution using Ansys STK simulation SW.

[@ComradNr2207]

OMG! Another BPS Video. Best Day in my life!

[@karoinnovation1033]

Absolutely fantastic, wow. Impressive work and passion. Go for it.

[@haph2087]

Yay, the latest BPS episode. Finally, a good roll control method for your rockets! I wonder how this compares to reaction wheels? Would having both perhaps help improve control through the transonic region? I would love a video on why that speed is hard to control flight at. I'm also curious about the fluid modeling, and how accurate different modeling approaches are. What data can you get before launching? What tools do you use? How much uncertainty do you have in the results? Looking forward to the next episode!

[@dihler55]

Being in the FPV quad scene has told me one thing about GoPros: the newer they are the less rugged they got and the more easily I've seen them fail.

[@HardCoil]

Awesome job, this whole process i so satisfying to watch. Getting those vizualisations is a great bonus outcome of that little camera error :)

[@erickvond6825]

Dude, I super love nerding out with you. I can pretty confidently say that every video you've already put out and all the future ones that you haven't yet made. Just do what you love. I'm pretty sure we'll all like it.

[@mattmartinez3442]

Amazing video, can't wait to see what happens next! I would love to see real footage side by side with the simulated footage for the next flight.

[@lawrencerubanka7087]

Awesome, awesome, and awesome! YES, we want to see the maths and analytics video. Thank you for your great work.

[@BixbyConsequence]

I've been following the Sugar Shot to Space project for what seems like 20 years. I dare say you're going to beat them to space. Subscribed. Good Luck!

[@paulholmes672]

I perceive through my experience of supersonic/near supersonic flight control (16 years around F-111 Avionics, :-)), your early on hunting may have been an effect of the boundary layer flow (BLF) across the fins going through changes due to the sonic transitioning shock wave generation. Once supersonic flow was stable, the roll surface could 'play' in a 'quiet' space. We had multiple static pressure sensors and localized pitots around our jet airframe that would measure Boundary layer pressure to, then help, fine tune surfaces such as flight controls but also engine inlet shaping to keep inlet air subsonic. I would suggest looking into the design changes done, over the early years, to both aileron placement along the trailing edges of wings to eliminate/minimize aileron blanking and things like spoiler tabs, etc. Also, early supersonic aircraft went from horizontal stabs w/elevator tabs, but had to switch to all moving tail planes for elevator control, as the elevators could also blank, but some of that effect had to do with the REALLY turbulent stuff coming of those wings (and their shock waves in front of the always rear mounted elevators/elevons. Definitely a lot more of a dilemma than just pointing the surface/tab where you want to 'steer'. Excellent work sir!!! 😁

[@arzen9835]

Undergrad aerospace engi here. Glad to see how feedback control of dynamic systems and aerodynamics courses may be applied within a small scale in a workshop! I Hope I'd be able to construct any advanced sounding rocked before graduation inspired with your channel!

[@sofielee4122]

I was sitting here waiting for you to mention the rollerons on the sidewinder cause its like, one of my absolute favorite engineering solutions ever. So elegantly simple and yet works incredibly well Edit: im not an engineer, just a mechanic, but i think a combination of servo tabs and entirely moving fins is the way to go. This is how the trim system works on just about all modern jet aircraft. Little tab moves in opposite direction of where you want the surface to go, and generates a moment on the major surface. Allows for precise correction without having to put an enormous load on whatever you're gonna hinge the tab with. Much easier to design a fin hinge that can withstand that sort of load than a tab hinge that can. Just my $0.02 though, supersonic aerodynamics is super weird, and aviation and rocketry are only marginally similar

[@rototiller345]

YES WE WOULD LOVE ANY MORE VIDEOS FROM YOU NO MATTER WHAT THEY ARE

[@Tiberius126]

Always enjoyable, always quality. Thanks!

[@jamiehobson6336]

This is crazy how that little servo has given you so much control of that rocket!

[@user-lb5fz3ne4j]

What an amazing video. Congrats. Please upload moru frequently

[@RTS907]

Thanks! An awesome video, I just loved model rockets when I was a kid. Turned that into a EE/computer programmer.

[@iamnickdavis]

Awesome video again, can't wait till the next.

[@OpeideFredrik]

Great video! Looking forwards to the next one