Sprint - Test Flight 4
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- เผยแพร่เมื่อ 31 พ.ค. 2024
- In the interest of being thorough, I ran one more F10 test flight without a roll program to zero in on the roll-control reaction wheel.
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I already told you, this is the only reliable roll maneuver: th-cam.com/video/dQw4w9WgXcQ/w-d-xo.html
GODDAMN IT
I'm not angry, I'm just disappointed.
nah mate i've been in the internet for long enough to recognize that URL
The thing is, I know the URL but I just went on there without paying attention and felll for it
Well played sir.
Can I just say, I find it super smart to present the launch before the monologue. This is the interesting bit, followed by why it was interesting - not everyone would do it in that order.
Officer, this rocket didn't respect quarantine.
Valentin Fascist
Renato Digitalo ???
Actually that rocket was social distancing itself 143m from the planet.
Valentin why... it only created more social distance
Damn that TVC control is getting SMOOV
6:20 “And that is exactly what the data shows”
Seriously Joe, you’re doing some professional standard rocketry. Motor manufacturers excusing in-flight failures because most amateurs will never notice them is unacceptable. I sure hope you find a substantially more reliable source for your propulsive power. As for your roll sensitivity to pitch rate, if all you want to do is reach altitude, then it’s no problem. But if your goal is demonstrating the core competence of dynamic rocket guidance, then this needs to be solved. And many motors can handle radial loads. Maybe use a ball bearing motor (there are some excellent Swiss made small brush servo motors available). Maybe use a cheap bushed motor but mount the reaction wheel in ball races. Maybe drive reaction wheel motor with extra current, proportional to roll and yaw rate to overcome increased frictional torque. Maybe choose an alternative roll control scheme. Any way you choose, keep up the great work, it’s excellent!
Uhmmmm, that orange paint sure looks like something totally unrelated with a future rocket
Well, in my opinion, orange is not bad on large fat super heavy launch vessels. However, still Atlas bronze bettee.
Its just Joe manufacturing some homemade hydrazine after he tests the H engine
Have you cut open casings of motors that seemed to have burned properly?
BUTTER
love the tracking shots
SṔⓇIÑⓣ
სპრინტ
Hi Joe. Your videos are awesome. Can you tell me what software or programming language do you use for the gui we're seeing with the plots of the sensors?
@@TitiloTeam matlab
@@TitiloTeam The GUI is in Java, but most of the data is calculated in matlab like @D.T.6 said
@@boweneveritt3400 Isn't it processing (which is technically Java with some fancy stuff added)? Not sure anymore.
ˋI rotated the vehicle 90 degreesˋ
*shows 180 degrees rotation*
When you turn your life around by doing a 360
Joe,
Thank you so much for sharing your videos with us. In the 70's I LOVED making and launching rockets. It was such a thrill. Watching your launches brings back that thrill.
Be safe Joe.
Famous NASA quote "... let's light this candle"
Famous Elon Musk quote: "We're going to make it happen. As God is my bloody witness, I'm hell-bent on making it work".
Famous BPS space quote: " ... ooop!"
Excellent editing, by-the-way, you should give a few pointers to NASA. Timing the advancing data to the half speed footage is really informative. ... and cool!
That 17 second burn is gonna be awesome! Looking very forward to the results. Do you have an estimated altitude you think you'll achieve with it? If you're getting 163m from a 6 second burn, the new motor could net you 350-450m pretty easily. Good luck!
Thanks! Not to spoil too much, but we did about 210m on the 17 second G8, just need to edit the footage! It's surprisingly hard to get a good apogee estimate on those long burners, small changes in burn geometry lead to vastly different apogees. I thought it'd be closer to 300m ¯\_(ツ)_/¯
I love how you explain highly technical stuff in a way that a relative landlubber like myself can understand.
Blue skies and calm winds to you sir.
Thank you
I love the way your system accellerates at a speed so much closer to scale than other hobby class rockets!!!
Carbonated Sprint
Ah yes a new video from my favourite ballisitc missile builder :P
Best tracking cam shot yet
I liked that the reaction wheel is kind of like a fidget spinner when you pitch the spinner a bit you can feel that its getting effected and slowing down :).
Absolutely love your content. A lot of effort and yet even better results. Keep it up
I love the style of placing the launch at the start instead of talking for minutes like other youtubers. . .maybe it is your degree coming in handy, but it definitely keeps me engaged and then I am interested to hear all about the launch. Nice work!
Another brilliant video Joe! Keep up the great work. Stay safe and carry on.
Love your shots, it looks so good.
Really interesting and incredibly well filmed (light and process) thanks!
Love it you have really fine tuned your aircraft really well.
Pls only daylight shots in the future . This looks so much better :)
Super interesting explanation on the momentum reaction during pitch over, thanks !
Absolutely beautiful trajectory
Great video. Though it may look like gyroscopic precession, the yaw rate which manifests once the vehicle starts to roll during the pitch-over maneuver might come from classical inertial coupling. N_ic=p*q*(Iyy-Ixx), where N_ic is yawing moment from inertial coupling, p is roll rate, q is pitch rate, Iyy and Ixx are respectively the yaw and roll moments of inertia about the CG. Because there's a large difference between Iyy and Ixx for rockets vehicles, fairly large moments can occur during maneuvers which combine roll and pitch rates. Likewise a combination of roll and yaw will result in a pitching moment. This would be fairly easy to model in Simulink and you could use your angular rate flight test data as inputs to your simulation. Assuming symmetry and integrating your total yawing moment (N=N_ic+(dr/dt)*Izz) you could estimate the expected yaw rate (r) during the maneuver. You'd also need a model of any commanded yawing moment due to thrust vectoring but that's pretty straight forward. The moments due to the aerodynamics might be a little more difficult but because your rocket is essentially neutrally stable Cmalpha and Cnbeta might be nearly zero. If not you could still estimate these derivatives and use inertial estimates for alpha and beta to estimate the aero terms. There's a great 1948 NACA paper by Phillips (NACA TN 627) which I believe discovered this in theory with a 5-DOF formulation before anyone experienced it in practice. Also Richard Day's "Coupling Dynamics in Aircraft: A Historical Perspective" is a good easy read for inertial coupling familiarization.
just an idea for you, add a shaft extension through the wheel to another bearing which should eliminate the sheer on the motor bearings.
You could also put the extension between the motor and wheel, with the bearing/bushing just below the wheel.
Joe, you are starting to make it look easy now. Great job!
Love the videos. Quick suggestion; when pointing at things in a close up, using a pointer or pencil or something would be a great way to convey what you’re gesturing at much more precisely. Good luck with the motors.
Ive been watching your videos for as long as you've been making them and i can tell you're going somewhere
I agree with your gyro motor shaft drag conclusion. Another thought, since you are not spinning this gyro in a vacuum, you are generating torque via aerodynamic drag on the flywheel. You should change from a spoked design to a solid disk shape with less aerodynamic drag from spinning. Keep 'em coming!
For the roll control problem, there are probably several solution: use ball bearings for the wheel and "decouple" the motor from it. Or use a small brushless DC motor which has ballbearings already and enough rotating mass that you could omit the wheel at all. Or drop the reaction wheel complete and go for two gimbaled rocket motor which could provide roll control - but could become mechanically challenging :). I like the pitch over manouvers a lot. They look pretty cool ..
Are you going to print a new motor mount for the reaction wheel that incorporates a ball bearing support the motor shaft or do you have a different strategy?
From 7 to 17 seconds motor, cant wait to see that... amazing stuff!!
This is deeefinetely your quickest vehicle turnaround yet
@Joebarnard
Hey Joe.. this was the most stable flight i saw from all of your videos ..
I literally just stood up and clapped on this video when it lifted-off and performed so well...
Yes there was reaction wheel failure when it changed its course by a certain degree... But its a nice shot and this will lead you to more leaps
Just beautiful
I feel like you are missing a lego astronaut looking out the “window” that can be seen with the onboard camera🤔
Wow! This project is Awesome!!!!
nice flight ! congrats !!
great work on that torque based thing you mentioned.
Kudos Joe! Stay healthy.
Eyy, that's exactly what I said was probably the cause! I think a simple bearing support on the other end of the shaft for the motor would probably help. It'll probably still brake due to sideways force causing more friction, but at least you aren't getting the brutal bending force causing the motor to bind.
Hey Joey B, If if were to purchase a flight computer from you, what would be the protocol for guidance system updates? For example, if you updated the software so it guided better, would my computer be able to get that update, or would I have to purchase the computer again?
Would you ever be able to downlink live data from the on-board sensors during flight?
If we want to measure the barometric pressure for measuring altitude, where to place the pressure sensor on the rocket to measure the exact change in pressure. And is there anything that we have to do calculation wise and coding wise to calculate the barometric pressure from sensor output values.
Any answers for this ?
Could monitoring the RPM of the reaction wheel help solve the issue? If the flight controller detects lower RPM on the wheel, it delivers more power to compensate and bring the RPM back into spec. This would also allow a known amount of control at any given moment. Maybe switch to a brushless motor for better monitoring and control? A PID loop would probably be needed as well, but that is right in your wheelhouse.
The draw back would be wearing out the bearings/bushings in the motors faster as they may not be designed for increased axial load. However, a low KV drone motor might get the job done.
As always, great work. I really enjoy these videos.
I don't understand a single thing here. But, somehow I enjoy and watch every video.
YES love this your work is awesome! Go for the moon
Loving this series so far. Looking forward to seeing how the longer flights go. Slightly off topic, what software are you using to graph the data? Looks a little like Grafana.
It looks really cool man
Is your motor starting out spinning and going faster or slower to control the roll? Or is it starting at standstill and spinning up to control the roll? If (b), would it work to start the motor spinning slightly in the reverse direction, and then stop it to introduce the roll? Then worst case it might still be turning a little, but never very much
Hi Joe. Looking to try and use a Raspberry Pi onboard a drone to get it to fulfil certain actions when given a specific task. Any suggestions?! Any idea what I'd need to, like past tests of your Sprint rocket, have it travel x meters on a particular axis etc? I am guessing there's a specific piece of hardware or chip I can get for the Pi for that? Thanks mate!
Is it possible that the burn problems or the debonding are somehow connected to the pitch maneuver? From a timing perspective it looks kind of close.
Not my scene but is you have two wheels running in the opposite direction and then brake one or the two of them to control roll? Would have to control both actively after the roll to stabilize it again.
I can see a Joe Barnard approved rocket motor in the works !
Anyone know what software he is using for the telemetry graphing?
Beautiful takeoff
Do you have a feedback from the gyro? knowing rpm would be helpful in those situations.
wow thought shut would not deploy very nice great job good looking model.
excellent video .. !! What is the software that you use to make the graphs ...?
Quite hyped for that next flight ngl
Solid as a rock
I have a quick question about the launch pad. When those flames come out the side just prior to liftoff, are they the plume from the motor being diverted, or are they super tiny, short burning motors? I believe I recall you using the motors for the Falcon Heavy replica, but I was curious if you used them here as well.
Also, is that rocket poster behind you a Copenhagen Suborbitals poster?
Those late chutes scared me so bad
I love your videos and one day I also want to build model rockets like you
Good job, keep it up! How is the motor attached to the reaction wheel? When it changed rotation direction that could have put a lot of torque on the binding, separating it
Unsolicited, annoying military nit-pick: You've got the American flag oriented incorrectly. The stars should always be leading. Think of it as if the flag were on a pole and was trailing in the wind. The stars would be on the upper side of the rocket with the stripes trailing down.
Awesome series, awesome rocket, great job!
EDIT: Dude.... I cannot wait to see the G8 flight! 17 seconds! That'll really allow your TVC to stretch it's legs.
Good catch, I didn't even notice that
Remind me of watchin movies with my dad. The artists fucking up all the uniforms etc. Supposeddly they are starting to hire old vets to make everything proper lol.
@@ericlotze7724 Nice. There's plenty of us out there.
That's a good catch although to be fair to Joe it's not easy to find "backwards" US flag vinyls. It would be weirder to flip it upside down to get the stars first.
I never knew that until I got involved in a military sponsored event, and whoever ordered the hats had oriented the flags on the side of the hat backward. It became quite an "issue" and I feel sorry for whoever designed the hats.
Well it’s not quite going so fast it begins to glow but I wouldn’t want it near any of my ICBMs, nice work guys
Respect bro
10:05 Still remains as my favorite Joey moment
What software do you use for these data analysis used in the video. Can you please help?🙏
Great flight and explanation. Now it’s time to use a larger motor....
I am curious to know what he uses to reverse the polarity on that small dc motor for roll control. I have a H-Bridge board but it would add much un-necessary weight to an already fat rocket.
Where did you buy the G8 from? I can't seem to find it.
If you support the end of the motor shaft with a bearing it will alleviate the side loads. Another layer on the motor mount so it is supported at both ends should do it
Bro! Flatten that curve!!! You going to get us all killed...
Can you make the wheel almost be like a ball bearing inside the rocket so the motor shaft is stable and won’t move under pressure? Possibly smaller size inside of a casing.
Hi BPS i would like to ask you something : could you do a mini serie about the *FULL* construction of sprint pls ? Also, could you say what is the software your'e using to build your rockets ? I subbed to your channel not long ago and i would like to see how do you do all of those rockets...
How is the status of the liquid fueled rocket which you announced early this year?
Perhaps trust vectoring is causing the engine failures. What kind of interia does the high velocity gases have? How does that change if you wobble the motor around? Perhaps it would be a good idea to Mark the x and y on the motor so you can know it's indexing relative to the rocket x and y.
nice one Joe!
those glasses makes you look even more smarther🤟
Even more smarterer!
Good job
I look forward to more controlled thrust landing efforts too!!
Could the pitch over have an effect on how the rocket motor operates?
Great day light. Great day flight.
AHA I love the window!
I like how he always shows it like it's an ICBM launch.
Super random question, I'm on a TARC team and we were curious as to how you painted the letters on the side of Sprint? Were they decals, stencils, paper, or something else?
Ooops is not the kind of thing you want to hear on a rocket launch. :D
Better that than during brain surgery.
Regarding the loss of roll control on the pitch over: If you want to relieve side load on the motor you might have to run the shaft *through* the wheel and anchor it on the outboard side as well.
This may be a dumb question but what does the reaction wheel do?
you are so crazy !! Dont Stop :)
Could the de-bond issues also be a result of the pitch-over? Seems like the timing roughly lines up.
Hey that's exactly what I thought was wrong with the reaction wheel/motor! You're faaaaaar better at explaining it, but I'm still feeling pretty smart right now haha.
Can you anticipate the flywheel torque when pitching over and have the thrust vectoring work with it?
When thrust vector(90):
FlywheelSpeed = more