Reaction Control System(RCS) Development

[@cubecraftgalaxy5973]

Video title in 2025: Crew capsule development Video title in 2035: Mars crew vehicle landing test

[@tomthetoaster8004]

CubeCraftGalaxy Honestly though, I think that’s an accurate time frame for NASA

[@KesslerSpaceIndustries]

Are you an SFS KZbinr?

[@sebastianwaitzer9613]

C’mon that’s way to late

[@cubecraftgalaxy5973]

@@KesslerSpaceIndustries hey ive seen you before. And yes

[@theholderscock]

Hello fellow sfs player

[@AJ_Jones198XAD]

Every time you upload a video, I watch it, then play KSP for the next 8 hours...

[@kilovian353]

Lmao same

[@lalithchandramusipatla1480]

Even I do😊

[@vinsan98]

Same 😂😂

[@2003vito]

same

[@kazsmaz]

Try KOS bro. You'll not regret it. It's a mod for KSO

[@BPSspace]

SMASH that like button if you also spent an irresponsible amount of money on solenoid valves at 2am last monday

[@andrewgamer3cami392]

Done! Not selenoids but close... LIKE!

[@krijndees]

@@tinatarsia6457 whut can u explain better plz

[@peermoritz6547]

I do this every Monday....... Off course.

[@hollowworld7137]

Do you have a list of scheduled launches and rockets

[@krijndees]

@@tinatarsia6457 I think i get it a bit now XD

[@sepposyXIV]

Phoenix and InSight Mars landers used pulsed thrusters for landing, so pwm should work just fine.

[@DerKrawallkeks]

What about using propane? It is at about 8bar at room temperature and it will expand 270 times during the transition to gas form. This could allow you to reduce the size of the pressurized tank to a very small tank of 100ml or so. The biggest issue in this case is the cooling of the propane when transitioning to gas form. Usually if you let out gasious propane from the top of a tank of liquid propane, the liquid itself cools down, which reduces pressure and the ability to turn into a gas. This could be overcome by keeping the propane a liquid right up to the valve, and basically spraying out liquid propane. Then the absorbed heat energy will not come from the stored rest of liquid, but from the air surrounding the spray of liquid propane. Another option to overcome the cooling issue, that could increase performance greatly, is the heating of the liquid propane. In this case, you'd choose the simple tank that feeds gasious propane to the thrusters. Now that a big part of the cooling takes place at the stored rest of liquid propane, a single small propane burner can be used at the tank itself to keep the pressure high. If you think about 100ml * 270, that's 27 liters (athmospheric). That's the equivalent of a 2,7L (air) tank at 10 bars. I'm sure a 100ml tank is much lighter than a 2,7ml tank (both would hold 10 bars for comparable performance).

[@cloudvea]

OwO a scientist

[@Hope4Today9]

Me like!

[@Thee_Sinner]

Take a drink every time he adjusts his sleeve.

[@BPSspace]

RIP

[@mihailazar2487]

Words CAN NOT describe JUST HOW SATISFYING that sound is OMG I could listen to that ALL DAY Best type of ASMR

[@ercc923]

This is incredibly interesting, well produced video and I appreciate your engagement into making us learn and understand the difficulties and solutions of advanced model rockets!

[@StefsEngineering]

For the air storage, it may be interesting to look into cylinders for airguns, those are usally quite small and compliment the shape of the rocket quite well. you may even have enough room around the cylinder for the valves and other required equipment. (smallest paintball air tank is around 350cc, a pistol air cylinder can be found in 68cc (3000psi)

[@joshuabarosin779]

Could invest in making custom COPV’s, Air Command Water Rockets used fiberglass to create a custom pressure vessel

[@potatopobobot4231]

Cool story bro. Maybe try watching more than 2 minutes of the video before commenting.

[@LawrenceHuot]

Joe your freaking me out! RCS?!?! I just got into model rocketry as a result of your videos. I'm loving the old school rocketry but you my friend ..... I can't wait for what you are bringing to model rocketry. It's a hobby that you are at the leading (front of the line) edge of. Keep it up!!!

[@edwardcolhoun6360]

This is a really neat new direction for your projects

[@Galyxr]

I'm so glad you're getting into high power rocketry. This is where things get much more interesting...

[@radon1221]

your work is such an inspiration dude, the amount of work you do and the way we see it as a scaled down version of actual rockets is super fascinating

[@AirCommandRockets]

Very Cool! Why not make part of the air frame the pressure chamber rather than a separate tank? Water rocketeers have been doing that for years ;)

[@hamandbeef]

This is seriously amazing. Everything you’ve done is just so inspiring to me.

[@willempaternotte4071]

You can buy small co2 canisters, used for quickly pumping up a bike tyre. You can maybe use them for smaller scale rockets.

[@kanski9]

Miniature scale RCS is probably the coolest thing i've seen this year.

[@jakn5142]

This is so impressing! I just love all the technical details u get in these videos! Keep up the great work

[@MarcusHouse]

This is amazing! The RCS with give you a lot more control. Next stop... Grid Fins. :)

[@OrionAerospace]

Can't wait to see the RCS in flight! :D

[@trainorace]

Absolutely stellar! Can’t wait to see this develop further. Keep rockin Joe!!

[@pileguru3745]

In your next upgrade, the RCS thruster section should be a shouldered/full body width center section. This way you slip it in a 74mm tube that is the rest of the propulsion section, and an upper rocket section can slip over the top. As discussed below, when you get to roll control, you just use a smaller orifice for the jets and accomplish vastly reducing the thrust and still operate at the same pressure as the other two axis. This allows you to build a complete system that you can put in the middle of an existing rocket for testing.

[@toboterxp8155]

2:35 I really hope scuba tanks don't contain CO2

[@williamrose3413]

You have to breath part oxygen and part other gas because oxygen is toxic so...

[@toboterxp8155]

I will have to disagree with you on that. Quite some spaceships used pure oxygen atmospheres. The Apollo mission for example, until the oxygen set the craft on fire in Apollo 1. Wich was a manned, so the atmosphere was probably not lethal, at least while not on fire.

[@krijndees]

@@williamrose3413 if oxygen is toxsic we would all be dead

[@williamrose3413]

@@krijndees Oxygen is toxic when in high concentrations rather than the 20% we breathe

[@krijndees]

@@williamrose3413 we dont even have 20% and a firefighter told me that there is 100% pure oxygen in their tanks but not licuid and now you again say oxygen is toxic ITS NOT it even is better for us to have more oxygen if you look like 1 mil years ago there where much bigger creatures that are small today the day cause there is less oxygen so STOP saying that *oxygen is toxic*

[@henryD9363]

For roll control why don't you simply reduce the diameter of the nozzles proportionately. This would significantly improves the off/on/off timing that you have to achieve. In other words, you would have more time to play with to achieve the desired delta-p as applied to angular momentum.

[@neiljudell1437]

Be careful with PWM on the valves.... It tends to create excess wear, and can even cause stiction. And in many valves the PWM frequency needs to be too low to be useful.....

[@Husker5454]

Remember to factor in the weather and temperature when moving to CO2 . Temp effects CO2 which is why compressed air is more popular in stuff like paintball .

[@Phil-tl6ln]

If you want to do the throttling (floating valve) control of the solenoid, automotive engine management systems sometimes do this for idle speed control and turbo boost pressure regulation. A flywheel diode is essential and typically they are modulated at 20hz with a 15-85% PWM control region. Because it is impossible to know the valve position you need incorporate this inside your closed loop control somehow, whether it be an internal control loop with an angular speed target, or something else, I have no idea :S.

[@kalamazoopermaculture6405]

On your CAD, model the sharp 90 degree in the fluid flow will induce turbulence and cause a massive amount of energy loss... A smoother transition i.e. a 1/4 of a donut would be worth a reprint. Also loved the nerd out during the test. Industrial peroxide passing through a catalyst in the future??....

[@tombratfred3102]

Bear in mind that it also needs to be manufactured with reasonable ease.

[@MoneyManden]

Watching netflix but sees a new video from BPS.Space. It's called prioritising.

[@andylaweda]

Joe, I love your content. Great to see you on TMRO recently! Forgive me please if I can't support you on patreon while supporting Tim Dodd (day job) and TMRO ($deity's work) and paying my insane UK mortgage. With you in spirit Sir!

[@gerardnll2]

You are like a mix between actual macaulay culkin and Elon musk

[@vovanikotin]

Outdated joke. Lets back to science.

[@superbmediacontentcreator]

Have you thought of using the nitrous oxide capsules used to make whip cream (among other things)?. they are cheap, small, light and readily available. Further, the holders and valves are already available all over. This can also be scaled up when your system is perfected.

[@krijndees]

Thats a canister not nitrous but ok those small canisters are used in some airsoftguns too so he said it already

[@mariohernandez1111]

@@krijndees It's definitely nitrous oxide.

[@krijndees]

@@mariohernandez1111 it could be that wer talking about something else but i dont think the one your talking about doesnt have nitrous that would be higly flammeble but idk what type of canisters your talking about but airsoft cannisters are Co2

[@mariohernandez1111]

@@krijndees maybe you should check out your facts before talking. Nitrous oxide is used for whipped cream.

[@krijndees]

@@mariohernandez1111 i just said i dont know what cartridges go in there but i know airsoft guns use co2 cartridges

[@klab3929]

Next> Liquid-Fueled Rocket Engines(LFRE) Development :)

[@jhrch4389]

Lukas Bendiksen REALLY hard but I’d love to see that

[@klab3929]

@@jhrch4389 Making one is actually fairly simple, making it efficient is an hole other thing... but would be really awesome to watch

[@Chris-it4fe]

@@klab3929 it's not fairly simple, it hasn't even been done yet, it's really complicated

[@adamrezabek9469]

@@Chris-it4fe to be exact, it has been done, just not at model scale. And now that I think about it, small manuvering thrusters (like Draco) are model scale rocket engine. But it certainly is not easy

[@Chris-it4fe]

@@adamrezabek9469 wow, that's an old comment. Yeah it has been, but I meant an efficient engine which would take a large amount of time and money to get a prototype

[@MastaBlastaZDusta]

Have you considered using propane/butane instead of compressed air? Sure it seems dangerous at first but their compressibility is much better, and you could store a lot more gas allowing for more time to run your RCS. Also, maybe some clever design for electronic firing, and an optimised nozzle and you could literally fire them off :D But seriously, combustible gases are sometimes used in some hydraulic applications where the ability to store a lot of pressure is important. BTW all the best to you from Polish Synchrotron Light Source, I do have my own share of "space like" technologies here :)

[@JustJackOnYoutube]

I like it very much that you use metric to explain this, over time I've gained a decent understanding of imperial by now but it's so much easier to relate to metric, thanks.

[@sssssssssss440]

Great work dude! Excited to see its development

[@Thorgon-Cross]

This would work great if hooked up to the 300psi i use to pressurize my propellant tanks. Great that you guys are creating "standardized" control boards for amateur high power rocketry.

[@user-fj4mb5jh8o]

Have you considered precisely controlling the landing thrust by using 2 opposite placed motors that can swing out(in opposite directions, so the rocket remains stable) to reduce thrust and swing back in to increase thrust?

[@spacedoge3508]

The two motor's thrusts may be different

[@user-fj4mb5jh8o]

@@spacedoge3508 but you would be able to precisely control their thrust by vectrloeing them in or out, but vectoring them in or out would create a yaw force on the rocket. I guess this design wouldn't really work, it was just an idea.

[@user-fj4mb5jh8o]

@Matthew Hutchinson the inefficiency is not really a problem, these are model rockets after all. You could solve the problem of a motor burning out too quickly by designing the trajectory so that the rocket lands by the time the motors burn out, or you could point the remaining motor through the cg of the rocket. The main problem with this idea is that if the motors thrust curves were different, you would have to point them out at different angles to compensate, which would create a yaw force on the rocket.

[@spacedoge3508]

@@user-fj4mb5jh8o nice idea tho

[@spacedoge3508]

Wouldn't it be cool if it had retractable multicopter arms to land?

[@labratmatt7327]

I'm sure your neighbors love that thruster sound. Can't wait to see this get off the ground!

[@StefsEngineering]

For lower weight parts you could look into pneumatic RC retract components. Cool project! Looking forward to the next video! I'm not sure about the maximum operating pressure of those systems though, may be too low and not enough flow

[@ukwerna]

brilliant stuff, as always. Also - its important to chill, and imho, smoke, to counteract any artificial pressure..

[@krcnz]

Glad to see you back Joe!!

[@tomgeorge3726]

Great video, keep going. I like the way you challenge the different control systems and practically demonstrate them. You need something like a spare tyre to act as an air reservoir to give you longer testing time. The link to Charlie doesn't appear to work.

[@larsbressers1402]

Are you f*king shitting me. Yesterday when I went to bed I thought about making the exact same mechanism and next thing I see in the morning is this. Amazing

[@Junon15]

YEAH!!!! NEW BPS SPACE VIDEO!! Which is what I said out-loud, followed by strange looks from my wife.

[@swistak0220]

I knew that you will do thad eventually. Love your work. Have fun improving it!

[@i_Hally]

Nice work. Keen to see it's development

[@SamwiseGamgy47]

You’re killing it man. Keep going.

[@Lie1234567891]

I would be careful with using pwm to control relays as they contain moving parts. Maybe go for some solid state relays if so. Also make sure to put the solenoids far away from any delicate electronics because of magnetic interference, and use filters on the power. Are the thrust vector control and RCS working isolated from each other? Could be beneficial with some sort of common control strategy using LQR etc. Awesom video, keep up the good work!! 👍👍

[@sciencegaming6675]

Nice to get this video in my notifications!

[@sciencegaming6675]

and congrats with the RCS!

[@Gehr96]

7:05 Why are you using psi instead of Pascal? It's a little bit confusing tbh. Translation for others that are as confused as me: "I'm probably going to use a paintball sized tank at around 5.5 to 6.2 MPa which is then regulated down to between 0.7 and 1.4 MPa for the actual thruster ports. And the roll thrusters will be regulated down to 350 kPa to 700 kPa."

[@vlogsbyrow]

"If you're just trying to be practical, you shouldn't be flying model rockets in the first place." Joe's career summed up in one sentence.

[@StuHolmes]

Well done 👍🏻 Joe - great bit of engineering

[@0siiris]

Everything you do amazes me!

[@happyfarm1160]

Well that's what I wanted to see, this should help you to make your first successful landing!

[@corkymork]

How about using water and pressurized air as RCS propellant: think water rockets! Plastic soda bottles can hold 100 + psi. Or maybe reaction wheels to control pitch and yaw?

[@MaxJ345]

How do you manage to keep track of such complexity? It must be jarring to have to juggle the project as a whole and dealing with all the technical details of each module!

[@nighthawxx7888]

I love your creativity!

[@Astroditty]

I'm sure you've already looked into it but I could see CO2 canisters (airsoft) working super well with your smaller rockets.

[@WeatherWorld]

Amazing video!! Do you plan to make a larger Echo-like vehicle with thrust vector control & Reaction control systems combined?

[@TLout4675]

You should be able to reduce the weight by using a bladder system or use a section of the air frame to pressurize and hold the air. You should also be able to buy lighter weight or make your own air solonoids. If you pulse the valves it also uses less average current. Not sure of the cost but ultralife sold a gel type flexible battery you can form to the inside curvature of the rocket that is lighter. The battery and controller most likely going to be the most weight.

[@PROSCO_in_Space]

Love it. Thanks for all your vids.

[@DrewB0119]

Another awesome video! Just want to let you know how much of an inspiration you have been to me, and to keep trying even if you fail. If you are reading this I hope you have an awesome day!! :)

[@sunnyworld2111]

I love your videos. I hope i will see your first rocket in space soon. Big admiration from SLOVAKIA!!

[@moazelsayed6058]

"Hey Alexa... Why isn't joe asking you anymore? Are you guys not talking?"

[@doolittlegeorge]

Actually if you just launch the vehicle your 2 months become 2 minutes. I think the high speed filming and then slo-mo replay is what provides the near totality of any answers to any questions that may arise. "Only a question of $$$" now. Put together a good accounting spread sheet and do an IPO or funding round in San Fran and New York.

[@mamadoudiallo7690]

Good luck, you're doing a good job.

[@greg9408]

Dude, these videos are so cool

[@ElectricWheelz]

Given that your rocket will stay in the atmosphere, how would the energy/kg compare to using a drone controller, battery and four small props to achieve the same thing? I guess you would need to minimise the drag caused by the props but it might be offset by the weight savings?

[@joflo5950]

I love the Idea! Actually, I am thinking of using cold gas thrusters in a project of my own, but I am not sure whether the force will be sufficient. How did you calculate the Force of your own Thrusters?

[@MarcStollmeyer]

What about using a little bb gun co2 cartridge? Very light weight, just needs a valve that can trigger and detrigger within milliseconds (so a regulator isn’t necessary). Also, could you show us what valves you used in more detail?

[@XrollhaX]

Do you have to use that shape for the tubes to release the air? I watched a math video about using isochronos curves to make balls drop faster. It could make those jets release faster.

[@ApacheFPV]

You should definitely look into machining your own small pieces, I keep picturing this surrounded by those small round mono prop tanks on KSP, just miniaturized lol

[@hedgehogchaser2494]

I’m convinced you are the coolest guy on KZbin. And you look like Musk.

[@kianhoppe6881]

Just finished watching the video! Great video as always(quality over quantity). Glad to see your RCS system come together and to have great success. I would like to ask one question though. Has Scout D been scrapped or is it still a work in progress? Again glad to see one of your videos as it always brightens my day!

[@BPSspace]

Thanks Kian! Scout D is sitting on the pad, ready to go. Launching it in a few weeks to test some new flight software!

[@kianhoppe6881]

@@BPSspace That is great to hear thank you!

[@wsshambaugh]

PWM is basically the same as having a high enough flight software frame rate, I don’t think you need to get fancy here. I’d also be surprised if you could cycle to solenoids fast enough to get a rate much more than the software refresh, so the benefit of pwm would be marginal.

[@szeperator1649]

Can you make some more technical videos which show the math and programming? Really interested in that part

[@infofrancois5608]

Congratulations Joe, that's a great new idea. Will be perhaps better to use proportionnal small Rc valve type with Rc servo actionners. The answer will be proportionnal and you will save a lot of compressed air and weight for same result. Will be also much lighter and efficent. Go direct to simplicity. Why designing heavy when you can do it light...

[@deldrise9169]

So cool, congratulations.

[@robertvonkulig801]

Silly question - why not a denser medium or working fluid like water? More mass = more thrust per discharge and maybe less pressurising gas??

[@robertvonkulig801]

But wouldn't cold water be better than cold gas? I know exhaust would be slower but the mass would be much higher - what am I missing here? Cheers for chatting.

[@robertvonkulig801]

Humph! Sounds counter initiative to me especially as he is talking high pressures already....I'll have to play with this. All the best.

[@droezjjj3927]

How? Why? Why are you so smart? Why are you so cool?

[@enigma2536]

He is Elon

[@cesarrosatti1211]

Hi, great video right here. I wanna ask where to look for posibly reading about the electronic part for the RCS. I want to build one for my final proyect at university next year. Greetings from Argentina!

[@r62144]

Hey man. Theses videos are amazing. I’m currently 17, about to be 18 and plan to go to college for mechanical and aerospace engineering. I am fluent in solidworks, and have a really creative mind that is capable of great things. Are there currently any job openings, or possibly future job openings? If so, I’d be interested

[@bradley3549]

When you say paintball tank at ~800psi - are you talking high pressure air, or Co2? The gas volume and weight will vary significantly. If Co2, plan on something that can deal with phase change energy or you'll be freezing up everything.

[@dewexdewex]

Would it be possible to build a lightweight composite pressure vessel to contain the exhausted energy from a black powder motor within a rocket? If so, would a control system to release this be practicable, or would the exhaust particulates cause too many problems in valves and nozzles?

[@guillaumespecht4837]

I love what you do! + do you think spacex would be interested in sponsoring you and your company (to build more spacex rockets or any other ones)? Keep doing what you do!

[@amaljerry5373]

Your projects are crazier than ksp!!

[@puuspace7477]

Hey Joe! Ever since I discovered your channel, I have been very interested in all of these amazing things you are working on. And I was was wondering. You were selling the Signal R2 for a while, but will you sell more parts? Possibly the landing legs, and other components. I am really interested in your Echo landing tests, and I think it would be awesome if you could sell some more of the components and parts you are making.

[@YukonK9]

Joe you forgot to put the Thug Life when charlie started welding the 2 disks together

[@munzlp]

We almost reached 50k let's go!

[@kyleeames8229]

You can probably reduce weight and get more control authority/more RCS burn time if you use propellant grade hydrogen peroxide with silver catalysts. Lower pressure, thinner tanks; the advantages are numerous.

[@kyleeames8229]

If you can’t acquire propellant grade h2o2, the use of some kind of chemical gas generator with a downward pointed bleed system (more thrust) may also be a good idea. I don’t know how easy it is to get pure/nearly pure hydrogen peroxide. It’d need to be about 95%.

[@calistohuettich]

It sounds awesome.

[@tsmspace]

Have you considered using a Betaflight flight controller for any of these trials?? I feel like if you used a Betaflight FC you would find the board is very well equipped,,, and you MIGHT even be able to use Betaflight.

[@tsmspace]

I think FPV is a big future for model rocketry, , with a variety of applications for example, hovering over a landing pad, flying laterally, or even racing,,,, and can't help but think that a top quality FPV flight controller might just be also the best thing for rocketry.

[@nucspartan321]

Joe can you make a video of what classes you suggest we take in uni to learn the main skills you have?

[@pinochet3317]

Hell yeah this is awesome!!!!

[@guatagel2454]

Nice work, thank you!

[@simonyun1883]

You can use compressed helium gas in a custom made aluminum air tank to reduce mass.... not a science person, but interested into what ur doing :)

[@silvialuch9255]

I have a question tho: why do the rcs engines produce a white trail in space? Shouldn't the gas be invisible in the void?

[@qsdqsdqsdqsdqsdsdqsdqsdqsd8444]

that's really sick

[@OriginalAntbox]

Have you though about injecting alcohol in to a small venturi nozel with a white hot glow plug? (To expand gas not ignite)