Liquid Rocket Engines 9: Pneumatics and Moving the Main Valves

[@nateg6320]

Kid....you have a heck of a career coming your way. I’m sure you will be at the foundation of great innovations in rocketry, and space exploration.

[@airplanenut6242]

Great video! I’m the lead for the Portland State University rocketry club’s test stand. We had just about the same journey as you - we started with a plan to make custom electric actuators for our test stand and are now almost entirely pneumatic-operated valves for cost, reliability and spring-return functionality.

[@loganfernandez5251]

I’m in charge of the valve and actuator system for my college senior design team. Thanks for keeping these videos coming, they’re a good resource.

[@robertonegrin9001]

Gracias Charlie.

[@spb1179]

Wow a recent addition. This series is awesome. Thanks for this so much! Looking forward to seeing what becomes of this rocket and test stand

[@SurfyKirky]

I’m looking into building my own at some stage, this has been a great resource for ideas. The hardest part for me is trying to learn how to build one without the formal knowledge to do so. Keep it up

[@stekra3159]

Tanks for being back and going in to way to much detail :-)

[@robertsteinbeiss8478]

Now finally there are two Charlies. Double the fun!!!

[@bill_ruppert]

It’s great to see a new video. Very good. Also I’d love to learn more about your new job and the company you joined.

[@abhinavprashant2213]

awesome charlie really look forward to ur future endeavours huge fan of ur channel me making my own TVC model rocket btw

[@Turcian]

Wohoo, you're back!

[@chrisjenkins9978]

Now we’re cookin' with Fire!!! 👍🏼👍🏼👍🏼

[@heysiri4935]

Keep up the awesome work! Can’t wait to see a full duration test fire!

[@solidrocketmotor9871]

Nice one! This is definitely gonna help with my own rocket journey

[@AerioC]

bruh pretty epic. meawhile i cant even properly put the bed covers on my blanket you out here doing literal rocket science

[@bishwayan2410]

Seeing you is like: " Once in a blue moon"

[@joeymurphy2464]

Not sure if you went over this, but why in your demo at the end do you have electric solenoid valves which control pneumatic valves which control the fuel flow? Why can't you use an electric valve to control fuel directly? My guess is that it's similar to using a transistor/relay to control high electric current, and that using direct electric control would have difficulty managing that big chunky main valve at the end, but would be great to have that confirmed. Also, I loved the transition at 6:46 when Professional Design Engineer Charlie got up and Super Cool Hardware Building Charlie took over.

[@AstroCharlie]

The MPV's need very high CV's and they need to work at high pressures, these are not traits easy to find in COTS solenoid valves (not that I know of any 1" solenoid valves anyway) but are easy to find in pneumatic ball valves.

[@adrianmoisa2281]

@@AstroCharlie Major fan here! I'm in love with the level of detail you include in your vids. I hope I can bring into your attention a rather cool project for Mars colonisation. nexusaurora.com/welcome.pdf. I'm the founder of Nexus Aurora and I'd like to get in touch with you for sharing the material we are producing nexusaurora.com/report.pdf. Drop me a reply if you are interested to dedicate some air time to this community project. I'll be quick to reply. Regards!

[@matthewsnyder4211]

Favorite KZbinr

[@matze1508]

I like the hands-on examples you can show when building this whole system. But for the animations it would be way easier to show it with the symbols for the valves from ISO 1219. Im pretty sure you have a schematic diagram somewhere anyways (maybe even simulate the system with something like Festo FluidSIM to see where the flow goes, when you switch the different valves). And introducing the audience to this standard form of displaying the different elements of fluid handling gives this another nice educational touch. Also If people are a little bit familiar with this matter, they don't need to relarn/ completely think through the new way of displaying the same kind of information. But in the end you are making the effort to put the videos out and not me, so you are in charge :) Just trying to give constructive feedback for future content. Hope you understand. Loving your enthusiasm for the topic!

[@joshmellon390]

I just found your channel, and I also found a lot of very useful information. I'm doing basically the exact same thing you are, but no MIT lol.

[@cheese_man3464]

Could you plz be more active on your KZbin page its really fun watching your videos

[@Ameliaross106]

I’m so exited! I can’t wait for more engine hardware to come in. When do you think your going to have some time to livestream ksp or something

[@PauloDutra]

Niceeee couldn't wait more for some updates!

[@PeterKocic]

I haven't even seen this yet, but I'm thinking - "Charlie G needs to make more videos"

[@jab9934]

Amazing!! Will you upload new videos?

[@jab9934]

This is a great series

[@theelectricwalrus]

Pneumatics: where the threeway is normal, and anything smaller isn't really useful

[@avirajpawar7198]

i am really learning from ur video and also implementing it in my small projects :)

[@wolfvierbergen1417]

When will there be an update? I look forward to the next epsode!

[@TylerSimsMechanical]

That's some really sexy looking equipment you've build. Thanks for the great video.

[@itemboxes8741]

Excellent video, highly informative and enjoyable as always. Hopefully your hydro-static pressure testing goes better than Starship's.

[@avirajpawar7198]

thanks for this wonderful knowledge

[@hafizuddinmohdlowhim8426]

So you did manufacture your nozzle. We can see it back there.

[@stardust4841]

Very educational video!

[@googlekonto2458]

For 3d printing your engine bell you could consider a new ceramic polymer resin that can be printed on any cheap resin printer, and then theoreticly be sintered with a blowtorch, withstanding 1100 degrees C with the resin burned out (it obviously has a lower tensile strength than stainless steel ). The one from Weistek costs 60 bucks per kilo

[@Lucas-ci7rm]

We want to see more episodes. More.

[@balkedaquino1268]

where you been man?

[@nathanaelwebb931]

Amazing video!

[@simplerocketscience6222]

Cool video! You inspired me to build a small hybrid rocket engine. But I keep messing up the nozzle expansion ratio

[@jeppet8479]

When will the next episode be ready?

[@localhawk1]

thank you very much (finally a new video :))

[@gauravpardeshi5573]

Yes yes

[@thecros1076]

Hey community , had a question . Using pneumatic ball valves seems great but won't it have problems in ignition sequence as at the start to have a stable ignition source you have to run the engine fuel rich and then ox rich and then bring it to full operation . Varying the amount of fuel and oxyegn can't be possible in these valves as it has only two states . Charlie how do you adress these problem with respect to hard starts.

[@SurfyKirky]

Just on your tanks, have you considered the ball lock kegs? Will give you individual vapour and liquid line. Unsure what the fittings are rated to but could provide pre made with flared fittings.

[@ethanedwards2572]

your videos are great

[@matecser7256]

Hi, I'm a high school student from Hungary, dreaming about a career in the aerospace industry. As far as I'm concerned, you have graduated from MIT. Do you think it is worth it to try to apply as an international student or it is just a waste of money? Does MIT really live up to it's reputation or I could get a similar education in some European university? Thanks for your reply. BTW keep up the great work! Your vids are awesome :)

[@joshuabarosin779]

Hi, I am a senior in high school here in the United States, MIT is THE best school in America. If you want to apply to it go ahead, but you should look at other schools in the united states. Not to mention colleges here are expensive, but it may be different for international students.

[@HaraldSangvik]

TU Delft comes to mind when thinking of European universities having aerospace engineering.

[@manvirsingh3727]

Charlie how can we estimate pressure inside combustion chamber the propellants are Lox/Kerosene

[@t72oftruth66]

Can you please cover the ED nozzle?

[@manvirsingh3727]

Hey, Charlie I'm reading how to design build and test small liquid-fuel rocket engines is it recommend by you to a beginner btw love rocket videos

[@AstroCharlie]

Yes, absolutely! It's one of the best documents out there.

[@manvirsingh3727]

@@AstroCharlie thanks

[@iainmacpherson6858]

I noticed when you were sealing the threads you used the teflon tape in on the blue reel didn't that mean that it's only rated for water . Unless it's different there but the gas rated stuff here comes in a yellow reel

[@AstroCharlie]

The blue stuff is thinner, but other than needing more wraps, there's not really a difference. There's some nuance for tapes with anti-seize and other embedded lubricants, but there's no code inspectors for rocket test stands.

[@iainmacpherson6858]

@@AstroCharlie ahh ok was just wondering ive just always used the other stuff because it's about. Also would you have any tips about learning tig welding I've done mig and stick but tig I just can't get the hang of

[@AstroCharlie]

A good teacher and practice are the best tips I can offer. I found it similar to drawing.

[@ForkInTheButt]

Menos cohetes y mas rock and roll charlie

[@oskar5156]

How do liquid rocket engines actively measure chamber preasure? I mean is there even preasure sensors that can withstand those temperatures?

[@eischei]

Pressure and temperature don't have to be high at the same time. just have a very small pipe going out of the hot towards the sensor, and have the sensor somewhere where it is cold enough for it to operate.

[@גבריאלפאלקאו]

When are we seeing a test?

[@ameexxettri7578]

hello sir what about the turbopumps...i think that's a important component too in the liquid rocket

[@jeronimocaceresguido282]

This is a pressure fed rocket engine, turbopumps is too complex.

[@psyxiatros1]

Hello Charlie et al. Lol I want to ask a rather stupid question (or two) If I use lox and liquid methane as propellants, in what form are they injected in the thrust chamber ? As liquids ? Or as gases ? If a cryogenic liquid goes through pipes and valves and pumps and heat exchangers doesn't it use or make energy as it transforms to gas ? Forgive my stupid questions but chemistry was not my forte Thank you

[@deltuhvee]

They are usually liquid if they go straight into combustion chamber from tanks. If they pass through a jacket to cool the combustion chamber/nozzle as part of a regenerative cooling system, the temperature will turn them into a gas and they will be injected as gasses.

[@psyxiatros1]

​@@deltuhvee Thank you very much man. Usualy its the fuel which pass through the nozzle and chamber to cool them. Right ? So again Oxygene should be liquid and Methane... gas .

[@deltuhvee]

@@psyxiatros1 yes, usually the fuel, but oxidizers can be used as well. Some designs use one to cool the combustion chamber, and the other on a separate loop to cool the nozzle.

[@thomasstinnesbeck6017]

and it doesn't freeze with LOX?

[@its_Duperman]

Any position sensors on the valves?

[@fredricchopin5607]

Love the video Was wondering if you had any tips that you would say could help me to get into mit

[@benjaminjones3351]

What tube bender do you use?

[@michaelscustomguitarstraps4830]

I just started designing a project on this exact thing. I’d love to get some opinions from you on it!

[@williamgorham7339]

Are you currently in the industry currently or finishing school? Also are there any degree programs for Aeronautical Engineering that can be taken online that you know about? I am currently working full time as a health and safety senior technician for a petrochemical company so full time face to face classes would be a challenge. Your videos are very informative on liquid rockets and are very well structured!🚀

[@AstroCharlie]

I'm a propulsion program lead at a satellite maneuvering company. I graduated in 2019. MIT offers many of it's courses through OCW online to anyone.

[@williamgorham7339]

Charlie Garcia thank you so much for this information. I hope your doing well in propulsion and that you don’t have as many surprises as what is discussed in Ignition. Also I am curious if you have theory on why ozone still explodes and do you ever see it becoming a viable oxidizer since the energy density is so much greater than LOX? Or are the issues with handling liquid ozone not worth the gains?

[@aymenassabir8314]

Pls hunga bunga need video

[@omanomani4618]

Does he reply to anybody? I want the jet that congress out to be like a line. Which does not spread after exhaust.

[@reubenfarley-hall2064]

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