Liquid Rocket Engines 5: Main Propellant Valves

[@BPSspace]

Looking great, Charlie! 10/10 audio and video, love the foreshadowing :) The clarification of what the 'design phase' means is also excellent.

[@jackzybutz]

U guys gotta team up ngl

[@YukonK9]

As the videos progress, the camera is getting closer and closer to Charlies head. Nice haircut Charlie!

[@maxk4324]

If you are using teflon o-rings (ie most common type of fluoropolymer o-rings) make sure NOT to use teflon grease. As a general rule of thumb, like dissolves like and so using teflon grease on teflon rings will slowly weaken the seal until one day BAM! Keep up the amazing work, and looking forward to your next video!

[@CanineDefenseTechnologies]

Bucket of Krytox+ 5,000 dollars= Tesla Model 3

[@ravener96]

Bucket of krytox + 2 cups of krytox = Tesla

[@OrionAerospace]

The production quality keeps getting better in this series! Good work man!

[@raziberg]

thank you so much for the solidworks next to you while you're talking. everything was much more understandable :) just one thing I think you should zoom out a bit, everything is a bit too close.

[@BrusnickiRoberto]

Dude, I met you at MIT some years ago. It was pretty cool to find your channel. Just a quick tip: the unscripted talking was WAY better. You would certainly get more subscribers if you stuck with that. Good luck!

[@johnlivingston37]

You might want to center the lead screw in the plane of the valve lever (or as close as possible) and attach a traveler which can engage the valve lever from both sides of the traveler. This will minimize possibility of seizing and remove the need for a guide rod.

[@AstroCharlie]

Unfortunately the mounting features for the valve occupy that same plane... Definitely worth some thought.

[@DiegoGomez-pk5tg]

Charlie where did you find Krytox that is cryogenic? All I've been able to find is Krytox compatible with temperatures down -100 degrees Fahrenheit, but nothing lower like for LOx

[@TheTyno37]

This was my favorite episode, by far. Hearing you talk about the design pivots in real time was amazing.

[@AirCommandRockets]

Looks like an interesting project. Subscribed. :)

[@Arnogorter]

Looks like a pretty compact solution! I recon you should maybe move the guiding rod as close to the lead screw as possible to reduce the chance of the traveller digging in and getting stuck. Either that or put a tophat into the traveller to give it more surface area to slide on!

[@djrosu1]

Love the videos. Why not just use a high-torque servo? Readily available from places like hobbyking and cheapish.

[@chancepricee]

When Charlie gets a haircut and zooms in for his videos. What a glow up. Love the videos Charlie!

[@xxtheslowmoxx8045]

Unless there is an extreme Temperature Gradient across the Potentiometer it would still work, because it is a Voltage Divider. If the Resistance of one side changes the other one will change aswell.

[@mihailazar2487]

my god, that's gotta be the cheesiest intro I've seen in a while it's not bad, necessarily, it certainly doesn't detract from the fact that this is a good video about amazing highly technical rocket stuff, it doesn't make it worse, and it's certainly better than the self-srrious intros useless vlog channels use, but still ... that animation tho it's so bad it's good like if you're using comic sans in a leaflet ...

[@Avida-l7s]

you are smart and handsome. I hate you. Just kidding, thanks for the video.

[@ryanrussell6922]

as an ME that graduates in 3 months you really make me want to go back for grad school

[@mytechguis4133]

Dude, Please Make more of this like every day, Seriously can't wait to learn this...

[@aayushgargofficial]

there are 9 guys disliking every video. not me though loved it.

[@Villains_Nate]

bump for the algorithm! excited for episode 6

[@vmiguel1988]

The hair is much better now 😍

[@Haydy5040]

you do not need that grease brand ...

[@Xailow]

Good luck on the interviews!

[@ehtikhet]

This is going to be awesome!

[@oriondias1184]

i personally would have used a servo for the valve actuation. you can get a 60kg one that relitivly light and the setup may be simpler. AND. you get positional accuracy too all in one package.

[@Thorgon-Cross]

Vent hole in Lox valve so it does not blow up when closed..... DAM, i am glad i saw this before testing my Ethyl/Lox engine. A Lox valve blowing up after the test would be embarrassing, also has a high rick of harming anyone near by.

[@MarkFunderburk]

I can't imagine this is actually cheaper than using a pneumatic actuator? I was pricing out some for our valves and was able to find them for under $100 pretty consistently, add about $30 for a solenoid then you just need to mount them together. Assuming you have nitrogen/air onboard anyways. This is probably more compact though, the way you talked about the water jet makes me think you have free access to one so I can see why you would leverage that if it's the case.

[@mdansar8881]

I love your videos man! So good, I'm learning a lot. I might actually start designing one liquid rocket engine in my first year(gonna start like about a month from now). I even got this book "Modern Engineering Design of Liquid Propellent Rocket Engines by Dieter K. Huzel and David H. Huang(Updated by Rocketdyne division of Rockwell international). Great read.!.

[@olivier671988]

good explanation for the valve, good luck for this project. I just wonder how you will get lox ...

[@S4M3350]

Verr intrstn bot nw licke

[@mdansar8881]

Hey take a look at solenoids valves! There are cryo capable vavles, not that expensive.

[@geoffmatthews6283]

I'm now glad that I hung on to my little tube of Krytox.

[@PauloDutra]

(Not) First! Awsome videos ! Pls make more :)

[@korczakxyz]

very interesting project, i am waiting to see more :)

[@tolga1cool]

That's quite the expensive lube...

[@Haydy5040]

also I would totally buy some valves from ya

[@jjamanda]

Could you cover solid fuel with the same amount of expertise super video series thank you

[@AstroCharlie]

I definitely plan on it, but I only have so much time and money in a week, so starting the solid series would cut into my liquid engine series right now.

[@mdansar8881]

Hey what about the propellent tanks? They need to be capable of handling very high pressures right?, and for the cryo liquid oxygen which material the tanks must me made of? Stainless steel?

[@HaraldSangvik]

Alu also works well for cryo. Alu is actually stronger at crygogenic temperatures.

[@avid0g]

301 stainless!

[@filipurban03]

What a great series

[@bocajnamyerf]

Nice job!