https://youtu.be/RYY8_AId6QA?si=MNbJADY3pyCqieSM

I want to make a multistage rocket. Which seperation type should I pick? And how to do it?

Hi guys I have 2 questionsabout determining ınjector element pattern on manifold. First how can determine the locations of element ı couldnt find any resources and second are there any resource that you can suggest

What is the best(also cheap) enclosure material for average size solid motor(80mm:1m). Will plastic tube work for this?

Really need some suggestions on which rad hardening flash storage to use on our rockery payload that is available to purchase and work with STM32H7 MCUs. We need 8Gb storage capacity and few dozens mb/s write speed if possible🙏 I just can’t find one available to purchase in Canada. lol

Hi all, I had a friend loose a rocket today in Ohio, Illinois at the launch. I was wondering if anyone on here was there and had seen it? If you have any info please HMU!

Extreme beginer her,e want to start doing rockets what are some good starter rocket kits on a buget.

Hey guys,

I'm trying to design a CD nozzle with the exit to throat area ratio 4:1.

The throat radius (Rt) is 0.125 in and the exit radius (Re) is 0.25 in.

If I consider the half angle (θ) of divergent section to be 15 degrees, I get the length of the divergent section to be 0.466 in. Using this relation:
Lc = (Re-Rt)/tan(θ). I found this formula in the rocket propulsion elements book.

My question is: how do I calculate the length of the convergent section ("B" in the image below)? books say it doesn't matter what the length but then how would I ensure choked flow (Mach 1) at the throat? I need to have supersonic flow out of the nozzle.

Also, what would be a good estimate of the length of the chamber before the CD nozzle? ("A" in the image below).

Thanks a lot for the help!

https://preview.redd.it/m6qbgpq6gxzd1.png?width=928&format=png&auto=webp&s=97b92752c834ad7cf3d32eb0557a22172bb78c2f

Why is the price for a madcow g12 fiberglass tube like 3x the price of a same length mach1 tube? As far as I can tell they are the same (similar thickness and both filament wound).

https://preview.redd.it/bng4wdr5fxzd1.png?width=1409&format=png&auto=webp&s=acbcbbd2cac2d798566a4417c90844aea1ea55e6

https://preview.redd.it/9spj0b48fxzd1.png?width=1211&format=png&auto=webp&s=bf7e553a236462f3a8349441168a1fc1cc3d6cff

What are the common ways teams cool tanks on the pad at FAR? Is it common to use heat exchangers?

For context, our team is trying to keep 2 nitrous supply bottles and our flight tank sub-critical while on the pad.

How are the center of gravity and center of pressure placed for starship to be able to perform its belly flop maneuver?

Does anyone know what this is? Found it in my yard. I live near a military base and a regional airport which may or may both be related. Any ideas?

It is my understanding that a membership of the NAR includes some insurance coverage, but obviously only in the US. Outside the US, what would be the way to go with regard to insurance? I've contacted our national model flying union, and their insurance does not cover rocket-related activities. In general, when should one consider having insurance?

This was an ABS finocyl grain mandrel coated with epoxy and heat resistant paint. But it melted when the propellant paste was added.

Any solutions on how to get the finocyl grain ?

So I made a little blunder and my Launch Lugs are 1.6mm larger diameter than my launch rod. Is this gonna be an issue? It doesn't seem to move around too much but I'm worried about it due to lack of experience.

Hey guys, (SOS) So recently our team had started up a TARC club out of thin air and have only been designing our rocket for two weeks. Qualification flights are also in two weeks... and we're on a crunch. So far with the zero experience that we have we dove headfirst into a bunch of tutorials on how to use openRocket and this is what we have conjured up:

• We have a 3D printed nosecone printed out of PLA thats connected to a 2.7in upper body that (should at least, lol) store two hens eggs and an altimeter
• Below that we have a 3D printed (filled) transition that should be made out of PLA connected to a body tube that holds an F-40W10 rocket motor.

It's not looking so hot right now, and are aware that openRocket simulations are not that accurate but thats what we have as of right now to go off of, as it says we are reaching 800+ ft, when it should target 790. If you guys have any tips or concerns let us know and your input would be greatly appreciated into helping us grow.

EDIT: Our Simulation Graph keeps getting deleted, if you want to take a look at it, let us know.

https://preview.redd.it/46p59jijvszd1.png?width=1806&format=png&auto=webp&s=fcf4386a959b1893c91a16c7d6ada45e6cb09df2

https://preview.redd.it/hmaw7d90vszd1.png?width=1914&format=png&auto=webp&s=a250a12302530683d6e7d47ebcc24ab13054643b

thinking somthing like HTP( high test peroxide) or LOX ( liquid O2

Launching this tomorrow with an AeroTech H195 29mm. Simulated apogee is 5200’. 3D printed using PLA for fins and nose. LW-PLA for the e-bay and transition section. Has a microprocessor with pressure sensor onboard. FG’d the fins and added 280g of steel BB’s to the nose. Gunna be a good time.

I have a launch rail made of a square aluminum profile - the spacing for rail buttons is 5 mm.

Now, the official rail buttons are $7.5 for two, which is quite pricey, I think, for two small pieces of plastic. So I'm thinking: Can I make them myself? Any experiences?

Hello, I am in the process of a school experiment. I need to find sugar in different mesh sizes, how could I do this?

I've been trying to model the efficiency and performance of some theoretical rocket engines I'm going to be using in a story I've been writing. I have a STEM background so I've got a fairly good understanding of the mechanics of the equations themselves but I'm still (of all things) not sure what units are specifically used in the equations for Actual Exhaust Velocity and Effective Exhaust Velocity. Explanations in Metric would be preferred, thanks.

So, I made a post of my Estes Leviathan, rockey I built and it was a hit. Here is my problem, I started building rockets to get my five year old nephew into learning how things work and how to use the brain and the hands at the same time. He loved it so I decided to look into building some bigger rockets and get into a club and get certificates to launch big stuff. So here is my problem I am having. I went to mad cow rocketry and bought what was listed as L1 certification rockets. I made a massive mistake I think, I went with the Super DX3 rocket. I have no idea what I was thinking and got the 54mm engine tube. Well I started building it. My problem is I think 54 is too big, I can’t find any engines in stock to buy so I can balance this thing. I hope I am not screwed as I am in this a lot of money, I bought a camera, alt, etc. I want to still be able to get this baby off the ground in the summer. Is there any options for me?