This is my first r/rocketry post here.

Engine: CESARONI-L1050

The rocket had a lenght of 2310mm and a diameter of 129mm.

Teknofest changed the engine for the upcoming years. This was a high school rocket and many teams had this problem. My job was to Electronic, PCB, software for the flight controller. You can guess, It broke apart a little.

I have a degree this competition. My team and I won first place in 2022, and finally I joined competition in 2024. We came in 6th place out of 32 high school teams, We didn't get full score because shock cord snapped at apogee.

We'll join again, but i am now university student and I haven' got my hogh school team. The all team memebers will change.

i have a bt-60 tube but when i put the centering rings on it doesn’t fit

A motor igniter used to ignite my tested motor actually just a kraft paper motor and will be developed to use on a bigger real motor

Thirteen cycles — pressure-fed, gas generator, staged combustion, full-flow staged, expander, electric pump-fed, solid, hybrid, ion, aerospike, rotating detonation, nuclear thermal and air-breathing combined cycle — each one explorable in 3D in the browser, with exploded, cutaway and propellant-flow views.

Outer dimensions follow published figures and every source is listed on the page. Internal layout, injector patterns and feed systems are representative, and I say so on the page. I'm a 3D artist rather than a propulsion engineer, so corrections are welcome.

No install, runs in the browser: https://farsidelab.com/concept/rocket-engines/

Hey Ya'll! It's me, Rocket, from Rocket Vlogs.

I just did an interview with Thomas talking about "Chunc," his hypersonic(ish) rocket that he flew at BALLS, and thought ya'll might like to check it out.

https://youtu.be/RIPNPn_WE6Y

I almost missed it, but I managed to get some good photos. Shot on an iPhone 17 too, I really didn’t know it could get images like these.
1st one is my favorite, I’m sure you can tell why.

My high school group is doing a project based on rocketry and would appreciate anyone taking this quick survey about rocketry.

Im new to rocketry so wanna get smooth with rocket flight simulation first.

Any best fit softwares you guys know, I'm all ears.

I just got my L1 and now I want to try dual deploy what is the best kit for duel deploy on an H or I motor?

What should I practice, read so I can build understand and rockets as a pastime hobby. Thank you guys. 😁

I'm a core member of an established space club at my community college. We're hoping to compete in the IREC 2027 competition in the category where we launch a two-stage rocket to 30,000 feet, but we've heard from other teams that this category is essentially impossible without substantial funding for parts and materials.

Our main challenge is securing funding for our team. Our college has participated in IREC in 2023, 2024, and 2025, qualifying for the competition each year. However, because club leadership changes every year, we've struggled to maintain our sponsorships from one year to the next.

Could you please advice on how to find new sponsors and, more importantly, how to maintain those sponsorship relationships and funding over the long term?

295 players drew a falcon 9 to scale. the typical guess was 194 m. the real rocket is 70 m, so they made it almost three times too tall.

my hypothesis: rockets have no scale for us. launch footage shows them alone against the sky, with nothing next to them. so every big rocket should end up the same size in our heads, no matter how big it really is. the game has more rockets to test it.

and it held. the sls (98 m) came out at 210 m, the saturn v (111 m) at 150 m. three rockets from 70 to 111 m, all guessed at about 150 to 210 m, and the smallest of them got almost the tallest guess. only the little v-2 (14 m) stayed small, at 12 m.

so "big rocket" seems to be one size in our heads: about 200 m.

4 in 10 guesses came from the us, but it's not a one-country thing: americans drew it at 198 m, brits at 207 m, the rest of europe at 172 m.

more visuals, every guess and the raw data: https://roughly.is/blog/falcon9-guessed-too-tall.html?s=reddit-rocketry

I have been fascinated by rockets my whole life and I want to start, but I don’t know where to. I live in Western New York and I am a high schooler, and can’t find any clubs that offer rocketry near by.

do we have to take like license, permit or smth before launching a diy sugar rocket?
and from where?

I'm making an essay​ for my aerospace engineering class, its about rocketry obviously. This part is on the thermal protection section, it is about how well common materials protect materials while also being cheap. In my example rocket motor, the chamber pressure is 800 psi with 65% KNO3, 17.5% sorbitol and 17.5% sucrose. There are three grains, two bates, and one 4 finned finocyl.

HI guys, I know this is mainly for real rockets with real motors and stuff but sadly solid fuel and rocket motors are highly illegal in my country, so I have to stick with water. We are doing this for a school club and would love to know what we can do to get it to max altitude. Should we used 4 2l bottles spliced at the end and attach them? Some sources say that going above 70 psi is not safe but I feel like I should go higher. My idea was sand down the spliced ends and then boil down one part, connect them via PL Premium Polyurethane or epoxy. Which one should I use? Then after, we attach the nose fins etc. What should I keep my weight to? is there anyway to improve this design or do I need a new one? should I go for 4 bottles or go lower or higher?

I appreciate any answers!!

So I am trying to design a motor mount for my rocket which will use an Estes D12-5 motor.
I saw this guy's video and he has used some sort of 3D printed plastic(not so well informed abt 3D printing). What I am not able to understand is that won't the plastic jst burn off? I have attached a photo from where the motor will be ignited. And if he is not using the usual 3D printing materials
then what is he using to possibly avoid the nozzle melting off.
Here is the video's link- https://www.youtube.com/watch?v=2XsB_wGVZ2c

Im working on a project that will be manufactured next year. I am currently designing and stuck at a point. Rocket nozzle is one of the most important part of the motor and it will face heat pressure and lots of stuff. So i wondered how we can choose the best suitable nozzle for the project. Are there something like books for materials or places to know. Please share some sources you use for me, thank you.

Picked up a cheap star Hopper kit as a bonus gift for my son, obviously didn't think too much at the time but the engines are like rocking horse crap.

Any suggestions for alternatives that are actually available in the UK?

Ive built a short lady pulsejet based on Larry cotrills design at home and it's firing. Can get it to almost run but as soon as I take the air compressor away from the intake it dies. Will go fine until this point though. Does anyone know what factors I could change to try make it self sustaining. All help appreciated!
Edit: by almost running I mean it's rumbling and the ignition can be removed as long as air is stil being blown in.

Complete beginner here. I'm building my first ever model rocket and decided to use an F-35-8 motor. According to OpenRocket, it should hit around 863 meters and have a descent time of roughly 170 seconds. I really want to avoid adding GPS as it would make it heavier. I'm adding basic sensors like the BMP280 and MPU6050, but don't want to design, buy, and set up a ground station for GPS. I added a buzzer just in case that activates when the rocket hits the ground.

There’s a question that’s been on my mind for a while. I ran into this issue in my own rocket engine project as well. The partition is secured to the body with screws; while the shear strength of the screws can withstand the internal pressure, wouldn’t it be very difficult for the screw holes to withstand that pressure?

To give an example, in my engine design, an aluminum tube with a wall thickness of approximately 2 mm can withstand the combustion pressure. However, based on Fusion and my own analyses, I concluded that the screw hole would not be able to withstand it. Therefore, I increased the wall thickness to expand the screw contact area, but this time I experienced a loss in efficiency due to the increased weight.

Two solutions come to mind here: either using more screws or resorting to methods like bonding with epoxy resin.

Perhaps I’m mixing something up in my calculations. To briefly explain the rough calculations I’ve done:

First, I calculate the force in Newtons (N) by applying the pressure to the diameter of the bulkhead wall in the combustion chamber. Then, I look up the shear strength of the screw I’ve chosen. I multiply this by the number of screws.

The total shear strength of the screws is sufficient to withstand the force acting on the bulkhead wall. However, when I consider the force acting on each hole in the aluminum tube and the wall thickness, I conclude that the hole will likely bend or expand.

What are your thoughts on this? Have you ever encountered this problem? How did you solve it?