How can I find the thickness of bodytube of a rocket if I have the length,payload mass and also the outer diameter?

I’m in Highschool and this is my first year building a transonic rocket. Idk what we’re supposed to put inside our rocket and how. I’ve heard of a coupler and inner tube but idk where they go. We’re using the engine K240 and we’re with systems help

Do you know of a chemically based hypergolic rocket propellant source? What I mean is, it could be a program or a book that approaches it from a chemical perspective. Any source is important to me. I'm new to this and I'm a chemist.

Thank you for your time dear friends.

I live in Northern California and am wanting to shop in person for loc precision rockets

So first designing a PCB for use in a high G envronment. Most stuff I've made only experiences 1G :) I'm on a design team at my university and have begun on PCB design.

Normally I would just use JST-XH connectors but I was wondering what others have used and if anyone had some recommendations on which type of connector to use. If it helps will be experiencing up to 25G.

Screw Terminals, JST variation, Molex, other?

Hi I'm new to rocket building but I have experience using cad software and programming and am on a tight budget (im 16 and this is my dofe skill).

I have a raspberry pi zero 2 and was wondering if it would be a viable flight computer for stabilisation and radio control and if are there any flight software that already exists that I can use on the pi.

I also have a Bambu lab A1 3d printer and I wondered if there are any particular filaments I should use to print the frame.

Finally I'm on a tight budget so what would you guys recommend in terms of rc controllers and control servos.

Thank you for reading and if there was any advice you would give your younger self when building rockets feel free to put it in the comments.

Hi! I've just been accepted into one of my college's student project nuclii that focuses on building and flying rockets (primarily for the EuRoC competition). I've been tasked with making a spreadsheet or some type of similar calculation device that would allow us to calculate how much structural adhesive our rocket needs to survive max q, Mach 1, etc... I've already found a way to calculate the bending forces and shear forces it will suffer during flight, but I'm having trouble finding a way to convert those forces into actual amounts of structural adhesive. Does anyone know a way to do this, preferably without simulations?

What do y'all think Estes is gonna release in 2025? Here are my predictions: 1: 1:200 starship 2: 1:200 new Glenn 3: ksp rocket 4: new psii rocket 5: new designer signature rocket

Ok so me and my team have been planning to make a rocket that should have apogee of 2km. Based from our design we will most probably be using K class motors. And our team decided to use fiberglass since it is lightweight and the process of layering is not too hard, plus u can paint at the end for a custom look😁. So I wanted to ask u guys here which fiberglass types we should consider. There is the G12 fiberglass, but it is not available for us. Any other types that we can use, would be really helpful. Also if u guys would have any other suggestions it would ve nice.

Okay so, I'm a little confused on Q guidance. I can think of how it works for a ballistic missile, but I also understand that early orbital launchers used it as well. From what understand, with Q guidance you're just calculating velocity differences between you and the desired trajectory and this is done with the Q matrix, but for a launch or powered descent(on a vacuum body), how is Q guidance any different from an adherence to a preplanned trajectory? There's no way to calculate Vg if you're inserting into a circular orbit below the desired altitude, and if you're on a powered descent you have the issue of hitting the ground at high speed. Obviously this has to do with timing your descent burn and the descent orbit, but I still don't know how Vg is calculated. I mean, I can think of a way to do it, since the Q matrix varies with both time and position you can sort of use it to "sketch out" a bunch of trajectories to fly, but these wouldnt be ballistic trajectories as described in the papers i read and just sounds like a very advanced form of flying the line.

Heyo!
My dumbass, back again. Our group is looking to construct a 1010 rail system for conducting launch operations up to L2 kinda size, as it seems next to impossible to buy one in the UK. Looking for advice or starting points? The actual rail bit (using extruded aluminium) is easy it seems, but im looking mainly to see if people had any points of the base/stand section, and making the whole thing collapsible to fit in a car.

Merry christmas, and thanks in advance.

You may have seen my previous post of the Scout-1 that flew to what i believe was 1200 feet. That was a proof of concept and now with the knowledge gained I created the Scout-2. It has better stability around the coupling, more stable, and can fly much higher (around 1700 feet). And of course now it is painted :)

Hello Redditters,
I am a final year Mech Eng. student at one of the local universities here in Kenya. From an early age, I've had a huge interest in flight from an engineering perspective. With time I've refined this interest to rocketry, and specifically propulsion systems. My final-year project relates to the development of an M-class solid rocket motor. However, I also have developed an interest in Robotics, specifically dynamics and mechanics and control algorithms. I've worked on beginner robotics projects such as line-following and maze-solving robotics ( I know, very beginner stuff).

After school, I hope to be in either field but knowing my geography and my grades (pretty average) I think it would be next to impossible, hope is not lost though. I've decided I'll take whatever job I can find to sustain myself but work on my hobbies in my spare time. As much as I'd like to be a jack of all trades, I want to specialize in a specific field and I have chosen rocketry. I want to go beyond the amateur stuff. Design and possibly build fully functional rocket engines (liquid, hybrid, and/or solid). I know a few great resources I could use: books, and sites like MIT OCW.

My question is, what knowledge (both theoretical and practical) do I need to gain an advanced understanding of rocket propulsion and how can I gain it? Currently, as a MechE student, I have a sense of fundamental engineering and math knowledge as well as some basic manufacturing skills. I've also specialized in thermo-fluids with courses in wind tunnels, CFD, turbomachinery, etc.
Also, could I integrate a bit of robotics into rocketry? At a minimum, control systems, but if possible, dynamics and mechanics.

TLDR: I'm a MechE student looking for knowledge and resources (self-study) on advanced rocketry at least that would be admissible in a rocketry company or post-grad opportunity in the same field. Also looking for ways of integrating robotics (Control systems and dynamics and mechanics)

I want to launch a rocket and thought this was a good place to ask. I want any advice on building, igniting, and flying/launching a rocket.

Thanks!

Hi everyone,
I'm currently working with a team to create a custom flight controller but I'm struggling finding a solution for the current height of the rocket. I want to have a GPS with 180km+ range so practically an unlimited range GPS module. An example of the kind of system I'm looking for is the Kate-3 GPS system however it's over $4000 and the features on it are redundant, for example i already have a one-way telemetry system that can handle the range so I wont need the built in antenna I'm really just looking for a bare GPS module.
Thank you in advance any help is appreciated.

Edit: Some recommendations for parts to build my own would also be great I would just need to get past the COCOM limits which limits commercial chips to 18km which I'm not sure what chips do that.

My rocketry team calls the experimental process of determining Cd a “waterflow” were you flow water through the injector into a bucket, weigh the bucket, time the flow, and read off a pressure gauge just upstream to then calculate the Cd. Is there a more official name for this process? It doesn’t seem like it’s commonly referred to as a “waterflow”

First of all , i know the physics behind it and propelant stuff , but what tips should I know Fuel mixture? Aerodynamics? Body shape? Size? Parachute?

https://youtu.be/zHuO7b8EIMI?si=LTKqOdtd-mmnnEMl

Or were model rockets (and related supplies) sold at Walmart in the 90s? I mentioned this to a friend and he thought I was crazy, but my brother and I had a summer that we got into rocketry and I could have sworn that we got our stuff from a regular Walmart.

Hi everyone,

I am an experienced aerospace engineering with plenty of experience in fixed wing design.

Now i am planning on broadning my skill set to rockets.

Are there any books for gliding free-fall rockets. About the design and GNAV.

https://preview.redd.it/1t9ugsq58h5e1.png?width=1111&format=png&auto=webp&s=b1d4e2f42fd448c5b55130d7f34740f872aca256

Tally ho,

I've been designing engines for a few years now and I'm in the process of actually fabricating one. I've chosen to use an ablative nozzle as it will be easier to manufacture (at least, thats what I thought at first glance) than a regeneratively cooled nozzle.

However this was before I did any research on how some of them are actually made. I haven't been able to find an efficient way of fabricating something of these dimensions.

The thickness, length, etc. can be easily changed if I needed it to depending on the burn rate, etc

Preferred method of fabrication would be pouring it into a mold and letting it cure at its final dimensions, if not some prep work after its released. I have access to high-grade machinery (5 axis mills being one) and am up to making it the hard way if I have to

I've looked into phenolic resins but I can't buy a chunk large enough to turn down, and cant find any information on pour casting (albeit a little on composite work) but I've never worked or done nearly enough research on the subject. Unfortunately, theres so little I can find that means anything to a rocket nozzle I've only found papers regarding general use in the world (countertops, microscopes etc. that would not ablate satisfactorily)

I can convert the cooling to be regenerative if it can be deemed unnecessary to ablate it too. The design is still early so everything is flexible

TL:DR need information for ablatives that can be economically used & fabricated for the nozzle shape.

Hey guys We are developing a hybrid rocket motor and we’re encountering an issue during static firing tests where our thermocouple is not providing accurate measurements on a cylindrical surface. What can we do to measure more accurate temperature datas?

Hello rocketry experts, I have been watching a few yotube channels about model rocketry for a long time now, and I'd really like to get into the hobby. I finally gathered the courage to write a post on this forum asking for ressources/help getting started.

I think it might be worthwhile giving a better description of myself : I'm graduating high school next year but I've finished the entirety of the physics and chemestry programs, I program a lot (C mostly) and really enjoy chemestry, physics, electronics, woodworking and electronics. I have a bit of experience playing around(more or less safely) with oxyhydrogen (I know this is way to dangerous for model rocketry), I'm also very young so I don't have the ressources that an adult would have, but my parents trust me and will follow me in that kind of endeavours.

I don't know how useful all this info is but it might be but anyways, thanks in advance for your answers

Btw I'm not a native english speaker sry for the mistakes I just noticed I wrote in instead of into

EDIT : Does everybody here use solid motors ?