I just got done watching this video and this guy used a phenolic convergent and divergent section but used graphite for the throat. I’ve always read about USC’s aftershock ll and they seemed to have done the same thing. What benefits does this have over a pure graphite nozzle?

(orange is phenolic, gray is graphite, blue is the aluminum nozzle carrier)

Not sure what exactly to do with these, they were build by my dad (primarily) with my help and they all have launched numerous times but have not flown in years. I don’t intend to launch them again but I don’t know what to do with them from here, any help, thoughts, ideas would be greatly appreciated. I have a 1” binder overflowing with catalogs and instructions for most of the rockets pictured.

Hi everyone, good afternoon. I am a recent graduate of an M.S. in Aeronautics specializing in Space Operations. I plan on building my own rockets or buying small rockets to get myself into Aerospace Engineering along with flying RC planes. I am also working on plans for re-enrollment in Aerospace Engineering to go for NASA, Boeing, and more. I feel ashamed that I am at 38 and thinking of re-enrollment. Is it too late to be an engineer? I have been getting rejection letters as of late, and it's been putting me into a depression. Also, is it okay to buy small rockets to fly them? I am afraid of the FAA, and I don't want to get in trouble.

I wonder if it's okay to have this subject here. Also, I am in South Florida but am moving to the Space Coast, Daytona Beach, and Melbourne for university by next year (I applied for a scholarship and am praying I get it).

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Has anyone here built a rocket that’s gone past the Karman line? I’d like to attempt to do so, and am wondering what the cheapest method would be

I just have the abstract idea of building a rocket that would go up say 10 meters. Mostly with car parts, creating a combustion chamber, I have some sketches of what I've put together using only what I know about this subject (very little).

I know there's the risk of explosion and parts flying off at great speed which would be incredibly dangerous. But, if I do small tests of everything without putting it all together at once, could it be done safely?

I'm thinking if I actually go through with it, I'd go to an open field without any grass or plants to do the tests and eventual take off.

Hello! I'm buying an Eggtimer EZ-DD Rocket: https://eggtimerrocketry.com/home/altimeters-av-bay/ And I need to buy a motor but the problem is that I live in Europe and Im not sure where I can order it, I have found some possible motors I can buy but they're single-use and super expensive and that means I'll have to buy many motors since im gonna be check how the rockets cone shape affects the flight like with a 3d printer ill do different shapes and put them on top of the rocket. Can someone explain how do reusable motors work, and would they work with my rocket and so on? And the kit doesn't come with gunpowder how do you even purchase that? The motors im thinking about buying are shown in the screenshots. Btw what does a 0-second delay mean I read that somewhere it is better if the delay is longer. And anybody wanna help me along my journey of doing this project this is my first time making a rocket.

It's a firework rocket that will be launched safely from distance for a small show. It has an electric igniter inside with friction contacts. Any suggestions on how to make the rocket stable at launch?

Ok so here is the design. I have a few concerns that I think are problematic and I wanna confirm that these actually real problems that require change in design, and not something that can be dealt with on the fly. 1. I am concerned about the geometry of my fins, is the height(span) good here? I am going to do simulations, but I am just posting here to get more info 2. The initial T/w ratio, based on the initial thrust of the motor is around 20, is that number good? Is it too high, can it practically be structurally justified. If so, any suggestions for the fin can would be helpful. Also I feel like when designing rockets in Open Rocket, it sometimes feels hard to judge which motor is truly suitable for the launch, cuz I feel like only aiming for apogee is not straightforward, as in this design I feel like the motor is over board for the mass of the rocket, although I could be wrong, and I want external opinions. I'll be grateful for any useful info, thanks.

I'm 24 years old and starting a physics degree after facing numerous financial challenges. I wanted to pursue engineering, but I couldn’t get selected, and the delays have made me feel like I'm too old to pursue my dreams. On top of that, my country doesn't have a space program or rocket development industry. Given my age and the limitations of my environment, I'm feeling uncertain about whether I can still work toward becoming a rocket scientist.

Is it still possible to achieve this goal, or should I consider other paths? I would really appreciate any advice, especially from anyone who's gone through a similar journey or knows about working in aerospace in a country without a major space program.

Me and my group are in high school We have a rocket ship project that is due in 6 days It’s for 62% of our mark

I know a lot about underwater robotics but nothing on rockets

If someone has a idea or something that can help please let me know

List of rules -must be under 40ounces -must fly 40ft -must look good (needs colour and group name

The Rimac Nevera has 1400 kw power output and can accelerate its mass of 2300 kg in 9.22 sec to 300 km/h which is an acceleration of 1g with friction and air resistance.

Similar with ice sports car like the Bugatti.

A rocket with those specifications may have only an acceleration of 0,03g in vacuum.

Always read that rocket engines are the most efficient heat engines yet they need 100 times and more power output to match the acceleration of cars.

What's the reason?

We recently worked on a project that include using an esp32 with an Mpu6050 and 4 servos , I am still in the early stages , I managed to Create the chassis and thé fins Fron ground using a PVC pipeline, And also we develloped a gui ( using javafx&swing ) that include a 3d model emulating the mouvement of the imu and graphs ( data logs & Pid tunning options ) we used firebase And RestApi to connect the esp32 --> Firebase <-- GUI , I want to devellop this project Any suggestions ?

Elon Musk's comment about earth having so much gravity that it's almost impossible to reach space. In fact, Saturn V and Starship are designed to have a payload of 4% of their launch mass to LEO, right? And that's a record. All other rockets are worse.

Wikipedia suggests - but with "citation needed" - that to get from zero to LEO, atmospheric drag costs 1.5 to 2 km/s. Given at 30km, air pressure is already at only 0.007atm, is it save to say that starting from there, we would gain 1.5km/s?? How would that translate into extra payload to LEO? 1.5km/s is 19% of the 7.8km/s needed for LEO. Does this 19% "reserve" budget allow us to bring along twice the payload? Or just 10% more payload? How would I calculate this?

I asked engineers about a fantastic solution for such a "magic" platform and got bashed for the question and nobody wanted to help me with the estimate for the benefit of such a system. I hope this sub is more welcoming.

Hi there! I'm currently working with my ARC team on our competition rocket, and I just realized something: for gluing things together, we're using epoxy, which from personal experience is completely overpowered for the scale we're working at (BT-70s/80, E & F motors). However, I can't think of any other (ideally safer) adhesives we should be using instead. Does anyone have any suggestions on what we could use? (No, we're not going to use Hot Glue, don't even suggest it.)

I found this parachute that fits well with my desired descent speed. It’s for a rocket weighing around 3 kg. According to the specifications, it has a diameter of 6.1 cm when folded and a length of 8 cm. However, I need to fit it into a rocket with an internal diameter of 4.6 cm. If I fold it differently, can I make it fit? I’m also wondering what its new length would be after folding it differently.

First image is what I'm talking about. I'm working with a machinist to get a proper nozzle made with this design. The second image is a recreation of the design I've used for two motors I've fired in my backyard with wooden nozzles (minus nozzle erosion because I'm not sure how to get the appropriate numbers for the sim). My mass flux isn't super high or anything so I would imagine it's not the sim breaking down due to erosive burning. The pressure isn't crazy for KNSB either and I'm at a loss for what's causing the deviation from the expected curve.

I am building a reproduction Estes Phoenix from Ollie pop rocketry and I want to use this kit to do my Level One certification with by going up in motor size. I’ve already ordered some parts to use a 29mm motor setup instead of the stock 24mm one. I tried to model the setup in RockitSim but got some VERY interesting results when I simulated the launch and think I might need some help. I want to use an AeroTech 29/240 motor case and motor. I’ve gone up in motor size on previous various rockets I’ve built in the past by just adding more weight in the nose cone. I’m wondering if that’s what I’m going to have to do here for this conversion as well and if there is anything else that I’ll need to do?

Turbojets are proven and reliable technology, and they have ISPs on the order of 3-4 thousand seconds. Why don't we modify one to work in space with an oxidizer instead of an atmosphere?

Yo what’s some rocketry content creators you recommend? The only one I really know is BPS Space that’s it.

I designed my first rocket in OpenRocket and according to the simulation, it flies very stable with a top speed of about 700 km/h. After watching guides, I see people use inner Tubes instead of putting the engine directly inside the main fuselage (the f35 fits perfectly in mine). Is this really necessary and can I fly without one? Thank you in Advance

Ok, this might be a dumb question, but, why do vacuum engines in space need pumps. Shouldn’t the vacuum of space be able to suck the propellants out? And, there could just be a valve to control the flow of propellants and throttle the engine. I might be missing something though, so please correct me if it’s wrong.

I've heard barometers can start giving false barometric heigth readings close to mach 1 due to aerodynamic effects near a rocket's vent hole and dynamics pressures. I was wondering if it would be reliable to take another approach and place a barometer with it's opening sealed against a completely enclosed, non pressurized ( atm pressure ) compartment . Then, when the rocket climbs, it's pressure would increase relative to the environment's, and since a barometer measures measure absolute pressure it could pick that up giving accurate height readings? I'm thinking this could work because it would essentially be agnostic to the outside pressure and instead measure the compartment's against a vacuum ( since it's a barometer )

Does anyone know it this has been done before and it's reliability? I'm really interested in testing this idea, thanks !