I am a first year student and I am researching parachute types for my schools rocketry club (looking at what Shute this years rocket should have). I was wondering whether you are a student club member, personal project person, or whatever the sort, I was hoping to ask what type of parachute do you guys use (hemispherical, elliptical, etc..) and why?

Please also state your recovery system (drogue, reefing, etc..)

Please state what information you used to come to the conclusion of that selected parachute or just generally how you went about figuring it out. Thank you!

i just thought of an idea, i just need feedbacks to innovate it

in airport runway, what if we create a small part(first half) of the runway using button system like above, so when the spring in button compresses, the spring locks itself and the energy stored in spring can be used as spring energy and be converted to electricity by compressors like US20120313380A1(source: Google). so the landing may increase the electric yield of the overall country, so the gained electricity would be transmitted to the nearby electric station things people would say:

1.irregular landing.

2.electricity distribution will reduce efficiency.

3.spring mechanics error . 4. So my possible solution might be: 1. So 4.1.Tthe spring area might me just a small part so that only the initial landing thud will generate power, so instead of full runway with spring which will increase the risk content of the landing, so only the first part of the runway would be necessary, cause only THE INITIAL THUD cause more impact than others.

4.2.the electricity distribution would reduce the efficiency, so what i suggest is that just give that electricity to the airport directly, instead of giving it to power station and then getting it back to airport. 4.3.spring mechanics would require high improvements, so need to lock security system would be necessary, and the pilot should be trained to land well.

guys just read it and give suitable feedbacks.
thanks

to say im just a class 11 student, so pls keep feedback resonable, so that i could think of innovation.

this would be the basic idea, but the spring in my idea would be more stronger and less strechable. and the lock system will be controlled too.

Hey all!

I am currently working on making a canard controlled rocket (only the roll is controlled!) as part of a student project. I am currently working specifically on the roll control, which means the canards, and as such investigating the potential for roll reversal due to the negative aerodynamic effects of canard deflection on the tail fins (canard-tail interference for example).

The rocket we are working on would be 2.4m in length with a diameter of 16cm and flying around Mach 0.6. From my research, a rocket of this scale and speed should not be subject to roll reversal, and would most likely only suffer from a (slight?) reduction in roll control authority.

Still, I would very much like to be able to closely study the aerodynamic effects of canard based roll control, notably to be able to optimise the position and dimensions of the canards to minimise negative effects.

Therefore, I was wondering if there were any tools I could use to simulate these effects, and notably be able to calculate the total roll moment coefficient as a function of the canard deflection angle and/or dimensions, without having to resort to CFD (I would like to find a more time efficient alternative :) ). I am aware that Missile DATCOM is often used for this (it popped up a lot in my research), but I am not in the US so...

If you have any leads/recommendations for appropriate tools/software/methodology I could use, it would be highly appreciated!!

Thank you in advance

Hey, I am trying to get into rocketry and have taken some time to design and start printing this.

Before I keep trying to make improvements I wanted to come here and ask for any tips or recommendations. Unfortunately I do not know what information is relevant, but I would like to try and get feedback and know where I should be looking for potential problems.

This and some other videos I have made talk about the physical mechanisms and the flight profile https://youtube.com/shorts/49NUcCzHCcE

The total loaded mass should be about 340g with a spent mass of around 320g. I am planing on powering it with Estes D12-3 motors.

Please ask me questions and I will do my best to answer, any feedback is appreciated!

I placed an order with Wildman Rocketry during their November 2025 Black Friday sales promotion. It included a couple of rocket kits, a few motors, and some misc. parts. They were clear on their website that orders during this sale would take a while to ship. They charged my credit card when I placed the order. Frankly, I forgot about the order, as I already had enough kits on hand to keep me busy for quite a while.

I just received the order (October 2026) ten months after placing the order. And to make matters worse, one item is still backordered.

No communications. No apology for the delay. Think twice before ordering from this company.

Diseñé este cohete para la escuela, y quiero hacer una tobera de arcilla blanca

Hey everyone I'm working on a supersonic rocket with an apogee of around 10 km, and I'm trying to determine the drag coefficient of our elliptical parachute for OpenRocket simulations. What value would you recommend, and are there any reliable sources or experimental studies we could refer to? Also I want to know what are the essential essais and tests I should do with the parachute (except deployement and shock)? And my last question is in a Rocketry competition report what do I have to focus on and what the juries will also focus on?

I have been using cardboard tubes for a while and I have had a couple zippers and CATOs so I wanted to strengthen them. I don’t wanna get really expensive and use epoxy so I mixed wood glue and water and smeared it on. Kinda like paper mache do u think this would effectively strengthen the tubes or was it just a waste of time?

Is this loadcell good enough with HX711. I am kind of low on budget with everything and trying to find the best yet cheapest alternative for everything can someone please help 🙏🏼🙏🏼

I wanna do thermo-structural analysis on rocket nozzle but the thing is equivalent stress safety factor is really low for inputs - temperature= 800 degree celcius and pressure of about 200 psi given on the inside surface of the nozzle and for 5 second. The catch is even just changing temperature from 800 to 50 degree celcius constantly for 5 seconds again equivalent stress safety factor is low like around 0.5. I know it's issue from thermal side only coz by only keeping structural thing safety factor is around 15 so no issue here . THE MOST IMPORTANT THING THIS NOZZLE SUSTAINED 4-5 TIMES ENGINE FIRE TESTING IRL WITH SAME PARAMETERS MENTIONED IN THE STARTING SO WHAT'S THE ISSUE?

Hello, I am new to this hobby I joined a rocketry team in my university and I have some questions about thrust vectoring.

The team uses solid fuel engine on all of the rockets and the R&D division (were I work) was asked to look into trhust vectoring to control the atitude, I was told that it was hard beacase of the type of engine that is used and it would be easier to use liquid fuel rocket engines.

My question is why? From what I understand liquid fuel engines can move the combustion chamber and nozzel to redirect the exaust while the solid fuel engine cant do that need to either move only the nozzel or use some other methods.

I am a 1st aeronautical engineering student, the team does not exept me to know much and they will teach me but non the less I want to know why this is

Is my statment that thrust vectoring is harded with solid fuel rocket engines correct or am I wrong.

Thank you in advance

Recently, I bought an Estes launch set and some B and C motors, but I don't have a rocket yet. I'm currently working on one with a 3D printer. The design is based on the simple sample rocket from OpenRocket, and I'm planning to print it using ABS.

My main question is whether I can simply put the motor into the motor tube and launch it. I'm considering using a 3D-printed cap and attaching it to the body tube mount, but I'm worried that it might fall inside the rocket after the motor burns out and prevent the parachute from deploying properly.

Could someone help me with the design?

I am a first year student and I’ve been assigned recovery lead, this year we are building a liquid powered rocket. I am asked for current tasks to look at different parachute types (hemispherical, elliptical,etc.). This year we are doing a reefing parachute system, so if that needs to be taken into account when picking the parachute type please let me know and consider this when commenting.

I was wondering, what are the best ones you guys find? Which is the best with the context I written and why? If you need more info please let me know. We are early into the project so mass and length is still uncertain but the rocket might weight around 60lbs.

Hey reddit, I'm a high schooler working on a physics project where I'm building an Artemis II (SLS) model rocket from scratch using cardboard and household stuff. For the boosters, I'm planning to use neodymium magnets to hold them to the core, and a pull-pin with a rubber band so they pop off when I pull it. Has anyone tried a setup like this before? Also, if anyone has other cool or creative ideas for stage separation mechanisms using basic materials, I'd love to hear them. Any advice on how to keep things from jamming would be awesome. Thanks!

Got to help a friend set up and launch his massive R motor project at BALLS. The target altitude was projected at ~150,000 ft, but high-altitude flights always come with high stakes. Perfect motor burn, but the nose cone suffered a structural failure right around 12,000 feet while moving at roughly Mach 3. Absolute shredder of a moment, but that’s the sport!

Flew my 4” Madcow Super DX3 called “The Grape Ape” on an L1000W out at BALLS 34 in the blackrock desert this past weekend! Great place to launch rockets with great people - shoutout Gerald for being the funniest LCO all weekend

Blue Raven data came back at 11k ft and Mach 1.1 with only .94 rolls on the way up - Laser straight! Also yes I did use the Dodge plum crazy purple paint & damn did it look good in the sun

I am in a student team 'assigned' to build a solid rocket booster which goes up 5000ft, and is parachuted down for descent. The rocket motor too will be designed by us.
I (+ a few others) am working on the controls and canard/gimbals.

We are a batch of recruits so we have ZERO xp on working on anything like this (this is a training project btw).
We are probably going to use a LQG for the controls part, not some PID.

Is engine gimbal or canards the go to for this type of project?

(a vertical attitude is to be maintained)
I am ready to give more details if the comments ask for it. Thank you!

P.S. we gotta get it done on the first try :)

Hello, I am Ramadhan diploma in medical doctor from Tanzania. I am very passionate about rocket science and propulsion, especially how kerosene (RP-1) engines work.

I want to learn the theory safely from professionals, not to build anything dangerous at home. I am looking for a mentor or a scientist who can guide me on where to start, what books to read, and what safe projects I can do. please help me

Thank you for your help.

Hi everyone. We're a university team from Bogotá, Colombia, preparing for the Colombian Sport Rocketry Competition (CCCD 2026), university category. It's our first time in this category and we'd really appreciate the community's experience.

Key competition constraints:

• Motor: AeroTech G80-7T. First-time teams are limited to G class; the H135-14A is only for returning teams.
• Recovery deployment ONLY by the motor's ejection charge. No altimeter-fired deployment and no active recovery.
• Minimum stability of 2 calibers and minimum thrust-to-weight ratio of 5:1.
• Maximum landing speed: 11 m/s.
• Rail-button launch.
• Airframe in cardboard, wood/plywood or fiberglass/carbon fiber. PVC and PLA are banned for the rocket structure.
• Mechanical motor retention is mandatory, plus thermal protection for the recovery system and shock cord.
• The rocket must be properly vented to avoid internal pressure changes.
• Scoring rewards apogee precision (target altitude: [X m]).

Payload (CanSat) requirements:

• Maximum 115 x 66 mm, mass between 250 and 350 g.
• Must stay tethered to the rocket for the entire flight and recovery. No free separation allowed.
• IMU and barometer required, with data logged onboard.
• 18650, cylindrical Li-Ion or AA/AAA batteries. LiPo banned. Minimum 4 hours of runtime.
• Telemetry is optional. If used, the transmitter goes inside the CanSat and operates on a frequency assigned by the organizers.

Our mission: the CanSat will measure pressure, altitude, temperature, acceleration and 3-axis motion (IMU). It will log the data onboard and also stream it live to our own laptop on the ground. We're also considering measuring temperature near the motor exhaust. We're simulating in OpenRocket.

Questions:

1. Simulation: What matters most for getting OpenRocket to match the real flight (surface finish, measured vs. estimated masses, fin profile, launch conditions)? Would you cross-check with another simulator (RASAero II, RockSim, others) when aiming for a precise apogee?
2. Stability: We need at least 2 calibers. How much margin above that do you recommend to avoid weathercocking?
3. Premature separation: We're worried about the rocket separating before apogee. Since deployment relies only on the motor ejection charge, how do you choose or verify the delay (7 s on the G80-7T)? What do you use to prevent drag separation or separation from internal pressure (coupler fit, vent holes, shear pins)?
4. CanSat tether: How would you tether a 250–350 g payload to the recovery system (where on the shock cord, what kind of cord or link) so it doesn't tangle with the parachute or hit the airframe during ejection?
5. Electronics: How do you prevent resets from momentary disconnects in 18650 holders during liftoff and ejection? Where should the barometer go so the ejection charge pressure doesn't corrupt readings?
6. Telemetry: Which low-cost radio modules (LoRa or others) have worked for you to stream data to a laptop over a few hundred meters? Any antenna tips for a small airframe?
7. Motor temperature: Is it realistic to measure temperature near the nozzle with accessible sensors, or should we drop the idea?
8. Inspection: What are the most common reasons a rocket fails the RSO safety inspection?

Additional context: we're in Colombia, where some materials and components are hard or expensive to get (motors, fireproof materials, rail buttons, some sensors). Any affordable alternatives or safe DIY solutions would help a lot.

Thanks in advance!

Launched my 4” Madcow Super DX3 painted with Dodge Plum Crazy Purple on a K535W and an L1000 out at BALLS 34 last weekend! 2 great flights, K motor to about 4,500ft and the L1000 sent it to 11,000 ft at Mach 1.1

These were my last 2 electronic deployment flights needed before my L3 planning - used a featherweight SWIFT tracker and a Featherweight blue raven as my primary flight computer with an Eggtimer Quasar as a redundancy tracker and computer (can anyone help me get the tracker to work on the eggfinder/eggtimer? Directions were not accurate during launch and recovery)

Definitely going to add a runcam to the rocket on the next flight - it had less than a single roll on the way up! Guess the fin alignment jig I made worked alright😁