r/rocketry

Hello all!

I have been hard at work constructing the instrument bay for my L1/L2 Cert rocket, and I am about ready to integrate my eggtimer WiFi Switch. My only question is, can I use it to do dual deployment by itself? Or is running something like the eggtimer Quark necessary to do dual deployment, and the wifi switch is used in tandem with it for convenience?

I can’t seem to find any information on it in my research aside from Google AI telling me it’s fine with seemingly no source for this claim (which I’ll take with a mountain-sized grain of salt), but I can’t seem to find any information telling me it isn’t fine to run it by itself either.

I would love to have y’all’s feedback, and if there are any helpful links or videos you guys know of that would aid me through using eggtimer products like the wifi switch or the quark, feel free to share with me. I will be posting follow up pictures soon of how the avionics bay turns out (assuming all goes well cutting out the camera window), so let me know how interested y’all are in the building process! This is far from the last question I have regarding the design of my rocket, hahaha.

Hey all,

I'm part of a rocketry team and we've recently had a few successful launches of some smaller rockets (roughly 16" long by 2" wide), getting to about 200 feet. Now these rockets have gone absolutely fine (aside from one centering ring and shock cord separation), but we're planning on building some bigger and heavier power rockets.

My question is, how do you guys go about doing full structural and drag analyses to make sure your rockets don't snap and or separate mid flight? We've been using OpenRocket and some FEA on Soldiworks, but I'm curious about your opinions

Hey all, I have been meaning to get my L1 rocketry certification (through Tripoli or NAR, not sure which one yet) for a bit now, but I really do not know where to start. I have some experience with liquid and large solid engines through internships, classes, and clubs; however, I don’t have too much knowledge on stuff like structures, aero, or much else.

What are some good textbooks on rocket aero, structures, and maybe control systems to get me started with this?

One of the members for our clubs L1 rocket team launched his personal rocket L1 cert on an H115 and it completely blew up midair. The motor catoed and blew the body tube in half and ripped the shock cord mount on the nose cone.

How common are motor catos for commercial bought motors? And is there anything he could’ve possibly messed up on a DMS motor that caused a cato?

Hello, we are developing our first 1km rocket and due to time and budget constraints, we are using the same diameter of our 500m rocket. That resulted in a very long and slender rocket, with an L/D of 144/7.8 cm, and we have some questions about the static margin that we should be considering.

We don't know if our rocket will suffer from weathercocking with a static margin higher than normal and what is a good way to solve that problem. Is it better to add mass to the nose cone or make bigger fins? Is there a rule of thumb for that kind of rockets?

Any help is welcome, thank you guys in advance.

https://preview.redd.it/p8ppbbcw9ewg1.png?width=842&format=png&auto=webp&s=de7d75a03a3c435f92cf4d042348c5da05bd5054

Has anyone ever 3d printed a coupler, I’m running into an issue with having room aft of my eBay for my drougue chute and am considering cutting the body tube a few inches above the motor mount and taking some length from my section forward of the eBay where I have plenty of room and moving it back, I could just get a 6” coupler from loc but why pay $20 shipping on a $5 part if I can 3d print it and achieve the same goal, weight would be my only issue; well not weight but more weight in the aft section where I don’t want it however it would also move the eBay which is heavy further forward potential helping my cg

Hey guys, im new in this world, and im doing a 1-stage hydrorocket (on a 1.35L coke bottle) and I´ve done some research but I am still not sure how much should my telemtry system should weight, now (hardware and the 3d supports is about 135grams)

here is everything ive done https://github.com/DonJechu/HydroRocket-Telemetry-System/ (using a Lipo 3.7volts, hardware works perfectly)

Hej! Har varit intresserad att börja bygga raketer, bor I sverige. Förstår att styrpinne kräver speciellt tillstånd för fyrverkerier men gäller samma sak för hobby raket uppskjutning?

If posting this is against the rules, please direct me to where I can post this.

Hi y'all, I'm a part of the Spring Grove rocket team from Pennsylvania, and I'd like to share all of the rockets my team and I have made.

These 2 rockets are the first rockets my team and I have made. We made these back in 2022, our 8th-grade year, for The American Rocketry Challenge (TARC).

This is my level 1 rocket. It is a LOC IV kit that I made in 2022, and I used it to get my level 1 in 2023.

This is my team's deployable payload rocket that we made for the Battle of the Rockets (BOTR) freshman year. It's a BT80 cardboard rocket that deploys the payload inside a capsule at apogee. The payload relayed telemetry from a ground station to our laptop.

This is my team's first fiberglass rocket, built for NYPower 2023. It is 6' long and BT80. It flew on a J410 up to 5,281'.

Here I am holding our NASA Student Launch (SLI) subscale rocket. It is scaled down 25% from our official SLI rocket. It also flew on a J410.

This is our full-scale SLI rocket. It is a 12-foot-tall, 28-pound, 4\" diameter rocket that flew on a K820 down in Alabama. This rocket went 4,000 feet. It is called Papa T.A.T.E and carries its payload, T.A.T.E (Temperature Across Time Experiment). The objective of T.A.T.E was to see how paint color affected the internal temperature of the rocket. We did SLI in our sophomore year.

This is our rocket called Brutus that competed in the Mars Rover event in BOTR a week ago. It is 6\" in diameter, 11' long, and weighs 45 pounds. It flew on a K1200 to 1200'. This is our final rocket we will build in high school.

Unfortunately, Brutus had a motor failure on its second flight, and we lost the back half. We are currently rebuilding the back half and would like to launch Brutus on an even more powerful motor at NYPower in May.

Thanks for reading this and learning about all of my rockets. I'll post links to my team's website and Facebook if y'all would like to learn more:

https://springgroverocketry.weebly.com/

https://www.facebook.com/p/Spring-Grove-High-School-Rocket-Scientists-100057840431938/