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We are looking for folks with HPR expertise to be judges for the upcoming Spaceport America Cup. This year’s SA Cup will be held at the Las Cruces Convention Center on 20-21 June and at Spaceport America, NM on 22-25 June 2022. We are expecting over 1,500 student rocketry team members...

I‘m thinking about performing Monte Carlo analysis using OpenRocket. I saw the piece in the NAR Safety Officer training book about requiring Monte Carlo analysis when altitude predictions are greater than 90% of the waiver, with the idea that varying launch conditions and the variation in...

It's the "true" story of the development of the Corporal missile. Made by JPL. This will make you feel better about launch hiccups, unstable flights, and land sharks. "Dedicated to the valiant Army brass, without whose help so much could have been done."

Saw an interesting wrinkle from one of the teams at IREC/Spaceport America Cup. Where they were from BP was unobtainable under any circumstances. CO2 systems were also not doable for them. Their answer was to use airbag inflators, which they could obtain easily. These are the expended...

Finally got some downtime between projects and have installed a new Micro Swiss all-metal hotend for my Ender 3 Pro. (also switched to Capricorn tubing) The install was pretty straightforward, and I followed the video instructions on the Micro Swiss website. I had to adjust the z-stop slightly...

Launched my 4” fiberglass DX3 XL today on an M1350W. Flawless launch and recovery. 50’ Rocketman extreme streamer for the drogue, 9’ Iris parachute for main. Full-color wrap of my own design, done by Mark at Stickershock23. Custom recovery harnesses by Mike at MAC Performance. Thanks to...

I was going to buy some new Hatchbox PLA and see that Amazon was out of most of the colors (including the two I was looking for, of course). The Hatchbox site also shows much of their stuff as unavailable. I'm not sure what the issue is here, or if this is a long-term thing. Does anyone...

Inspired by https://www.rocketryforum.com/threads/av-sled-first-printing-project-feedback-appreciated.151171/, I thought I would make a "plain" X-shaped avionics sled. No customization here, just a blank canvas for all your electronics and batteries. Sized for both 3" and 4" bays. These...

Hi, I just got some RocketPoxy in the mail yesterday, and I noticed that the expiration date is August of 2018. I’m taking this up with the dealer, but is the expiration a “hard” limit or is it still good after that? I had five out of the six internal fillets for my L3 build complete, and...

Hi all, Just got my USB IO dongle in the mail today and tried to hook it up. [There is a solution at the bottom. If you don’t care how I got there, skip to the TL;DR] Installed the software, drivers loaded. Hooked everything up, tried to connect, no joy. Went through all the variations of...

Hi Everyone, Interesting piece from IEEE Spectrum -- FYI - Bill spectrum.ieee.org This 3D Printing Technique Is 100 Times Faster Than Standard 3D Printers 23 Jan 2019 | 21:38 GMT 6-7 minutes A new 3D-printing technique could render a three-dimensional object in minutes instead of hours—at up...

All the parts for this design came today. Mike at MAC Performance made this into a kit for me. I had heard great things about MAC Performance kits, but getting the real thing was quite impressive. All parts fit with very tight tolerances. I’ve heard the joke about flying it without gluing...

Hi All, I’m planning my L3. I have a 4” fiberglass MadCow DX3 XL, and planning on using an M1350 motor. However, this combo busts the altitude waiver, bottom line is that I need a planned apogee at about 11,000 AGL. Thought first about adding weight, but need close to 4 KG extra which creates...

Hi All, As I’m working through my L3 planning, I’m also scratch-building a 3” DD rocket with a 38mm motor tube that will be a “frequent flyer” for everything from G-J. I’m trying to make it light enough to fly under a Class 1 waiver with a G or small H, but robust enough to handle high...

Hi all, I'm working up for my L3, which is going to be a fiberglass Madcow DX3 XL (black Friday special), with (tentatively) an M1350 motor. Going with the KISS principle, I'm planning to do it "stock" with the addition of a thrust plate. My problem is keeping the thing within our altitude...