Copenhagen Suborbitals
@CopSub
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Copenhagen Suborbitals is a crowdfunded non-profit suborbital human space program, crewed only by volunteers working towards human spaceflight in our sparetime.
Copenhagen, Denmark
Joined April 2013
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Meet Rescue Randy: Pilot, Test Department. Boasts two rocket flights!
He will be the first passenger of our crewed SPICA rocket, gaining the official title of dummy astronaut.
Visit to help Randy fly your name to space and get his astronaut wings!👨🚀
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Remember:⠀
It’s not the size of your rocket that matters, but the will to succeed.⠀
⠀
Happy new year, from all of us! 🚀
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The 1st test of our 3D printed stainless steel coaxial swirl injector! 🚀
In 10 minutes we will run one more final test with this injector, performing a long duration burn to celebrate and finish off this successful 2-day engine test campaign. Join us!
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Meet Rescue Randy: Pilot, Test Department. Boasts two rocket flights!
He will be the first passenger of our crewed SPICA rocket, gaining the official title of dummy astronaut.
Visit to help Randy fly your name to space and get his astronaut wings! 👨🚀
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Who would have thought a stuck valve would scrub a giant, perhaps most anticipated rocket launch! 🤔
In case you want to learn why those cryogenic valves can be so devious, we have a video explaining it.
Link below.
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In 2014, we injected a
@GoPro
camera into a rocket engine exhaust. 🚀
It didn't go too well for the GoPro, but we made a short video about it in case you don't know the story.
Bonus: with some electronics magic we recovered the footage. 🔥
The video is linked in the comments.
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NEW VIDEO - NEW ROCKET ENGINE REVEAL! 🚀
After countless battles with trying to take BPM-100 into production, it's a pleasure to finally bring you the BIGGEST Spica rocket engine update we've done in years!
P.S. The engine is not what you think! 😯
Video link below. 👇
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You probably know Scott Manley and Joe Barnard. Both featured us in their latest videos yesterday. There's a lot to learn there, so take a look!
@DJSnM
on Rocket Fuel Injectors:
@joebarnard
on Thrust Vector Control:
Thanks both!
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This day in 2012 we tested Launch Escape and parachute systems for the Tycho Deep Space Capsule. Our mannequin astronaut Rescue Randy would tell you all about the flight, sadly he doesn't speak.
Visit to read on it or support our crowdfunded space program
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NEW VIDEO - a new rocket is being born in our rocketshop! It's been 6 months since its design kick-off & it's already taking shape!
It's built by our new recruits - fresh engineers & passionate high school students who want to gain hands-on 🚀experience.
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We are starting to look at producing our space capsule nosecone. From left to right you can see how we transitioned from a 1,8m tall separating fairing design to a 0,8m tall deployable nosecone that minimizes debris, and simplifies manufacturing and its separation sequence.
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First test with the new injector design is complete. Fantastic sound, and the engine is still looking great!
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B-roll of our latest video ( ) included a BPM-5 engine that tested different fuel mixtures - 75% ethanol to 92.5% (w/ & w/o 1% TEOS). Here's the exhaust color of the different mixes. Should Spica fly Red or Blue?🚀
Old TEOS blog:
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The first Spica 304L rocket propellant tank passed its pressure test exceeding 30bar!
On first try!
With no leaks!
As a result it got deformation hardened and bloated in circumference by 145mm.
This makes us REALLY happy about our DIY robotic propellant tank welding machines!🚀
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A first one for the history books! Our HAB (Horizontal Assembly Building) has finally been turned into a VAB.
So no, we didn't shrink John and Scott, just simply stacked the the two LOX & Ethanol propellant tanks. Nice to see Spica beginning to look like an actual rocket! 😍🚀
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Our static fire tests this weekend will compare not only 6 different injector designs, but also different alloys & manufacturing technologies. 4 injectors are made in brass and we thank Anton Häring for their help machining the swirlers!
For more watch:
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Here's the rig we use for BPM-100 rocket engine LOX valve cold flow testing (minus its valve motor and gearbox).
A critical component in any liquid 🚀 engine to precisely control flow of propellant (in this case cryogenics) under extreme pressures and low temperatures (-183°C).
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The world's most powerful electric rocket propellant pump's LOX side came to our rocketshop from
@OrbitalMachines
for testing before powering our Spica rocket's 100kN engine!
Not as mass-optimized as their commercial smallsat launcher pumps, it's still an un-matched power house!
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Many of us have trouble gaging the scale of rockets & their components. Since we've downscaled Spica's BPM-100 rocket engine to a cluster of BPM-25's you might wonder how big are they?
That's where the only universal aerospace measurement unit saves the day.
#BananaForScale
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On this day in 2018 we successfully launched & safely recovered our Nexø II rocket, proving:
🚀Bi-liquid rocket launch from sea
📺Live video streaming from a rocket
🪂Successful chute deployments
📌Accurate splashdown location predictions & more!
Full mission recap on YouTube.
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Our first 3D printed coaxial swirl injector in final preparation before it's soldered altogether!🔥
Such a critical moment - it's taken tons of work & effort, yet it's the first time we take this final step to coaxial injector completion. 39 fingers 🤞!
Thanks to
@DigitalMetal3D
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That orange colour does stand out.
Although only a few crewed capsules are currently operational, there is a good amount of crewed capsules in development to launch people to space. Here is an overview to compare them.
If you like our work don't forget to donate
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From single injector element manufacturing, iteration, water flow testing, data analysis and single element grouping, we went to full injector manifold soldering and now mass flow testing. We are looking forward to start our engine test campaign as soon as the world opens! 🚀
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Ok, we confess. With all the new machinery we built for the Spica rocket production and all the Spica hardware and support equipment showing up, we might be running short on workshop floor space. So we made a wall rack for our smaller flight-proven Nexø I and Nexø II rockets! 🚀
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A new look into how the electric propellant pump from our friends
@OrbitalMachines
(a Norwegian CopSub spin-off) will integrate with the Spica rocket and our BPM-100 engine. Electric pumps on a 100kN scale are so far unseen in the rocket world, so this will be interesting! 🚀
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Remember:⠀
It’s not the size of your rocket that matters, but the will to succeed.⠀
⠀
Happy new year, from all of us! 🚀
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WE DID IT! We made our first coaxial swirl injectors for the BPM5 rocket engine! There's still a few variants to go, not to mention leak & water-flow testing, but we can wipe off some sweat now. Things are looking positive and we're aiming for lots of engine tests around Xmas! 🚀
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@joebarnard
Congratulations, Joe! It's been great watching you stick with it. And here's to sticking it twice! 🚀🚀
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Our big inspiration, Alan Shepard, performed the world's first crewed suborbital spaceflight today 60 years ago. He rose to space in a Freedom 7 space capsule on top of a Mercury-Redstone rocket, a mission with many similarities to Spica. We thank him for lighting our candles! 🚀
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@RocketLab
But
@RocketLab
, you've surely uploaded the wrong picture, as there is no banana for scale??
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🚀 NEW VIDEO - Finally plunging our 1st FULL coaxial swirl injector in the vacuum oven was a big milestone in Spica's development! Did we mention it was scary?!
And we upgraded our flow-mapping set up to help us more easily prevent engine-rich exhaust:
📺
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To make our astronaut re-usable, we need parachutes - BIG parachutes.
Here's an 11 meter prototype parachute (ring sail) which will use almost 500 meters of suspension line, when done.
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On this day in 2018, we launched our Nexø II rocket. Re-live the moment with us from the rocket's perspective as it lights it's engine, leaves its launch rail and climbs above the clouds to deploy its parachutes and gently land in the Baltic Sea again.
Music by
@Erdayastronaut
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A 30bar pressure test (📺 ) can make your propellant tanks buff, but 144 rivet nuts in thick 304L stainless steel will make you even buffer!
These 144 nuts will connect our LOX and ethanol tanks to the intertank section, completing 1/3 of Spica rocket! 🚀
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The 304L Spica rocket propellant tanks are coming together! We carefully took our time, as mistakes would be expensive, and successfully welded the first bottom bulkhead onto the cylindrical section of this ethanol or LOX tank. On to the next one!
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NEW VIDEO - Spica rocket engine LOX valve!🚀
Cryogenic propellant valves are either challenging, very expensive or both. Click the link to watch us go into the design details and first dry tests of the flood gates for our upcoming BPM-100 rocket engine!
📺
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Congratulations to SpaceX for getting this far with their Starship suborbital flight.
Photo: screen capture from SpaceX stream.
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Remember:⠀
It’s not the size of your rocket that matters, but the will to succeed.⠀
⠀
Happy new year, from all of us! 🚀
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Remember guys:
It’s not the size of your rocket that matters, but the will to succeed.
Happy new year, from all of us 🚀
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Due to low ethanol/H2O fuel combustion temps and production difficulties we're facing with a conical, regen cooled nozzle in a BPM100 size engine, we're trying a different nozzle design. Is it the 1st Aerospike Propelled Rocket Intended to Launch by a crowdfunded organization?
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Congratulations team Virgin Galactic and Unity 22 passengers on a beautiful suborbital flight and return to landing pad! 🚀
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On 4/10 1957, the Soviet Union put Sputnik, the first artificial satellite, into orbit.⠀
In this honor, we named our launch platform Sputnik.⠀
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Remember:⠀
It’s not the size of your rocket that matters, but the will to succeed.⠀
⠀
Happy new year, from all of us! 🚀
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Another weekend another milestone! 🚀 Yesterday saw the first BPM5 rocket engine coaxial swirl injector water flow tests! Fuel side only here, so it does not show proper mixing. And we need to crunch the data, but numbers coming out are stable and repeatable, which is promising!
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Usually, liquid oxygen (LOX) and rocket propellants can either make art or burnt toast. But in this case, it made both!
The exquisite interaction between brass & LOX on our coaxial swirl injector front contrasts well with its potential in presence of a combustible substance. 🚀
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Sound on to hear our engine sing! This is fuel purging after our rocket engine burn from our upcoming video looking into the recent rocket fuel injector test campaign we had during Easter. 🚀
Expect the preliminary test review video in the next few days!
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Congratulations to the entire team at SpaceX!
The near flawlessness of the operation on a second flight of such a complex vehicle is something to marvel at.
Pressure's on you now, SN10. 😉
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Our vision: The crewed Spica rocket at 50km altitude before main engine cut-off.
Learn more about our crowdfunded space program at
If you wish to help us, become a supporter & fly your name to space! 🚀
For posters like this one 👇
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If life gives you stainless steel plates, just roll & weld with it. Eventually you will have something resembling a rocket. 🚀
On a more serious note, our team learned and develop a lot while making these Spica propellant tanks. It is nice to look back to see where they started.
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91% of the internets say
@DanSTAR
will launch a baseball faster than
@smartereveryday
🚀
Find out in about 15min!
Live stream with chat: Live stream with aerial cam:
#EuRoC
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...and we have stainless steel injector flanges for our 3D printed stainless steel coaxial swirl nozzles! Gearing up to test 6 different injector configurations on our 5kN engine soon, before we populate an injector area 25 times larger than this one for Spica's 100kN engine. 🚀
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To your surprise (based on your obnoxious bets made earlier 😉) our Spica rocket propellant tanks are only off by 0.38% from one another in mass. 🚀
Watch our latest YouTube video for more updates!
Video link is in the comments below.
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Before we close off the second Spica propellant tank, fill it up with LOX and pressurize it to 20 bar, we thought we'd invite you for a virtual tour of it in good 2020 fashion. 🚀
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This day in 2012 we tested Launch Escape and parachute systems with the Tycho Deep Space Capsule. Our mannequin astronaut Rescue Randy would tell you all about the flight, but he doesn't speak.
Read about it or support our crowdfunded space program at
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THANK YOU rocket fans.
It's only because of your support that manned amateur space flight is going to be possible.
If you haven't done so already, please go to to sign for our newsletter and maybe even make a donation to the project.
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A long-overdue video update from the rocketshop just needs a few final tweaks and a readiness review before coming to your screens. Stay tuned for it! 🚀
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Ready to fly again ❤️
And - how hard can it be to retrieve the top of the rocket
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We've begun integrating Spica's liquid nitrogen vaporizer onto the test stand!
This almost-a-rocket-engine running on ethanol and LOX will act as a 500kW heater to power 2 heat exchangers with LN2 flowing through them, converting it to gas & pressurizing Spica's prop tanks. 🚀
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We have some major rocker assembling coming up! The Spica propellant tanks got their final coat of paint, John, Jørgen & Martin have finished pop nut riveting to connect them, some alignment tweaks are being done and we will soon be ready to stack them on top of each other! 🚀
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Nobody:
Us: Of course we can show you a teaser of our new ethalox rocket engine! 🚀
Here's ~3/4 of its cooling jacket!
*runs off to clean the chip tray to resume machining the rest of it*
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Have you met our new rocket engine? 🚀
Full reveal is linked in the comments. 👇
P.S. Thanks to
@Erdayastronaut
for the sound waves!
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We are rather excited and over-the-moon grateful for this nicely aged and functioning MAHO CNC mill that we got donated to us yesterday! We look forward to realizing that we now have such a machine and tuning our brains to include CNC manufacturing into our design flow. 🚀
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Here's a better look at the Spica rocket propellant tank deformation hardening after its pressure test at >30bar. The next tank is almost ready for its pressure test as well, then both will get a layer of paint and the first 5 meters of the Spica rocket will be complete! 🚀
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With each subsystem we make leading up to the BPM-100 engine, such as the recently-pressure-tested propellant tanks, BPM-100 LOX valve test rig, or the liquid nitrogen evaporator, we continue to better our weld quality for when it's time for those crucial BPM-100 engine welds. 🚀
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The business end of our crewed Spica rocket: Our bi-liquid BPM100 engine.
Regeneratively cooled and powered by ethanol and liquid oxygen it will burn nearly 50 liters (or 13 gallons) of propellants each second, producing over 100kN of thrust on its crowdfunded journey to space.🚀
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NEW VIDEO! 🚀
Our secret (nor really) ingredient for producing Spica rocket engines in house, which we greatly modified (as usual) to do that!
We hope to share some major engine developments with you in the coming months. This explains how we prepared for it.
Link in ...
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We often get asked who will become the world's first self-made astronaut when we launch Spica with a person onboard for the first time.
So meet our current crew of candidates that wish to gain those unique astronaut wings!
From left: Mads Stenfatt, Anna Olsen and Carsten Olsen.
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Rocket fans, we need your Insight! Take this Opportunity to compare our Nexø II rocket main parachute opening to Perseverance. Out of Curiosity - which one do you think opened faster? 🤔
OK, OK! No more Ingenious dad jokes, geesh! Just trying to brighten your Spirit...
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The single donation option on our website is working again! 🚀 We fixed a few issues and made the payments more secure through Stripe. For those, who have contacted us during that period, we thought we'd let you know that it is running again. Thank you!
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The injector has been changed and we’re ready to prepare for test 2
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If you were LOX, you'd call this home. That's the inside of our Spica rocket propellant tank. 🚀 The petals are anti slosh baffles, which we talked about in one of our recent videos.
In case you missed it: 📺
Photo: Martin Dyngbo
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More fire fighting equipment being tested. The engine is almost ready. We expect first burn within an hour.
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Inspired by the Soyuz Launch Escape System and the Falcon 9 rocket, we're investigating if grid fins, in combination with the ballute, could help the space capsule get more stability and spin control.
This is what it may look like.
Graphics courtesy of Stanley Creative.
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Meet our all-volunteer team that dedicates their spare time to our crowdfunded space program!
Here is Bianca Turneanu: Navigation and control systems, Stream & IT, Production.
You can help support our 🚀 mission as well, and fly your name to space! 👇
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After our successful tests of the coaxial swirl injectors with the BPM-5 engine, our booster team has been consolidating the Spica rocket's BPM-100 engine design. It's a big step up in size from our BPM-5, but we're close to making it robust, modular and simple to manufacture. 🚀
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Today, we're preparing the first experimental payload for a future Orbital Mission.
We call it Advanced Payload Re-entry Inertial Light 1.
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There's no more powerful electric rocket propellant pump that we know of than the one
@OrbitalMachines
are making for Spica and our BPM-100 rocket engine! 🚀
And they are running an equity crowdfunding campaign if you would like to become a shareholder:
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The Spica rocket propellant tank pressurization system heat exchanger (right) and its burner (small racket engine on the left) to provide heat to vaporize liquid nitrogen into pressurization gas & ensure a stable ~15bar chamber pressure of the BPM-100 rocket engine during flight.
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After seeing great results running 3D printed stainless steel coaxial swirl elements inside a BPM-5 combustion chamber, our friends
@DigitalMetal3D
wanted to push their tech & our injector design further by printing a BPM-5 injector as a single piece!
How could we say no? 🚀🤓
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Happy world aviation and cosmonautics day! 🚀
Looking back at the first human spaceflight performed 60 years ago this day, we feel inspired to continue this (almost) never-ending human journey of exploration and pioneering.
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