CS: Building Spica’s Inter-tank Section

Video Caption: Our rockets are 100% crowdfunded. Visit http://www.copsub.com/support-us to become one of our supporters! Compliment us by wearing our apparel: https://www.zazzle.com/store/copsub Book a visit for our rocket factory in Copenhagen: https://www.airbnb.com/copsub

The production of Spica – the largest crowdfunded, amateur space rocket has begun. After cutting all the parts for it on our homemade CNC plasma cutter and rolling the stainless steel hull we begin to weld all the pieces together for an inter tank section that will bridge the liquid oxygen and ethanol propellant tanks which will feed our DIY bi-liquid rocket engine. The world’s first crowdfunded crewed launch vehicle is on it’s way!

Copenhagen Suborbitals is the world’s only manned, crowdfunded space program. In the future, a volunteer astronaut will fly to space on our home-built rocket. We do this on our spare time, all the donations go to paying our workshop rent and buying materials.

We are forever thankful to each of our supporters!
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Music: “All Systems Nominal” and “Moon Dance” by Everyday Astronaut: (https://www.everydayastronaut.com)
Percussion elements by Eric Taylor: (https://twitter.com/EricTaylorF_L) “Twisted” by Kevin MacLeod (https://incompetech.com)

CS: RCS Testing

Video Caption: After numerous leak tests and sealing tape applications, Adrian finally gets to see his reaction control system work. Previous video on Adrian’s RCS power supply electronics: https://youtu.be/zvdZzvocfMA

CS: Ballute Testing

I must say the CS parachute department seems to be on the ball, good to see so much work going into recovery!

Video Caption: In an attempt to mitigate the spin we saw with our last manned Ballute jump, we made and tested a small-scale design, which is sown from two sections – top and bottom, rather than single continuous gores. This, we hope, allows better alignment of air intake pockets, which we expect caused the spin on the previous design.

Copenhagen Suborbitals is the world’s only manned, amateur space program, 100% crowdfunded and nonprofit. In the future, a volunteer will fly to space on our home-built rocket.

If you like the video and what we do in general, please go to http://www.copsub.com/support-us and support our project. Donations start from as little as a coffee a month.

CS: Saturday In The Rocketshop 07/09

Video Caption: A quick look into the workshop happenings last weekend.

A quick update on how we modify our swirl injectors to test how larger propellant holes influence their output.

Copenhagen Suborbitals is the world’s only manned, amateur space program, 100% crowdfunded and nonprofit. In the future, a volunteer will fly to space on our home-built rocket.

If you like the video and what we do in general, please go to http://www.copsub.com/support-us and support our project.

Donations start from as little as a coffee a month.

Compliment us by wearing our apparel: https://www.zazzle.com/store/copsub

CS: Swirl Injector Testing

Copenhagen Suborbitals have been continuing their testing of swirl injectors (article here), planned for there BPM-100 rocket engine, the group plan to carry out small scale tests on their BPM-5 engine.

Swirl injectors are most commonly found in Russian rocket engines and more predominantly with a liquid/gas injection scheme (coaxial swirl) where the gaseous propellant is directed down through the centre and the liquid propellant injected tangentially along the element wall, producing a swirl. This fuel swirl produces a cone at the outlet where when the oxidiser is introduced it mixes in this cone thus giving good atomisation of the propellants.

Coaxial Swirl Injector Element

As being investigated by CS, a liquid-liquid coaxial swirl injector has been used in the past with storable propellants but also with liquid oxygen and kerosene as used in the RD-0110/0107 engine which has served as an upper stage in various launch vehicles over the years.

Shear Coaxial Injector Element

The coaxial swirl injector should not be confused with a shear coaxial injector (also called a coaxial hollow post) as found in the Space Shuttle Main Engine (SSME) or RS-25. This injector element is typically used with liquid oxygen and gaseous hydrogen  (phase change after absorbing heat from the cooling jacket). The gaseous hydrogen flows at much higher velocity compared to the liquid oxygen where the differential in this velocity creates a shear action, breaking the liquid oxygen into droplets, hence the name. This injector does not work well with both propellants being liquids as the pressure drop required to achieve the high velocity would become too great.

You can find more info on swirl injectors below or in any liquid rocket book,
Swirl Coaxial Injector Development
Swirl Effect on Coaxial Injector Optimisation
History of Liquid Propellant Rocket Engines in Russia
Combustion Characteristics of Bi-liquid Swirl Coaxial Injectors with Respect to a Recess